冷却速率对CuAlNi形状记忆合金阻尼行为的影响  

Effect of Cooling Rates on Damping Behavior of CuAlNi Shape Memory Alloy

作　　者：雷波 郝刚领[1] 李育川 王金 LEI Bo;HAO Gangling;LI Yuchuan;WANG Jin(College of Physics and Electronic Information,Yan’an University,Yan’an 716000,Shaanxi,China)

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000

出　　处：《材料导报》2022年第24期127-130,共4页Materials Reports

基　　金：国家自然科学基金(52061038,51661032,51301150);陕西省科技厅陕西青年科技新星人才专项(2013KJXX-11);陕西省“特支计划”区域发展人才专项(2020-44);延安大学研究生教育创新计划项目(YCX2021061)。

摘　　要：Cu基形状记忆合金作为一类重要的阻尼材料有着广泛的目标需求,其室温附近高阻尼能力更是与应用直接相关,获得了广泛关注。采用粉末冶金技术制备了Cu-27.5Al-3.5Ni(原子分数/%,下同)形状记忆合金,通过改变冷却方式实现了对材料微观结构的调控。实验结果表明,水冷和空冷样品中各有一个典型的内耗峰,该峰随冷却速率的增大向低温区室温附近移动,分析认为内耗峰起源于马氏体逆相变。对于炉冷样品,由于冷却速率过低,材料发生共析分解,无马氏体相产生,进而无内耗峰产生。与炉冷和空冷样品相比,水冷样品具有更高的室温域阻尼能力,这与马氏体条数量以及马氏体/奥氏体之间界面的增多有关。Cu-based shape memory alloy as a kind of important damping material has wide objective demands.Its high damping capacity near room-temperature of alloy is directly associated with the application and has gained special attention.In this paper,Cu-27.5Al-3.5Ni(at%)shape memory alloy was prepared by powder metallurgy.The microstructure of the alloy was controlled by changing the cooling mode.A typical internal friction peak was observed in the water-cooling and air-cooling samples,which moved towards lower temperature region near room temperature with the increase of cooling rate.It is rationalized that the internal friction peak is originated with the reverse martensitic transformation.The absence of internal friction peak in furnace cooling samples is attributed to the eutectoid decomposition of the material at high temperature and thus no martensitic phase formation.Compared with furnace-cooled and air-cooled samples,water-cooled samples can obtain higher damping capacity at room temperature range,which is related to the increase of numbers of martensite strips and interface amount between martensite and austenite.

关 键 词：CuAlNi形状记忆合金 阻尼特性 马氏体逆相变 冷却速率 

分 类 号：TG139.6[一般工业技术—材料科学与工程]