J Mater Sci Technol ›› 1993, Vol. 9 ›› Issue (3): 172-176.

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Isothermal Aging Kinetics in CuZnAl Shape Memory Alloy

Zengqi ZHAO Lab.of Physics,Baotou Research Institute of Rare Earth,Baotou,014010,ChinaFeixia CHEN Dazhi YANG Dept.of Mater.Eng.,Dalian University of Technology,Dalian,116024,ChinaEr BAO Dept.of Mater.Eng.,Yanshan University,Qinhuangdao,066004,China   

  • Received:1993-05-28 Revised:1993-05-28 Online:1993-05-28 Published:2009-10-10

Abstract: Isothermal aging behaviours of a CuZnAl shape memory alloy have been investigated by means of dilatometry.The length of the specimens during isothermal aging from 190 to 280℃ increases with the aging time at each temperature.The isothermal aging kinetics fits in Avrami equation and the time exponent n decreases with the increase in aging temperature.The apparent activation energy for the isothermal aging process was measured to be 109.0kJ/mol,which is about equal to that of a relaxation internal friction peak at about 200℃ (f≈1 Hz) in the alloy.

Key words: isothermal aging kinetics, CuZnAl alloy, shape memory, bainitic transformation, activation energy