Cu-Al-Mn形状记忆合金低频内耗研究  

Low-frequency Internal Friction Properties of Cu-Al-Mn Shape Memory Alloy

作　　者：王金 郝刚领[1] 李育川 雷波 王伟国[1] 王新福 汪聃 WANG Jin;HAO Gangling;LI Yuchuan;LEI Bo;WANG Weiguo;WANG Xinfu;WANG Dan(College of Physics and Electronic Information,Yan′an University,Yan′an 716000,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：《有色金属工程》2021年第10期26-32,共7页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52061038,51661032,51301150);陕西省青年科技新星计划(2013KJXX-11);陕西省延安市工业攻关计划(2016KG-02)。

摘　　要：Cu-Al-Mn形状记忆合金的阻尼性能与微观组织演变密切相关,深入理解两者之间关系将有助于合金微观结构和阻尼性能的调控,以适用不同的目标需求。采用内耗技术系统地研究了铸态Cu-11Al-5Mn(wt.%)形状记忆合金的内耗行为,以获得材料系统的微观组织演变规律及其与热处理过程的关系。在室温~500℃的内耗-温度谱中发现了4个典型的内耗峰(P1、P2、P3和P4峰)。P1、P2和P4峰表现出明显的相变内耗峰特征,即随温度升高速率增加,峰温向高温方向移动,随测试频率的增加,峰高逐渐降低。分析认为,P1、P2和P4峰的出现分别与逆马氏体相变、孪晶细化和贝氏体析出有关。P3峰为热激活弛豫型内耗峰,激活能为2.32 eV,该峰属于典型的固溶晶界峰,起源于晶界的黏性滑动。The damping properties of the Cu-Al-Mn shape memory alloy are closely related to the microstructure evolution.Deeply understanding the relationship between the two will greatly contribute to the control of microstructure as well as damping properties to meet different target requirements.In this paper,the internal friction behaviors of as-cast Cu-11 Al-5 Mn(wt.%)shape memory alloy was systematically studied by means of internal friction technique,with the expectation of obtaining the alloy microstructure evolution law and the dependence on heat treatment history.Four typical internal friction peaks(respectively named P1,P2,P3 and P4 peak)were observed during heating process ranging from room temperature to 500℃.P1,P2 and P4 peaks exhibit obvious characteristics of phase transformation internal friction peaks,that is,with the increase of heating rate,the peak temperature shift towards the high temperature direction,and with the increase of measurement frequency,the peak height gradually decreases.It was rationalized that the appearance of P1,P2 and P4 peaks are related to the reverse martensitic transformation,twin refinement and bainite precipitation,respectively.While,the P3 peak is a thermally activated relaxation internal friction peak with an activation energy of 2.32 eV.It is concluded that the peak is originated from viscous sliding of grain boundaries and can be understood as a solid solution grain boundary peak.

关 键 词：内耗 CU-AL-MN合金 马氏体相变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]