Effects of aging on stress-induced martensitic transformation in ductile Cu-Al-Mn-based shape memory alloys
Effects of aging on stress-induced martensitic transformation in ductile Cu-Al-Mn-based shape memory alloys
复制标题
DOI：
10.1016/j.actamat.2009.08.011
复制
发表时间：
2009-11-01
期刊：
影响因子：
9.4
通讯作者：
Ishida, K.
中科院分区：
文献类型：
--
作者：
Sutou, Y.;Koeda, N.;Ishida, K.
通过室温循环拉伸试验，研究了相对晶粒度d/D=6的织构Cu(71.9)Al(16.6)Mn(9.3)Ni(2)B(0.2)和随机织构的Cu(72.1)Al(16.9)Mn(0.5)Co(0.5)形状记忆合金(SMA)线材在473~573K时效对应力诱发马氏体相变的影响。无规则织构的Cu(72.1)Al(16.9)Ma(10.5)Co(0.5)丝经时效处理后，变形不均匀，塑性显著降低。另一方面，在织构的Cu(71.9)Al(16.6)Mn(9.3)Ni(2)B(0.2)SMA丝材中，马氏体相变的临界应力和抗拉强度随着时效的增加而增加，而超弹性(SE)的损失不大。即使在Sigma(T)大于750 Mpa的织构丝材中，由于形成了细小的贝氏体相，也可以获得约6%的优良SE应变。现场观察证实，应力诱发马氏体片的生长伴随着贝氏体片的变形。(C)2009年Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Effects of aging at 473-573 K on stress-induced martensitic transformation for textured Cu(71.9)Al(16.6)Mn(9.3)Ni(2)B(0.2) and random-textured Cu(72.1)Al(16.9)Mn(0.5)Co(0.5) shape memory alloy (SMA) wires with a large relative grain size d/D = 6 were investigated by cyclic tensile testing at room temperature, where d and D indicate mean grain size and wire diameter, respectively. The random-textured Cu(72.1)Al(16.9)Ma(10.5)Co(0.5) wire cannot be uniformly deformed and the ductility is drastically reduced by aging treatment. On the other hand, in the textured Cu(71.9)Al(16.6)Mn(9.3)Ni(2)B(0.2) SMA wire, the critical stress for martensitic transformation sigma(t) and the tensile strength sigma(f) are increased by aging without the associated loss of superelasticity (SE). Even in textured wire with a high sigma(t) of over 750 MPa, an excellent SE strain of about 6% can be obtained due to the formation of a fine bainite phase. Moreover, it was confirmed by in situ observation that stress-induced martensite plates grow, accompanying distortion of the bainite plates. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.