CuAlMn形状记忆合金的高阻尼特性

High-damping capacity of CuAlMn shape memory alloys

用悬臂梁弯曲共振法研究了新型CuAlMn系形状记忆合金在马氏体态和母相态的阻尼特性。研究结果表明:室温马氏体态Cu 10.5%Al 6%Mn(质量分数)和室温母相态Cu 11%Al 8%Mn形状记忆合金在表面应变振幅为4.05MPa时,都具有很高的阻尼性能,内耗Q-1接近0.1;两种形态的CuAlMn形状记忆合金的阻尼性能都随应力振幅增加而下降,且母相态合金阻尼性能下降速度更快。

The damping properties of CuAlMn shape-memory alloys both in martensite and parent phase were investigated using cantilever resonant-bar technique. It is found that Cu-10.5%Al-6%Mn and Cu-11%Al-8%Mn(mass fraction) shape memory alloys exhibit high damping capacity both in martensite and parent phase, with internal friction (Q^(-1)) approximately as high as 10^(-1) when the applied stress amplitude is 4.05 MPa. The damping capacity decreases with increasing surface stress amplitude in either martensite or parent phase, while it decreases faster in alloy with parent phase.