Thermoelastic martensite and shape memory effect in ductile Cu-Al-Mn alloys
Thermoelastic martensite and shape memory effect in ductile Cu-Al-Mn alloys
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DOI：
10.1007/bf02651873
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发表时间：
1996-08-01
影响因子：
2.8
通讯作者：
Ishida, K
中科院分区：
文献类型：
--
作者：
Kainuma, R;Takahashi, S;Ishida, K
通过控制 β 相的有序度，开发出了 Cu-Al-Mn 系的延性形状记忆 (SM) 合金。在二元铜铝合金中添加 Mn 可稳定 β 相并加宽单相区，从而实现更低的温度和更低的 Al 含量。结果表明，低Al含量的Cu-Al-Mn合金要么具有无序的A2结构，要么具有较低有序度的有序L2(1)结构，并且表现出优异的延展性。无序的 A2 相马氏体转变为无序的 A1 相，并具有高密度的孪晶。由有序L2相形成的马氏体相具有18R结构。 SM 效应伴随着 A2 --> A1 和 L2(1) --> 18R 马氏体转变。这些合金表现出 15% 的失效应变、60% 至 90% 的轧制压下量（无裂纹）以及马氏体条件下弯曲测试的 80% 至 90% 的回复率。介绍并讨论了延性 Cu-Al-Mn 合金的微观结构、晶体结构、机械性能和形状记忆行为的实验结果。
Ductile shape memory (SM) alloys of the Cu-Al-Mn system have been developed by controlling the degree of order in the beta phase. Additions of Mn to the binary Cu-Al alloy stabilize the beta phase and widen the single-phase region to lower temperature and lower Al contents. It is shown that Cu-Al-Mn alloys with low Al contents have either the disordered A2 structure or the ordered L2(1) structure with a lower degree of order and that they exhibit excellent ductility. The disordered A2 phase martensitically transforms to the disordered A1 phase with a high density of twins. The martensite phase formed from the ordered L2, phase has the 18R structure. The SM effect accompanies both the A2 --> A1 and L2(1) --> 18R martensitic transformations. These alloys exhibit 15 pct strain to failure, 60 to 90 pct rolling reduction without cracking, and 80 to 90 pct recovery from bend test in the martensitic condition. Experimental results on the microstructure, crystal structure, mechanical properties, and shape memory behavior in the ductile Cu-Al-Mn alloys are presented and discussed.