摘要
以低铝含量的Cu8.8Al5.9Mn0.3La合金为研究对象,探究了不同拉伸预变形量对合金组织、相变点、阻尼特性的影响规律。结果表明:变形量为5.0%时,马氏体再取向已经完全,此后的变形产生了大量的变形孪晶和马氏体旋转破碎,对原马氏体界面的连续性产生不利影响。预变形会不同程度地提高马氏体正逆相变的温度,并且预变形量大于5.0%时,变形产生的大量位错增加了相变的摩擦阻力,导致相变热滞陡增。变形量在3.5%以下时,变形量增加可以提高马氏逆相变能力,阻尼峰值升高,但是变形量过大导致马氏体不连续,会阻碍马氏体逆相变,阻尼峰值下降。
The influence of tensile pre-deformation on microstructure,shape memory effect and damping capacity was investigated for Cu-8.8Al-5.9Mn-0.3La alloy.Experimental results showed that the orientation of martensite has been complete when the deformation is 5%;deformation twins and martensite rotation crushing are produced when the pre-deformation continues to increase,which breaks the continuity of martensitic interface.The pre-deformation increases the temperature of martensitic transformation,and when the pre-deformation is beyond 5.0%, a large number of dislocations produced by the deformation increase the friction resistance of the phase transformation,which leads to the steeply rising of the transformation thermal hysteresis.When the deformation amount is below 3.5%,the increase of deformation can increase the capability of martensitie reverse phase transition and the peak value of damping increases.However,the excessive deformation causes martensitie discontinuity to block the reverse martensitic transformation and thus the damping peak decreases.
作者
陈顺
陈忠家
王梓杰
丁春园
CHEN Shun;CHEN Zhong-jia;WANG Zi-jie;DING Chun-yuan(School of Material Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)
出处
《金属功能材料》
CAS
2018年第6期31-35,共5页
Metallic Functional Materials
基金
安徽省科技重大专项计划项目资助(16030901052)
