EFFECT OF Zr ON PHASE TRANSFORMATION IN Cu-Zn-Al SHAPE MEMORY ALLOYS

Abstract

Abstract: An investigation was made of the influence of Zr additive on the high temperature phase trans- formations,martensitic forward/reverse transformations,and shape memory effect of Cu-Zn-Al base alloys by means of differential scanning calorimetry(DSC),X-ray diffraction and TEM.It was found that an addition of 0.35 wt-% Zn could effectively inhibit the precipitation of α and γ phases and hence promote the order-martensitic transformations β_2→DO_3→18RM,thus resulting in a minimum activation energy of the martensitic trans- formation and narrow temperature ranges(M_s-M_f)and(A_s-A_f);the alloy so obtained pos- sessed smooth and mobile martensite intervariant interfaces,therefore showing the best shape memory effect.

Key words: Cu-Zn-Al alloy, Zr, differential scanning calorimetry, phase transformation

XIAO Jichuang FANG Jianneng South China University of Technology,Guangzhou,China XIAO Jichuang Associate Professor,Dept.of Mechanical Engineering No.2,South China University of Technology,Guangzhou 510641,China. EFFECT OF Zr ON PHASE TRANSFORMATION IN Cu-Zn-Al SHAPE MEMORY ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(2): 93-98.

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EFFECT OF Zr ON PHASE TRANSFORMATION IN Cu-Zn-Al SHAPE MEMORY ALLOYS

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