EFFECTS OF THERMAL CYCLES ON THE PROPERTIES OF CuZnAl SHAPE  MEMORY ALLOYS

Abstract

Abstract: Theinfluencesofthermalcycleson propertiesof CuZnAlshape memory alloysunder differentheatingtemperatures, pre deformation amountεand addition amountofcomplex rareearthmixture wereresearched with X ray diffraction and electron microscope. Theresultsindicate thatthermalcyclescanincreasethetransformationtemperatureofthealloysby 5～6℃.In creasingthe pre deformation amount will decrease the necessary cycle times for stabletwo -wayshape memory property. Howevertheshaperecovery rateofthealloy willdecreaseasthepre deformation amountexceeds3 6 % . Theshape memory propertyofthealloy willchangeinsignificantlyiftheaddition amountofrareearthislessthan 0 10 % . Butthealloys with outrareearth willhave worseshape memory property afterthermalcyclesreach 1800 times.

Key words: thermalcycle, shape memory alloy, advance deformation , shape memoryproperty

N.C.Si and S.C.Sun Departmentof Materials Engineering,Jiangsu University of Science and Technology,Zhenjiang 212013 ,China. EFFECTS OF THERMAL CYCLES ON THE PROPERTIES OF CuZnAl SHAPE MEMORY ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(4): 515-520.

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EFFECTS OF THERMAL CYCLES ON THE PROPERTIES OF CuZnAl SHAPE MEMORY ALLOYS

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