摘要
通过恰当的成分设计 ,可得到具有较高马氏体相变温度及较宽相变滞后的Cu Al Mn形状记忆合金。用DSC(differentialscanningcalorimetry)及差热分析法测得 :Cu 13.5Al 2 .5Mn 1.36Zn合金的M 点(降温时马氏体相变最激烈的温度 )为 2 5 0℃ ;淬火后相变滞后宽度达到 16 7℃。此合金具有良好的单向形状记忆效应 ,在表面应变为 4 %时 ,淬火态弯曲变形试样的形状回复率达 95 % ,马氏体态长期时效对其影响不大 ,淬火后室温下 (马氏体态 )时效 2年 ,弯曲变形试样的形状回复率达 90 %。室温淬火后 ,合金的力学性能指标如下 :抗拉强度约 2 5 0MPa ,伸长率约 7% ,硬度为 190HB。这种合金具有性能稳定、可用温度及时间范围较宽、力学性能较好等特点。
A Cu-Al-Mn shape memory alloy with broad hysteresis and high temperature martensitic transformation can be obtained by proper design of its composition. DSC (differential scanning calorimetry) and differential-thermal analyses show that the M * of the alloy is about 250℃ and the hysteresis range is about 167℃ in quenched state. After quenching at room temperature, the alloy has the mechanical properties of a tensile strength of 250 MPa, a plastic elongation of 7%, a hardness of 190 HB, and a shape recovery rate of 95% after bending deformation at surface strain of 4%. Long period aging in martensitic state does not evidently influence its shape memory effect. For example, there is still a shape recovery rate of 90% after aging at room temperature for two years. Therefore, this kind of alloy has characteristics of stable property, rather high temperature and long duration for application.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2003年第4期17-21,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目 (59771 0 4 0 )
关键词
高温宽相变滞后
单向形状记忆效应
铜基合金
high temperature and broad phase transformation hysteresis
one-way shape memory effect
Cu-based alloy
