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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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Cite this article:
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
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Received: 18 January 1995
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1MiyazakiS,OtsukaK,SakamotoH,ShimizuK.TransJpnInstMet,1981,4:2242SureGN,BrownLC,MetallTrans,1984;15A:16133AdachiK,HamadaY,TagawaY.ScrMelall,1987;21:4534AdachiK,ShojiK.In:MasaoTed,ProcIntConfonAdvancedMaterials,Tokyo,Japan,May31June3,1988,MaterialsResearchSociety,1989:3655常凤莲,王世栋,王毓锐,赵连城.中国有色金属学报,1994;4(4)2 |
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