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Rare-earth magnesium alloy solidification process comparison heat analysis method

A rare earth magnesium and thermal analysis technology, applied in the field of material science, can solve the problems of affecting the measurement results, not being able to track the solidification process of the magnesium alloy throughout the process, and damaging the measuring instrument, etc., to achieve the effect of accurate measurement

Inactive Publication Date: 2008-11-19
厦门火炬特种金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two conventional thermal analysis instruments are not suitable for the study of the solidification process of magnesium alloys.
The reason is that once the magnesium alloy sample exceeds 500°C, the sample will burn violently in the instrument, which will affect the measurement results if it is light, and damage the precious measuring instrument if it is serious
Therefore, the thermal analysis of magnesium alloys provided by the current thermal analysis laboratory does not exceed 450°C, and the solidification process of magnesium alloys cannot be tracked throughout the process.
In addition, after the addition of rare earth elements to magnesium alloys, the exothermic peaks of the new phases sometimes overlap with the exothermic peaks of the phases that do not contain rare earth alloys, making it impossible to distinguish

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 Shown is a schematic diagram of the thermal precipitation device for the determination of rare earth magnesium alloys of the present invention. Mixed gas (SF 6 +CO 2 ) The air intake pipe 1 stretches into the resistance furnace 3 through the furnace cover 7, and the volume flow ratio of the mixed gas is SF 6 :CO 2 =1:100, air pressure is 0.3Kg / cm 2 One end of the nickel-chromium-nickel-silicon thermocouple wire 2 is connected with the computer terminal 10, and the other end is stretched into the crucible 5 and 8, the both sides inner wall of the resistance furnace 3 is provided with a resistance wire 4, and the inside of the resistance furnace 3 is placed with a crucible 5 And 8, one end of the thermocouple 6 is connected to the power supply, and the other end is fixed above the central heat insulating layer 9 in the resistance furnace 3 through the furnace cover 7 .

[0029] Put ZA52Nd1 alloy and ZA52 alloy (each 200g, see attached table 1 for com...

Embodiment 2

[0033] Put ZA52Nd2 alloy and ZA52 alloy (200g each, see attached table 1 for composition), respectively into small iron crucibles 5 and 8 of the same size, and heat them in a resistance furnace until melting. The heating and cooling process is in (SF 6 +CO 2 ) under the protection of mixed gas, the volume flow ratio of the mixed gas is SF 6 :CO 2 =1.2:98, air pressure is 1.0Kg / cm 2 When the samples in the two crucibles are completely melted and converge to 720°C, the resistance furnace is powered off, the melts in crucibles 5 and 8 are cooled with the furnace, and the cooling temperature is recorded every 0.05 seconds. Subtract the temperature of the ZA52 sample from the solidification cooling temperature of the ZA52Nd2 sample at the same time, and draw a curve with the solidification cooling temperature as the horizontal axis and the temperature difference as the vertical axis. The peak of the curve appears in the temperature range of 551°C to 565°C. With the identificatio...

Embodiment 3

[0035] Put ZA52Nd4 alloy and ZA52 alloy (200g each, see attached table 1 for composition), respectively into small iron crucibles 5 and 8 of the same size, and heat them in a resistance furnace until melting. The heating and cooling process is in (SF 6 +CO 2 ) under the protection of mixed gas, the volume flow ratio of the mixed gas is SF 6 :CO2 =1.2:100, air pressure is 0.7Kg / cm 2 When the samples in the two crucibles are completely melted and converge to 720°C, the resistance furnace is powered off, the melts in crucibles 5 and 8 are cooled with the furnace, and the cooling temperature is recorded every 0.05 seconds. Subtract the temperature of the ZA52 sample from the solidification cooling temperature of the ZA52Nd4 sample at the same time, and draw a curve with the solidification cooling temperature as the horizontal axis and the temperature difference as the vertical axis. The peak of the curve appears in the temperature range of 554°C to 562°C. With the identification...

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Abstract

The invention relates to a rare earth magnesium alloy solidification process comparison and thermal analysis method, which comprises the following steps that: (1) a rare earth magnesium alloy (ZA52-xNd, x=1, 2, 4, 6) and a reference magnesium alloy (ZA52) are put into crucibles having the same size respectively; (2) each alloy is heated in a resistance furnace to be melted, the heating and cooling processes are implemented under the protection of (SF6+CO2) mixed gases until samples in the two crucibles are melted thoroughly and the temperature approaches 720 DEG C; and (3) the power of the resistance furnace is turned off, and fused masses in the crucibles are cooled along with the furnace; and the cooling temperature is recorded every 0.05 second, and solidification cooling curves of the samples to be detected and reference samples are obtained through the corresponding software processing. The method in the invention can accurately measure the rare earth magnesium alloy new phase formation temperature range and is practical.

Description

technical field [0001] The invention relates to a method for comparative heat analysis of a rare earth magnesium alloy solidification process, which belongs to the field of material science. Background technique [0002] Rare earth elements can significantly improve the mechanical properties and corrosion resistance of magnesium alloys, among which the strengthening effect of Nd and Y is particularly significant. The strengthening effect of rare earth elements on magnesium alloys is mainly due to the strengthening effect of rare earth precipitates. During the solidification process of the alloy, the rare earth phase generally begins to form at a relatively high temperature, and their formation temperature exceeds 500 °C. [0003] Due to the very active chemical properties of magnesium, it is very easy to react with other elements at room temperature. Magnesium can even react with N in the air at high temperatures. 2 The reaction produces Mg 3 N 2 . Therefore, the extrem...

Claims

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Application Information

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IPC IPC(8): G01N25/06G01N25/02
Inventor 邹宏辉李德富马志新沈健
Owner 厦门火炬特种金属材料有限公司
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