Effects of ageing on bainitic and thermally induced martensitic transformations in ductile Cu-Al-Mn-based shape memory alloys

被引：98
作者：
Sutou, Y. [1 ]
Koeda, N. [1 ]
Omori, T. [1 ]
Kainuma, R. [2 ]
Ishida, K. [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
来源：
ACTA MATERIALIA | 2009年 / 57卷 / 19期
基金：
日本学术振兴会;
关键词：
Ageing; Heusler alloys; Martensitic phase transformation; Bainitic transformation; Phase transformation kinetics; BETA-PHASE; ZN; PRECIPITATION; TEMPERATURE; NUCLEATION; KINETICS; GROWTH; DIFFUSION; TEXTURE; SYSTEM;
D O I：
10.1016/j.actamat.2009.08.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of ageing at 473-573 K on the hardness, microstructure and thermoelastic martensitic transformation in Cu-Al-Mn-based shape memory alloys were investigated. It was found that hardness was dramatically increased by ageing due to the formation of fine bainitic plates and that the volume fraction of the bainite phase with ageing time can be described by the Austin-Rickett equation. The martensitic transformation temperatures decreased with the formation of bainite plates, mainly due to the composition change of the beta-matrix. Moreover, the growth of thermally induced martensite plates was disturbed by the existence of bainite plates. Consequently, the transformation intervals (M(s)-M(f) and A(f)-A(s)) and transformation hystereses (A(f)-M(s) and A(s)-M(f)) increased with the progress of bainitic transformation. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：5748 / 5758
页数：11
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