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Semisolid isothermal treatment method of Ti-based blocky amorphous composite

An amorphous composite material and isothermal treatment technology, which is applied in the field of microstructure and mechanical properties of titanium-based amorphous composite materials, can solve the problems of unevenness, small distribution of dendrites, different cooling rates, etc., and achieves simple process and convenient operation. , the effect of improving plasticity

Inactive Publication Date: 2017-09-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ti 48 Zr 18 V 12 Cu 5 be 17 Bulk amorphous alloy is a bulk amorphous composite material with second-phase dendrites obtained by copper mold suction casting, but due to the different cooling rates during the forming process, the dendrites are small and unevenly distributed
Therefore, compared with amorphous alloys, although the plasticity has been improved to a certain extent, the increase is too small to meet the industrial needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mass of each element of Ti, Zr, V, Cu, and Be calculated by the mass ratio is 9.1504g, 6.5395g, 2.4345g, 1.2655g, and 0.6101g, respectively. Grind with sandpaper to remove oxides on the surface, and then use ultrasonic cleaning. Put the processed raw materials into the electric arc melting furnace, and vacuumize the melting furnace. The vacuum degree is 1.0×10-3Pa. If it exceeds 450A, after the initial smelting, turn the alloy ingot 180° to continue smelting, and add magnetic stirring after multiple smelting to ensure the uniformity of each material in the alloy. Suction cast the smelted alloy ingot to obtain Ti with a diameter of 3mm 48 Zr 18 V 12 Cu 5 be 17 bulk amorphous composites. The bulk amorphous composite material is packaged in a vacuum quartz tube and subjected to semi-solid isothermal treatment. Before heat preservation, the resistance furnace is preheated to ensure the uniformity of temperature, heated to 200°C with rated power for 2 hours, then ...

Embodiment 2

[0025] The process conditions are the same as those in Example 1. A bulk amorphous composite material with a diameter of 3 mm is obtained. At 860° C., the samples are kept for different times, namely 1 min, 3 min, 5 min, 10 min, 20 min, and 40 min. According to the analysis by optical microscope, at 860°C, after semi-solid isothermal treatment, the β-Ti crystal phases melted into each other to form large grains, and the second phase grains also increased with time, and the shape It also gradually changed from dendrite to spherulite, and reached the best when it was kept warm for 10 minutes, and then changed to dendrite again, and no new phase was formed. This shows that: Ti48Zr18V12Cu 5 be 17 Semi-solid isothermal treatment of bulk amorphous composites at 860 °C can obtain a β-Ti crystal phase with a higher degree of spheroidization, which makes the material shape better.

Embodiment 3

[0027] The process conditions are the same as those in Example 1, and a bulk amorphous composite material with a diameter of 3 mm is obtained, which is kept at 760° C. for 3 min and 30 min. Before heat preservation, the resistance furnace needs to be preheated to ensure the uniformity of temperature, heated to 200°C with rated power for 2 hours, then heated to 500°C for 2 hours, and finally heated to 760°C for 2 hours. After isothermal treatment, the quartz tube was cooled in 6% NaCl aqueous solution. Compression experiments at room temperature were carried out on the processed samples on the RG-20 million energetic material testing machine (MTS). The experimental results showed that compared with the as-cast samples, the plasticity of the samples increased after the semi-solid isothermal treatment at 760°C for 3 minutes. By 20%, the breaking strength decreased by about 10%. Although the fracture strength of the sample after semi-solid isothermal treatment at 760°C for 30 min...

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Abstract

The invention provides a semisolid isothermal treatment method of a Ti-based blocky amorphous composite. The semisolid isothermal treatment method comprises the following steps: 1, preparing the Ti-based blocky amorphous composite; 2, first, removing dirt on the surface of the prepared blocky amorphous composite by using a physical method, and after washing clean by using ultrasonic waves, carrying out sealing by using a vacuum quartz tube; 3, placing the sealed blocky amorphous sample in a chamber electric furnace to carry out semisolid isothermal treatment; and 4, rapidly taking out the quartz tube which is preserved at preset temperature for preset time, and placing the quartz tube in a 6% NaCl solution to carry out cooling. The technical method is simple, is convenient to operate, protects the environment, saves energy, obviously improves the plasticity of the amorphous composite subjected to isothermal treatment and belongs to one novel amorphous alloy plastifying method.

Description

technical field [0001] The invention belongs to the technical field of material preparation technology, and relates to a process control method for the microstructure and mechanical properties of titanium-based amorphous composite materials. Background technique [0002] Compared with crystalline alloys, amorphous alloys have a structure of long-range disorder and short-range vacancy order, so they have a series of excellent properties, such as high strength, high hardness, good wear resistance and corrosion resistance These excellent properties make amorphous composite materials have the potential to become new materials, which has attracted the attention of many researchers. However, when loaded at room temperature, due to the rapid expansion of very localized shear bands, the shear layer softens due to adiabatic heating and brittle fracture occurs, and almost all amorphous alloys exhibit brittle fracture. In order to solve this bottleneck problem, researchers have develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C1/00
CPCC22F1/183C22C1/11
Inventor 杨湘杰熊姣郭洪民
Owner NANCHANG UNIV