GRAIN SHAPE EFFECT IN SUPERPLASTIC DEFORMATION

Acta Metall Sin

1988, Vol. 24

Issue (4): 354-361 DOI:

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GRAIN SHAPE EFFECT IN SUPERPLASTIC DEFORMATION

CUI Jianzhong;MA Longxiang Northeast University of Technology; ShenyangDepartment of Metals Forming;Northeast University of Technology; Shenyang

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CUI Jianzhong;MA Longxiang Northeast University of Technology; ShenyangDepartment of Metals Forming;Northeast University of Technology; Shenyang. GRAIN SHAPE EFFECT IN SUPERPLASTIC DEFORMATION. Acta Metall Sin, 1988, 24(4): 354-361.

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Abstract The effects of grain shape on the accommodation velocity of grainboundary sliding, which is the dominant mechanism in superplastic deformation, onthe contribution of each mechanism to the total strain and the region transitionstrain rate have been discussed. A new concept, critical aspect ratio for superplas-ticity, has been proposed. The results predicated by means of the new concept werecompared with those experimentally observed in an Al-Zn-Mg alloy.

Key words: superplastic deformation thermomechanical treatment grain shape

Received: 18 April 1988

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