Acta Metallurgica Sinica (English Letters) ›› 1990, Vol. 3 ›› Issue (4): 300-303.

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FINE STRUCTURE VARIATION OF 18R MARTENSITE UNDER DEFORMATION IN POLYCRYSTALLINE CuZnAl AI JOY

ZHU Min LI Guobin YANG Dazhi Dilian University of Technology,Dalian,China Dept.of Materials Engineering,Dalian University of Technology,Dalian 116024,China   

  • 收稿日期:1990-08-25 修回日期:1990-08-25 出版日期:1990-08-25 发布日期:2009-10-10

FINE STRUCTURE VARIATION OF 18R MARTENSITE UNDER DEFORMATION IN POLYCRYSTALLINE CuZnAl AI JOY

ZHU Min LI Guobin YANG Dazhi Dilian University of Technology,Dalian,China Dept.of Materials Engineering,Dalian University of Technology,Dalian 116024,China   

  • Received:1990-08-25 Revised:1990-08-25 Online:1990-08-25 Published:2009-10-10

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摘要： <正> The transmission electron microscopy has been used to investigate the fine structure variationof 18R martensite under deformation in a polycrvstalline CuZnAl shape memory alloys.Ithas been found that the strain is gabined by the reorientation of martensite variants in the ini-tial deformation stage.In addition to the result of optical microscopy studies,however,thereorientation is often incomplete and the interfaces among the prior variants still remain.A lotof twins will appear in martensite under enormous deformation,and the twin plane is(001)phane of martensite lattice.The dislocations has also been observed in some regions.In thiscase,the martensite will lose its thermoelasticitv and the shape memory effect will bedamaged.

Abstract: The transmission electron microscopy has been used to investigate the fine structure variation of 18R martensite under deformation in a polycrvstalline CuZnAl shape memory alloys.It has been found that the strain is gabined by the reorientation of martensite variants in the ini- tial deformation stage.In addition to the result of optical microscopy studies,however,the reorientation is often incomplete and the interfaces among the prior variants still remain.A lot of twins will appear in martensite under enormous deformation,and the twin plane is(001) phane of martensite lattice.The dislocations has also been observed in some regions.In this case,the martensite will lose its thermoelasticitv and the shape memory effect will be damaged.

Key words: fine structure, shape memory alloy, CuZnAl alloy, martensitic transformations