SUPERPLASTIC DEFORMATION BEHAVIOR OF SUPERHARD Al ALLOY LC4

Abstract

Abstract: The superplasticity of high strength superhard A1 alloy LC4 was improved to a great extent by modified thermomechanical treatment.Its maximum elongation may be up to 2100% un- der deformation at initial strain rate of 8.33×10~(-4) S~(-1) at 510℃.Observations of the microstructure changes revealed that with the increase of the deformation,the grain grows and the alloy exhibits strain hardening.The excellent elongation of the alloy seems due to the in- crease of grain stability under deformation.

Key words: superplasticity, thermomechanical treatment, artificial aging, superhard Al alloy

JIANG Xinggang WU Qingling CUI Jianzhong MA Longxiang Northeast University of Technology,Shenyang,China. SUPERPLASTIC DEFORMATION BEHAVIOR OF SUPERHARD Al ALLOY LC4[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(7): 70-73.

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SUPERPLASTIC DEFORMATION BEHAVIOR OF SUPERHARD Al ALLOY LC4

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