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Acta Metall Sin  1995, Vol. 31 Issue (1): 14-18    DOI:
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FORMATION OF SECOND PHASE IN Cu-Zn-Al-Mn-Ni-Ti SMA
CHANG Fenglian;WANG Shidong; ZHANG Jinping; MEl Jianping;SU Huaqin;(Southeast University;Nanjng 210018)(Manuscript received 94-05-06; in revised form 94-10-18)
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CHANG Fenglian;WANG Shidong; ZHANG Jinping; MEl Jianping;SU Huaqin;(Southeast University;Nanjng 210018)(Manuscript received 94-05-06; in revised form 94-10-18). FORMATION OF SECOND PHASE IN Cu-Zn-Al-Mn-Ni-Ti SMA. Acta Metall Sin, 1995, 31(1): 14-18.

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Abstract  The solidification of Cu-Zn-AI-Mn-Ni shape memory alloys may be changed by adding Ti.The dendritic X-phase may preferrentially precipitate at the initial stage out from liquid.The orientation of primary dendrite is〈 111〉.The X-phase spheroidizes and the stable Xl-phase precipitates during solid treatment in high temperature β-phase region.TEM observation showed that Xs-phase precipitated from β-phase nuclear-growth and its shape and size related to heat treatment temperature,holding time and cooling rate. By elevating temperature and prolonging time the shape variation of Xs-phase precipitated is in sequence of:globular, cubic,plum-blossom-like and rughy-shaped.Correspondent: CHANG Fenglian, Analytical and Testing Center,Southeasi University,Nanjing 210018
Key words:  Cu-base shape memory alloy      second phase      crystal growth     
Received:  18 January 1995     
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