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An isothermal heat treatment and high-entropy alloy technology, applied in the field of alloys, can solve the problems of high porosity, low plasticity of high-entropy alloys, uneven composition, etc., and achieve the effects of improving alloy performance, low cost and simple process
Active Publication Date: 2022-03-22
EAST CHINA JIAOTONG UNIVERSITY
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However, defects such as coarse dendrite structure, uneven composition and high porosity are prone to occur in cast high-entropy alloys, which makes the plasticity of high-entropy alloys low, making it difficult to plastically defo
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Embodiment 1
[0033] This embodiment provides a high-entropy alloy isothermal heat treatment method, comprising the following steps:
[0034] S1, the high entropy alloy Al 15 Mg 45 Li 39 Ca 0.5 Si 0.5 Place in a box-type resistance furnace, and use No. 5 flux to cover the high-entropy alloy, and pass through argon protection;
[0035] S2. At a temperature of 420°C, heat treatment isothermally for 16 minutes, 18 minutes, 20 minutes and 22 minutes respectively;
[0036] S3, then the high-entropy alloy Al after isothermal heat treatment 15 Mg 45 Li 39 Ca 0.5 Si 0.5 Put into water for water quenching treatment.
Embodiment 2
[0038] This embodiment provides a high-entropy alloy isothermal heat treatment method, comprising the following steps:
[0039] S1, the high entropy alloy Al 15 Mg 45 Li 39 Ca 0.5 Si 0.5 Place in a box-type resistance furnace, and use No. 5 flux to cover the high-entropy alloy, and pass through argon protection;
[0040] S2. At a temperature of 425°C, heat treatment isothermally for 16 minutes, 18 minutes, 20 minutes and 22 minutes respectively;
[0041] S3, then the high-entropy alloy Al after isothermal heat treatment 15 Mg 45 Li 39 Ca 0.5 Si 0.5 Put into water for water quenching treatment.
Embodiment 3
[0043] This embodiment provides a high-entropy alloy isothermal heat treatment method, comprising the following steps:
[0044] S1, the high entropy alloy Al 15 Mg 45 Li 39 Ca 0.5 Si 0.5 Place in a box-type resistance furnace, and use No. 5 flux to cover the high-entropy alloy, and pass through argon protection;
[0045] S2. At a temperature of 430°C, heat treatment isothermally for 16 minutes, 18 minutes, 20 minutes and 22 minutes respectively;
[0046] S3, then the high-entropy alloy Al after isothermal heat treatment 15 Mg45 Li 39 Ca 0.5 Si 0.5 Put into water for water quenching treatment.
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Abstract
The invention provides a high-entropy alloy isothermal heat treatment method which comprises the following steps: carrying out isothermal heat treatment on a high-entropy alloy at the temperature of 420-440 DEG C for 16-22 minutes, and putting the high-entropy alloy subjected to the isothermal heat treatment into water for water quenching. According to the isothermal heat treatment method for the light high-entropy alloy, the high-entropy alloy is placed in the box-type resistance furnace to be subjected to isothermal heat treatment, water quenching is conducted after isothermal heat treatment is completed, the isothermal heat treatment method achieves a non-dendritic crystal spherical structure in the secondary heating process before semi-solid thixoforming, the process is simple, special equipment is not needed, cost is low, and the method is suitable for industrial production. According to the isothermal heat treatment method for the high-entropy alloy, the semi-solid structure with the good spheroidizing effect is obtained in the isothermal heat treatment process through changes of the heat treatment time and the heat treatment temperature, and the alloy performance is improved.
Description
technical field [0001] The invention relates to the technical field of alloys, in particular to an isothermal heat treatment method for high-entropy alloys. Background technique [0002] Compared with traditional alloys, high-entropy alloys are composed of more than five main elements with a molar content between 5% and 35%. They have excellent properties such as high strength and hardness, good wear resistance and corrosion resistance. It has broad application prospects in terms of performance. However, defects such as coarse dendrite structure, uneven composition and high porosity are prone to occur in cast high-entropy alloys, which makes the plasticity of high-entropy alloys low, making it difficult to plastically deform and form, which limits the wide application of high-entropy alloys. Therefore, it is of great significance to explore an advanced forming method for the problem of low plasticity and difficult forming of cast high-entropy alloys. Contents of the inven...
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