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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 1    March 1995

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PRECIPITATION IN A Cu-BASED SMA
Chang Fenglian ;Wang Shidong; Wang Yurui ;Zhao Liancheng

Analytical and Testing Center; Southeast University; Manjing 210018

Abstract:The morphology , composition and crystal structure of the precipitation in a Cu-Zn-Al-Mn-Ni-Ti shape memory alloy have been studied. The results indicated that there were two different second phase particles in the as-quenched microstructure : a large irregular-shaped XL phase and a fine dispersed XS phase, both of which were ordered L21 b. c. c. structure with the composition(CuNiFe)2 TiAl. For the case of XS, the lattice parameter a(XS)=0. 5879 nm. With low solution-treatment temperature and short treatment time, the XS phase was fine dispersed and coherent to the matrix , nevertheless , the coherency would be destroyed by the growth of XS phase as treatment temperature and time increasing.

 

Key words: crystal structure; shape memory; second phase

ISSN 1672-7029
CN 43-1423/U

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