Acta Metall Sin  1988, Vol. 24 Issue (4): 228-235    DOI:

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EFFECT OF MARTENSITE ORDERING ON SME IN A Cu-Zn-Al ALLOY

QI Xuan;JIANG Bohong;XU Zuyao(T.Y. Hsu) Shanghai Jiaotong UniversityDept.Mater. Sci. and Eng.;Shanghai Jiaotong University;Shanghai

QI Xuan;JIANG Bohong;XU Zuyao(T.Y. Hsu) Shanghai Jiaotong UniversityDept.Mater. Sci. and Eng.;Shanghai Jiaotong University;Shanghai. EFFECT OF MARTENSITE ORDERING ON SME IN A Cu-Zn-Al ALLOY. Acta Metall Sin, 1988, 24(4): 228-235.

Abstract References Related Articles Recommended Metrics Download:  PDF(1366KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The correlation between the shape memory effect (SME) and theordering degree of martensite formed during various heat treatment processes, e. g.ice water quenching, step-quenching and quenching plus aging, has been studied ina Cu-Zn-Al alloy. The ordering degree of martensite is characterized by the spacingdifference, Δd, of some pairs of diffracting planes, the indices of which satisfy theequation (h_1~2-h_2~2)/3=(k_2~2-k_1~2)/n. It is shown that the SME depends on Δd monoto-nically. The ordering extent of the DO_3 parent phase and of the martensite in turnincreases with the holding duration in the course of step-quenching, which may bethe main factor for enhancing the shape recovery rate η. The stabilization of themartensite may be associated with the clustering of vacancies which results in thelowering of the ordering degree. The decrease of the SME upon aging at highertemperature or holding at step-quenching temperature for longer time is due to theaccumulation of solute atoms and the precipitation of α-phase, which lowers theordering extent. Key words:  Cu-Zn-Al alloy      martensite      ordering      shape memory effect      Received:  18 April 1988      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1988/V24/I4/228 1 Otsuka K, Shimisu K. Scr Metall, 1970; 4: 469 2 江伯鸿,陈树川,漆璿,刘和,王承宝,徐祖耀.全国形状记忆合金学术交流会文集,第3册,中国有色金属学会,1985 3 Stice J D, Wayman C M. Metall Trans, 1982, 13A: 1687 4 Schofield D, Miodownik A P. Met Technol, 1980; 4: 167 5 鲁小叶,曹明盛.全国形状记忆合金学术交流会文集,第3册,中国有色金属学会,1985 6 冯继文,桂嘉年,王子孝.全国形状记忆合金学术交流会文集,第3册,中国有色金属学会,1985 7 Delaey L, Deruyttere A, Aernoudt E, Roos J K. Report 78 R1, Department Metallkunde Katholieke Universiteit, 1978: 38 8 Dunne D P, Kennon N F. 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