Superplasticity of Cu-Al-Mn-Ni shape memory alloy
Superplasticity of Cu-Al-Mn-Ni shape memory alloy
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DOI：
10.2320/matertrans.d-mra2007879
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发表时间：
2007-11-01
影响因子：
1.2
通讯作者：
Ishida, Kiyohito
中科院分区：
文献类型：
--
作者：
Omori, Toshihiro;Koeda, Naoki;Ishida, Kiyohito
利用光学显微镜和拉伸试验研究了CuAlMn基形状记忆合金在450℃和500℃下的显微组织和超塑性行为。结果表明，在600℃下热处理可获得直径为3 pm的细小α(FeE)+β(Bcc)两相组织。合金的流变应力依赖于应变速率，应变速率敏感性大于0.3，延伸率大于几百%，表明该合金具有超塑性。当试验温度为500℃，应变速率为5×10~(-4)S(~(-1))时，最大延伸率为1150%。观察到平行于拉伸轴的空洞纵梁的形成，且空洞的尺寸随着试件的高度变形而增大。
The microstructure and superplastic behavior at 450 degrees C and 500 degrees C in Cu-Al-Mn-based shape memory alloys were investigated using optical microscopy and a tensile test. It was found that a fine a (fee) + beta (bcc) two-phase structure with a grain size of 3 Pm in diameter can be obtained in Cu-Al-Mn-Ni alloy by annealing at 600 degrees C. The flow stress of Cu-Al-Mn-Ni alloy depends on the strain rate and the strain rate sensitivity is over 0.3 with an elongation of over several hundred percent, which shows that the Cu-Al-Mn-Ni shape memory alloy exhibits superplasticity. For the test temperature at 500 degrees C and a strain rate of 5 x 10(-4) s(-1), a maximal elongation of 1150% was obtained. The formation of cavity stringers lying parallel to the tensile axis was observed and the size of the cavity was larger as the specimen was more highly deformed.