A device and method for synchrotron radiation imaging of metal solidification under the action of an external physical field

Abstract

The present invention provides a device and method for synchrotron radiation imaging of metal solidification under the action of an external physical field, the device comprising a heating furnace, a quartz crucible, a pulsed electric field device, a magnetic field device and an ultrasonic field device, the quartz crucible being arranged in the heating furnace, and the quartz crucible being able to simultaneously apply three external physical fields, namely, an ultrasonic field, an electric field and a magnetic field. The device structure of the present invention is relatively simple, greatly simplifies the cost and complexity of the experimental device, effectively reduces the volume of the device, and the present invention can realize the composite action of the ultrasonic field, the electric field and the magnetic field.

Description

Technical Field

[0001] The present invention relates to the technical field of metal solidification synchrotron radiation imaging, and in particular to a device and method for metal solidification synchrotron radiation imaging under the action of an external physical field. Background Art

[0002] The solidification process of metal alloys is a series of complex physical processes including heat, solute, momentum transport in the macroscopic scope and grain nucleation and dendrite growth in the microscopic scope. Among them, convection plays an important role in alloy solidification. It causes remelting at the root of dendrites in the long-range transport of convection, solute, momentum and the force on dendrites, which has a significant effect on dendrite growth and microstructure. Due to the opaque, micro-nano and high-temperature characteristics of metal solidification process, it is difficult to observe the dynamic information such as convection, solute diffusion, energy transport, dendrite growth rate, nucleation mode, etc. in the metal solidification process under the action of external field, which restricts the regulation and influence mechanism of external field on solidification microstructure.

[0003] The emergence of synchrotron radiation X-ray in-situ imaging technology has made it possible to explore the mechanism of action of external physical fields on metal solidification structures. The experimental device and method of alloy solidification under the action of physical fields play a vital role in imaging effects and experimental data. However, most of the current synchrotron radiation imaging of alloy solidification uses encapsulated crucibles. The encapsulation steps and methods are complicated and cumbersome, and it is difficult to apply ultrasonic and electric fields. So far, there have been no reports on experimental devices and methods for synchrotron radiation imaging of metal solidification under the combined action of ultrasonic, electric and magnetic fields.

[0004] Chinese patent CN110082372A discloses a portable synchrotron radiation state in-situ imaging experimental solidification device, which is characterized by better metal safety, lighter weight, and better sealing effect. However, this experimental method can only perform conventional metal solidification synchrotron radiation in-situ observation, and cannot apply external physical fields. Due to portability, the amount of melt and each component are relatively small, making it difficult to conduct complex synchrotron radiation in-situ experiments.

[0005] Therefore, it is necessary to provide a new external physical field metal solidification synchrotron radiation imaging device and method that can meet the requirements of simultaneously applying pulse current with a large current density, traveling wave magnetic field, external ultrasonic waves, etc. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a synchrotron radiation imaging device and method for metal solidification under the action of an external physical field which is simple in structure and easy to implement.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A synchrotron radiation imaging device for metal solidification under the action of an external physical field comprises a heating furnace, a quartz crucible, a pulsed electric field device, a magnetic field device and an ultrasonic field device. The quartz crucible is arranged in the heating furnace and can simultaneously apply three external physical fields: ultrasonic field, electric field and magnetic field.

[0009] Optionally, the pulse electric field device includes a high-frequency pulse power supply, a consumable electrode, an upper electrode clamp, a copper rod, and a lower electrode clamp. The consumable electrode is fixed to the upper wall of the quartz crucible through the upper electrode clamp and immersed in the melt. The copper rod is connected to the lower electrode clamp as another electrode. One end of the upper electrode clamp is connected to the pulse power supply. The upper electrode clamp, consumable electrode, melt, and copper rod form a current path. When the high-frequency pulse power supply is turned on, the pulse current flows through the melt from the vertical direction.

[0010] Optionally, the magnetic field device includes a high-frequency pulse power supply and an electromagnetic coil, and a uniform pulse electromagnetic field is formed around the Cramer winding in the flat area in the middle of the quartz crucible, and the electromagnetic stirring force generated by electromagnetic induction is used to electromagnetically stir the melt.

[0011] Optionally, the ultrasonic field device includes a high-frequency pulse power supply, an ultrasonic generator, an ultrasonic transducer, and an ultrasonic radiation rod. The high-frequency pulse power supply is connected to the ultrasonic generator. The ultrasonic generator converts the pulse current into ultrasonic vibration through the piezoelectric ceramic or magnetostrictive coil in the ultrasonic transducer, and the ultrasonic vibration is introduced into the melt through the ultrasonic radiation rod.

[0012] Optionally, the quartz crucible is a dumbbell-shaped thin-walled transparent crucible, the cylindrical parts at both ends of the quartz crucible have the same diameter, the bottom of the quartz crucible is tightly bonded to a cylindrical copper rod, and the bottom of the crucible is sealed and fixed by the copper rod, and there is a flat channel with a thickness of 0.2-0.5 mm in the middle of the quartz crucible.

[0013] Optionally, the metal solidification synchrotron radiation imaging device under the action of the external physical field also includes a temperature measuring device, which includes a platinum-rhodium thermocouple wire and a multi-channel circulating temperature measuring instrument connected to the platinum-rhodium thermocouple wire, and the platinum-rhodium thermocouple wire is used to measure the melt temperature, and the diameter of the platinum-rhodium thermocouple wire is 0.1-0.2mm.

[0014] Optionally, the synchrotron radiation imaging device for metal solidification under the action of the external physical field also includes a temperature control device, which includes an insulation layer and a water cooling device arranged outside the heating furnace, and the water cooling device includes a water inlet and a water outlet of the heating furnace, a water cooling outlet and a water cooling inlet of the ultrasonic transducer, the water inlet of the heating furnace is connected in parallel with the water cooling inlet of the ultrasonic transducer, and the water outlet of the heating furnace is connected in parallel with the water outlet of the ultrasonic transducer, both water inlets are connected to the water supply device through a hot water-resistant pipe, and the water outlets lead to a water tank.

[0015] Optionally, the synchrotron radiation imaging device for metal solidification under the action of an external physical field further includes a gas protection device for preventing oxidation of the melt during the experiment, and the gas protection device is an argon protection device.

[0016] Furthermore, the present invention also provides a method for synchrotron radiation imaging of metal solidification under the action of an external physical field, the method comprising the following steps:

[0017] Open the fixing cover of the ultrasonic device, put the sample into the quartz crucible, adjust the upper electrode clamp to fix the consumable electrode on the quartz crucible, and cover the fixing cover of the ultrasonic device;

[0018] Turn on the power of the heating furnace and heat the placed sample until the sample melts;

[0019] After the sample is melted and kept warm for a period of time, the fixed cover of the ultrasonic device is opened, and the melting temperature of the sample is obtained by connecting the multi-channel circuit temperature measuring instrument through the platinum-rhodium thermocouple wire;

[0020] After the temperature displayed by the multi-channel circulatory temperature measuring instrument reaches the ultrasonic treatment temperature, the temperature is kept constant, the system positioning platform is adjusted, and the ultrasonic radiation rod is extended into the heating furnace;

[0021] Turn on the pulse power supply, and start the ultrasonic field device, magnetic field device and pulse electric field device at the same time to conduct multi-physics field coupling experiments;

[0022] The synchrotron radiation source is projected onto the sample through the light entrance, and the outgoing light carrying the sample information is received by the parallel CCD detector to form a clear phase contrast image.

[0023] Optionally, the step of obtaining the melting temperature of the sample by connecting a platinum-rhodium thermocouple wire to a multi-channel circuit thermometer specifically includes: extending the platinum-rhodium thermocouple wire probe from the thermocouple fixing hole to a specified position in the melt, then fixing the thermocouple wire by a nut on the fixing cover, and connecting the other end of the thermocouple wire to the multi-channel circuit thermometer.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] (1) The pulse current, pulse magnetic field, and ultrasonic wave of the present invention can use the same set of pulse power supply, which greatly simplifies the cost and complexity of the experimental device and effectively reduces the size of the device.

[0026] (2) The current of the present invention uses a copper rod to directly extend into the melt, which can achieve a larger current density than other inventions, and the pulse current will produce stronger Lorentz force, magnetostrictive force and shock wave than the commonly used direct current, which helps to further understand the mechanism of the influence of pulse current on the solidification process of metal melt.

[0027] (3) The magnetic field of the present invention uses a pulsed electromagnetic field. Different from a static magnetic field, the electromagnetic stirring force generated by the pulsed electromagnetic field can cause forced convection in the melt, promote dendrite fracture, and reduce segregation.

[0028] (4) The ultrasonic field of the present invention is directly introduced into the melt through the ultrasonic radiation rod, and the solidification process of the metal under the acoustic streaming effect and acoustic cavitation effect caused by the ultrasonic action can be directly observed.

[0029] (5) Melt temperature is measured using platinum-rhodium thermocouple wires, which have high measurement accuracy and a wide measurement range. At the same time, the diameter is thin enough to directly measure the temperature near the synchrotron radiation observation point.

[0030] (6) The specially made quartz crucible in the present invention can realize the simultaneous application of three physical fields: ultrasonic field, electric field, and magnetic field, and the flat channel in the middle can ensure a high quality of synchrotron radiation imaging.

[0031] (7) The two sets of water cooling systems and gas protection devices of the present invention can prevent the experimental device from overheating, and can also quickly adjust the temperature rise and fall of the sample, conveniently adjust the temperature gradient, and prevent oxidation of the sample during melting under the protection of inert gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 A schematic diagram of the structure of a synchrotron radiation imaging device for metal solidification under the action of an external physical field provided by an embodiment of the present invention;

[0034] Figure 2 A partially enlarged front view of a quartz crucible in a synchrotron radiation imaging device for metal solidification under the action of an external physical field provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a pulse power supply and a temperature control system of a metal solidification synchrotron radiation imaging device under an external physical field provided by an embodiment of the present invention;

[0036] Figure 4 A flowchart of a method for synchrotron radiation imaging of metal solidification under an external physical field provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] Figure 1 FIG. 1 is a schematic diagram of the structure of a synchrotron radiation imaging device for metal solidification under the action of an external physical field provided by an embodiment of the present invention. Figure 2 A partially enlarged front view of a quartz crucible in a synchrotron radiation imaging device for metal solidification under an applied physical field provided by an embodiment of the present invention, Figure 3 A schematic diagram of a pulse power supply and a temperature control system for a metal solidification synchrotron radiation imaging device under an external physical field provided by an embodiment of the present invention is shown in FIG. Figure 1 , Figure 2 , Figure 3 As shown, the device includes a heating furnace, a quartz crucible, a pulsed electric field device, a magnetic field device, an ultrasonic field device, a temperature measuring device, a temperature control device, a water cooling device and a gas protection device. In this embodiment, the gas protection device is an argon protection device 4, which uses inert gas argon for gas protection.

[0039] An ultrasonic device fixing cover 13 is provided on the upper part of the heating furnace 6. The cover is of stepped design, and an annular sealing ring is embedded in the middle. After the ultrasonic device fixing cover 13 is covered, it is fixed to the device body by screws to achieve the sealing of the heating furnace 6. Light inlet 7 and light outlet 16 are provided at both ends of the heating furnace 6. The light inlet 7 and the light outlet 16 are sealed with heat-resistant transparent parts. The argon protection device 4 on the ultrasonic device fixing cover 13 realizes gas protection in the entire heating furnace to prevent the melt from being oxidized during the experiment.

[0040] The temperature measuring device includes a multi-channel itinerant temperature measuring instrument 31 for negative feedback regulation in the heating furnace and a platinum-rhodium thermocouple wire 23 extending into the melt. The multi-channel itinerant temperature measuring instrument 31 displays the measured temperature through an LED, and the temperature measuring device is connected to the temperature control device 30, and the temperature in the furnace reaches and stabilizes at the set temperature through negative feedback regulation. For melt temperature measurement, the platinum-rhodium thermocouple wire can be reasonably arranged according to the position to be measured and the number of temperature measurement points, and the diameter of the platinum-rhodium thermocouple wire is 0.1-0.3mm.

[0041] The water cooling device includes a water cooling outlet 2 and a water cooling inlet 3 of the ultrasonic transducer 1, a water cooling outlet 15 and a water inlet 17 of the heating furnace 6, and a surrounding water cooling channel is embedded in the heating furnace 6. The water inlet of the heating furnace 6 is connected in parallel with the water cooling inlet of the ultrasonic transducer 1, and the water outlet of the heating furnace 6 is connected in parallel with the water outlet of the ultrasonic transducer 1. The cooling water is introduced into the water cooling inlet 3 of the ultrasonic transducer 1 and the water inlet 17 of the heating furnace 6 through a water pump through a hot water-resistant pipe, and the water outlet is led out to the water tank where the water pump is located through a heat-resistant pipe, forming a complete water circulation cooling system.

[0042] The outside of the heating furnace 6 is provided with a thicker insulation layer 5 to prevent the temperature from diffusing outward. The platinum-rhodium thermocouple wire 23 is connected to a multi-channel circuit temperature measuring instrument 31 for real-time monitoring of the melt temperature. The temperature control device 30 controls the temperature by adjusting the water cooling device and the heating device inside the heating furnace to increase or decrease the temperature of the chamber.

[0043] The special quartz crucible 21 is a dumbbell-shaped thin-walled transparent crucible. The dumbbell-shaped design is to ensure that there is enough space above for ultrasonic treatment of the melt and pulse current treatment in the vertical direction. At the same time, the flat area in the middle makes the synchronous X-ray imaging clearer, and improves the success rate of in-situ observation of the evolution of metal microstructures under the action of multiple physical fields. There is a flat channel with a thickness of 0.2-0.5mm in the middle of the quartz crucible 21. If it is less than 0.2mm, the accurate temperature of the flat area in the middle cannot be measured by the thermocouple wire, and if it is greater than 0.5mm, it will affect the quality of synchrotron radiation imaging. The cylindrical parts at both ends of the quartz crucible 21 have the same diameter. In order to ensure better ultrasonic radiation quality, the diameter of the cylindrical part is 3-5 times the diameter of the ultrasonic radiation rod. Its bottom is tightly bonded to the cylindrical copper rod 8 to ensure that the aluminum liquid will not leak from the bottom when heated to 850°C in the experiment. The bottom of the copper rod 8 is connected to the sample table 9, and the bottom is sealed and fixed by the copper rod 8. The sample stage 9 is connected to the height adjustment device 11 and the base 12 through the screw rod 10, so that the sample stage can be moved up and down. In addition, the copper rod 8 also serves as the lower electrode in the pulse electric field, and the copper rod 8 is connected to one end of the high-frequency pulse power supply 28 using a wire. An upper electrode clamp 20 is bonded to the upper part of the quartz crucible 21, and the upper electrode clamp 20 is bonded to the upper part of the quartz crucible 21 so that the consumable electrode 19 can be fixed vertically against the wall, so as to leave as much space as possible to arrange the platinum-rhodium thermocouple wire 23 and the ultrasonic radiation rod 18. The consumable electrode 19 is fixed by the upper electrode clamp 20 so that it is immersed in the melt 22 by about 10 mm, ensuring that the consumable electrode 19 is in good contact with the melt. The tail end of the upper electrode clamp 20 is connected to the other end of the pulse power supply 28. The upper electrode clamp 20, the consumable electrode 19, the melt 22, and the copper rod 8 form a passage, which can realize a DC electric field and a pulse electric field of a current density. At the same time, by adjusting the depth of the consumable electrode 19, the dendrite movement caused by gravity during the solidification process can be prevented from affecting the electrode contact.

[0044] The pulse electric field device includes a high-frequency pulse power supply 28, a transformer 27, a consumable electrode 19, an upper electrode clamp 20, and a lower electrode clamp 25. The consumable electrode 19 is fixed to the upper wall of the quartz crucible 21 through the upper electrode clamp 20 and immersed in the melt by about 10 mm. The copper rod 8 below plays a sealing role and is connected to the lower electrode clamp 25 as another electrode. When the high-frequency pulse power supply is turned on, the pulse current flows through the melt in the vertical direction, generating a stable pulse electric field in the observation area in the middle of the crucible.

[0045] The magnetic field device includes a high-frequency pulse power supply 28 and an electromagnetic coil 24, and a Cramer-type winding is wound around the flat area in the middle of the quartz crucible 21 to form a uniform traveling wave magnetic field. Since the Cramer-type winding is wound around the flat area in the middle, the distance between the Cramer-type winding and the wall of the quartz crucible is kept the same as much as possible. When arranging the winding, avoid the light inlet and light outlet, and the pitch is greater than the diameter of the synchrotron radiation spot to avoid blocking the synchrotron radiation light.

[0046] The ultrasonic field device includes a high-frequency pulse power supply 28, an ultrasonic transducer 1, and an ultrasonic radiation rod 18. The flange of the ultrasonic transducer 1 is fixed to the ultrasonic device fixing cover 13 by screws, the pulse power supply 28 and the ultrasonic transducer 1 are turned on, and the ultrasonic generator converts the pulse current into ultrasonic vibration through the piezoelectric ceramic or magnetostrictive coil in the ultrasonic transducer 1, and the ultrasonic vibration is introduced into the melt through the ultrasonic radiation rod 18.

[0047] Figure 4 A flowchart of a synchrotron radiation method for metal solidification under an external physical field provided in an embodiment of the present invention is shown in FIG. Figure 4 As shown, the method comprises the following steps:

[0048] S1: Open the fixing cover of the ultrasonic device, put the sample into the quartz crucible, adjust the upper electrode clamp to fix the consumable electrode in the quartz crucible, and cover the fixing cover of the ultrasonic device;

[0049] S2: Turn on the power of the heating furnace and heat the placed sample until the sample melts;

[0050] S3: After the sample is melted and kept warm for a period of time, the fixed cover of the ultrasonic device is opened, and the melting temperature of the sample is obtained by connecting the multi-channel circuit temperature measuring instrument through the platinum-rhodium thermocouple wire;

[0051] Specifically, a platinum-rhodium thermocouple wire probe is inserted from the thermocouple fixing hole 14 into a designated position in the melt 22 , and then the thermocouple wire is fixed by a nut on the fixing cover, and the other end of the thermocouple wire is connected to the multi-channel itinerant temperature measuring instrument 31 .

[0052] S4: After the temperature displayed by the multi-channel circulating temperature measuring instrument reaches the ultrasonic treatment temperature, the temperature is kept constant, the system positioning platform is adjusted, and the ultrasonic radiation rod is extended into the heating furnace;

[0053] S5: Turn on the pulse power supply, and start the ultrasonic field device, magnetic field device and pulse electric field device at the same time to carry out multi-physics field coupling experiment;

[0054] S6: The synchrotron radiation source is projected onto the sample through the light entrance. The outgoing light carrying the sample information is received by the parallel CCD detector to form a clear phase contrast image.

[0055] Compared with the prior art, the present invention realizes the multi-physical field coupling of pulsed electric field, magnetic field and ultrasonic field for metal solidification synchrotron radiation imaging, which effectively solves the current situation that there is no such thing as a synchrotron radiation imaging device and method for metal solidification under multi-field coupling, especially the coupling of ultrasonic field with other physical fields.

[0056] The advantages of the present invention are as follows:

[0057] (1) The pulse current, pulse magnetic field, and ultrasonic wave of the present invention can use the same set of pulse power supply, which greatly simplifies the cost and complexity of the experimental device and effectively reduces the size of the device.

[0058] (2) The current of the present invention uses a copper rod to directly extend into the melt, which can achieve a larger current density than other inventions, and the pulse current will produce stronger Lorentz force, magnetostrictive force and shock wave than the commonly used direct current, which helps to further understand the mechanism of the influence of pulse current on the solidification process of metal melt.

[0059] (3) The magnetic field of the present invention uses a pulsed electromagnetic field. Different from a static magnetic field, the electromagnetic stirring force generated by the pulsed electromagnetic field can cause forced convection in the melt, promote dendrite fracture, and reduce segregation.

[0060] (4) The ultrasonic field of the present invention is directly introduced into the melt through the ultrasonic radiation rod, and the solidification process of the metal under the acoustic streaming effect and acoustic cavitation effect caused by the ultrasonic action can be directly observed.

[0061] (5) Melt temperature is measured using platinum-rhodium thermocouple wires, which have high measurement accuracy and a wide measurement range. At the same time, the diameter is thin enough to directly measure the temperature near the synchrotron radiation observation point.

[0062] (6) The specially made quartz crucible in the present invention can realize the simultaneous application of three physical fields: ultrasonic field, electric field, and magnetic field, and the flat channel in the middle can ensure a high quality of synchrotron radiation imaging.

[0063] (7) The two sets of water cooling systems and gas protection devices of the present invention can prevent the experimental device from overheating, and can also quickly adjust the temperature rise and fall of the sample, conveniently adjust the temperature gradient, and prevent oxidation of the sample during melting under the protection of inert gas.

[0064] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A synchrotron radiation imaging device for metal solidification under the action of an external physical field, It is characterized in that The device includes a heating furnace, a quartz crucible, a pulse electric field device, a magnetic field device and an ultrasonic field device. The quartz crucible is arranged in the heating furnace. The quartz crucible can realize the simultaneous application of three external physical fields, namely, ultrasonic field, electric field and magnetic field. The pulse electric field device includes a high-frequency pulse power supply, a consumable electrode, an upper electrode clamp, a copper rod and a lower electrode clamp. The consumable electrode is fixed to the upper wall of the quartz crucible through the upper electrode clamp and immersed in the melt. The copper rod is connected to the lower electrode clamp as another electrode. One end of the upper electrode clamp is connected to the pulse power supply. The upper electrode clamp, the consumable electrode, the melt and the copper rod form a current path. When the high-frequency pulse power supply is turned on, the pulse current flows through the melt from the vertical direction; the magnetic field device includes a high-frequency pulse power supply and an electromagnetic coil, which surrounds the Cram-type winding in the flat area in the middle of the quartz crucible to form a uniform pulse electromagnetic field, and uses the electromagnetic stirring force generated by electromagnetic induction to electromagnetically stir the melt; the quartz crucible is a dumbbell-shaped thin-walled transparent crucible, the cylindrical parts at both ends of the quartz crucible have the same diameter, the bottom of the quartz crucible is tightly bonded to a cylindrical copper rod, and the bottom of the crucible is sealed and fixed by the copper rod, and there is a flat channel with a thickness of 0.2-0.5mm in the middle of the quartz crucible.

2. The synchrotron radiation imaging device for metal solidification under the action of an external physical field according to claim 1, It is characterized in that The ultrasonic field device includes a high-frequency pulse power supply, an ultrasonic generator, an ultrasonic transducer, and an ultrasonic radiation rod. The high-frequency pulse power supply is connected to the ultrasonic generator. The ultrasonic generator converts the pulse current into ultrasonic vibration through the piezoelectric ceramic or magnetostrictive coil in the ultrasonic transducer, and the ultrasonic vibration is introduced into the melt through the ultrasonic radiation rod.

3. The synchrotron radiation imaging device for metal solidification under the action of an external physical field according to claim 2, It is characterized in that The metal solidification synchrotron radiation imaging device under the action of an external physical field also includes a temperature measuring device, which includes a platinum-rhodium thermocouple wire and a multi-channel circulating temperature measuring instrument connected to the platinum-rhodium thermocouple wire. The platinum-rhodium thermocouple wire is used to measure the melt temperature, and the diameter of the platinum-rhodium thermocouple wire is 0.1-0.2 mm.

4. The synchrotron radiation imaging device for metal solidification under the action of an external physical field according to claim 1, It is characterized in that The metal solidification synchrotron radiation imaging device under the action of an external physical field also includes a temperature control device, which includes an insulation layer and a water cooling device arranged outside the heating furnace, and the water cooling device includes a water inlet and a water outlet of the heating furnace, a water cooling outlet and a water cooling inlet of the ultrasonic transducer, the water inlet of the heating furnace is connected in parallel with the water cooling inlet of the ultrasonic transducer, and the water outlet of the heating furnace is connected in parallel with the water outlet of the ultrasonic transducer, both water inlets are connected to the water supply device through a hot water-resistant pipe, and the water outlets lead to a water tank.

5. The synchrotron radiation imaging device for metal solidification under the action of an external physical field according to claim 1, It is characterized in that The metal solidification synchrotron radiation imaging device under the action of an external physical field also includes a gas protection device for preventing the melt from being oxidized during the experiment, and the gas protection device is an argon protection device.

6. A method for synchrotron radiation imaging of metal solidification under the action of an external physical field. It is characterized in that The method is implemented based on the metal solidification synchrotron radiation imaging device under the action of an external physical field as described in claim 3, and comprises the following steps: Open the fixing cover of the ultrasonic device, put the sample into the quartz crucible, adjust the upper electrode clamp to fix the consumable electrode on the quartz crucible, and cover the fixing cover of the ultrasonic device; Turn on the power of the heating furnace and heat the placed sample until the sample melts; After the sample is melted and kept warm for a period of time, the fixed cover of the ultrasonic device is opened, and the melting temperature of the sample is obtained by connecting the multi-channel circuit temperature measuring instrument through the platinum-rhodium thermocouple wire; After the temperature displayed by the multi-channel circulatory temperature measuring instrument reaches the ultrasonic treatment temperature, the temperature is kept constant, the system positioning platform is adjusted, and the ultrasonic radiation rod is extended into the heating furnace; Turn on the pulse power supply, and start the ultrasonic field device, magnetic field device and pulse electric field device at the same time to conduct multi-physics field coupling experiments; The synchrotron radiation source is projected onto the sample through the light entrance, and the outgoing light carrying the sample information is received by the parallel CCD detector to form a clear phase contrast image.

7. The method for synchrotron radiation imaging of metal solidification under the action of an external physical field according to claim 6, It is characterized in that The step of obtaining the melting temperature of the sample by connecting the platinum-rhodium thermocouple wire to a multi-channel circuit temperature measuring instrument specifically includes: extending the platinum-rhodium thermocouple wire probe from the thermocouple fixing hole to a specified position in the melt, then fixing the thermocouple wire by a nut on a fixing cover, and connecting the other end of the thermocouple wire to the multi-channel circuit temperature measuring instrument.

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