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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Crystal structure and thermal stability of 
martensite in Cu-24Al-3Mn alloy
LI Zhou(李  周)1,2,WANG Ming-pu(汪明朴)1,CAO Ling-fei(曹玲飞)1
SU Yu-chang(苏玉长)1, XU Gen-ying(徐根应)2

1. Department of Materials Science and Engineering,
 Central South University, Changsha 410083, China;
2. Department of Materials Science and Engineering,
 Hefei University of Technolo gy, Hefei 230009, China

Abstract:The crystal structure and thermal stability of the martensite in Cu-24Al-3Mn ( mole fraction, %) alloy were studied by X-ray diffraction, electron diffraction, Vt curve measurement. The 18R martensite with fairly perfect long-range order can be obtained by water-quenching the alloy. The atoms distribution on the basal plane of the martensite is as follows: Ⅰ, 3/25 Mn+22/25 Cu; Ⅱ , 3/25 Al+22/25 Cu; Ⅲ, 18/25 Al+7/25 Cu, correspondingly, the parent phase may h ave Heusler structure. From the electron diffraction result, the crystal structu re is determined to be of a modified 18R type but closely approaching orthorhom bic 18R type, its lattice parameters are determined to be a=0.4474nm,  b=0.5229nm, c=3.815nm and β=89.6° from the X-ray diffraction results. The obtained alloy has a higher thermal stability than that of the conventional Cu-Zn-Al alloy. 

 

Key words: shape memory alloy; Cu-Al-Mn alloy; martensite; crystal structure; thermal stability

ISSN 1672-7029
CN 43-1423/U

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