外加载荷对热弹性马氏体正-逆相变影响机制的相场模拟研究  

Phase Field Study of the Effect of External Loading on the Transformation-Reverse Transformation of Thermoelastic Martensite

作　　者：王丽红 满蛟[1] 姜一鸣 刘庚根 周建平[1] WANG Lihong;MAN Jiao;JIANG Yiming;LIU Genggen;ZHOU Jianping(School of Mechanical Engineering,Xinjiang University,Urumqi 830000,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830000

出　　处：《材料导报》2024年第8期222-228,共7页Materials Reports

基　　金：新疆维吾尔自治区高层次人才天池计划(100400028);新疆大学博士启动基金(620320011)。

摘　　要：本工作建立了一种新的马氏体逆相变的相场模型,以Cu-Al-Ni合金为例,研究了热弹性马氏体正相变和逆相变的演化规律,揭示了热弹性马氏体的形状记忆效应。同时模拟了拉伸释放弹性应变能这种机制对热弹性马氏体相变和热弹性马氏体逆相变的作用,研究了外加载荷对马氏体逆相变温度As的影响。模拟结果表明:应变能是形状记忆合金马氏体相变的阻力,是其逆相变的驱动力。在马氏体正相变过程中,拉伸载荷释放了应变能,降低了相变阻力,从而对马氏体相变起促进作用;在马氏体的逆相变过程中,由于拉伸载荷降低了马氏体所储存的应变能,因而降低了逆相变过程的驱动力,使合金逆相变As温度升高,进而提高了热弹性马氏体的低温稳定性。模拟结果与实验结果相一致。A new phase field model of reverse martensitic transformation was established in this study. Taking Cu-Al-Ni alloy as an example, the evolution law of thermoelastic martensitic transformation and reverse martensitic transformation was studied, and the shape memory effect of thermoelastic martensitic was revealed. The effect of the mechanism of tensile release of elastic strain energy on the thermoelastic martensitic transformation and thermoelastic reverse martensitic transformation was simulated, and the effect of applied load on the temperature As of reverse martensitic phase transformation was investigated. The simulation results show that the strain energy is the resistance to the martensitic transformation of the shape memory alloy and the driving force for reverse martensitic transformation. In the process of martensitic transformation, the tensile load releases the strain energy and reduces the resistance to martensitic transformation, thus promoting the martensitic transformation. In the process of reverse martensitic transformation, since the tensile load reduces the strain energy stored in the martensitic transformation, it reduces the driving force of the reverse martensitic transformation process and increases the alloy reverse martensitic transformation temperature As , which in turn increases the stability of thermoelastic martensite at low temperatures. The simulation results are consistent with the experimental results.

关 键 词：相场模拟 弹性应变能 Cu-Al-Ni合金 马氏体逆相变 逆相变起始温度 

分 类 号：TG146[一般工业技术—材料科学与工程]