形变热处理调控AlCoCrFeNi2.1高熵合金组织及性能

摘要/Abstract

摘要： 高熵合金因兼具高强度、高韧性、高温力学性能、抗氧化、耐腐蚀等性能,近年来成为材料领域的研究热点.共晶高熵合金结合共晶合金及高熵合金的优点,使得铸造大尺寸构件成为可能.通过冷轧及退火来调控合金的力学性能,采用XRD、SEM、EDS及拉伸试验研究了共晶高熵合金经不同温度退火后组织及力学性能的变化.结果表明:合金经冷轧30%后,抗拉强度得到异常提升,但延伸率骤降.冷轧30%后在800、900、1 000 ℃退火,组织由部分再结晶逐渐转变为完全再结晶,且晶粒略微长大.800 ℃退火后存在变形的大晶粒和再结晶的小晶粒,多种强化机制协调作用,使得抗拉强度和延伸率分别为1 272 MPa、12.39%.

关键词: 共晶高熵合金, 形变热处理, 异质结构, 力学性能

Abstract: High-entropy alloys have become a focal point in the field of materials in recent years due to their combination of high strength, toughness, high-temperature mechanical properties, oxidation resistance, and corrosion resistance. Eutectic high-entropy alloys combine the advantages of eutectic alloys and high-entropy alloys, making it possible to cast large-scale components. The mechanical properties of the alloy are regulated by cold rolling and annealing, and the changes inmicrostructure organization and mechanical properties of the eutectic high-entropy alloy after annealing at different temperatures are investigated by XRD, SEM, EDS, and tensile testing machine. The results showed that the tensile strength of the alloy is abnormally improved after 30% cold rolling, while the elongation plummeted. After annealing at temperatures of 800 ℃, 900 ℃, and1 000 ℃ after 30% cold rolling, the organization gradually changes from partial recrystallisation to complete recrystallisation, accompanied by slight grain growth. After annealing at 800 ℃, there are deformed large grains and recrystallised small grains, and a variety of reinforcement mechanisms work in a coordinated way to make the tensile strength and elongation to 1 272 MPa and 12.39%, respectively.

Key words: eutectic high-entropy alloys, deformation heat treatment, heterogeneous structure, mechanical properties

中图分类号:

TG156.21

王鹏辉, 张晓波. 形变热处理调控AlCoCrFeNi_2.1高熵合金组织及性能[J]. 兰州理工大学学报, 2024, 50(4): 1-5.

WANG Peng-hui, ZHANG Xiao-bo. Microstructure and properties of AlCoCrFeNi_2.1 high entropy alloy modified by deformation heat treatment[J]. Journal of Lanzhou University of Technology, 2024, 50(4): 1-5.

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