Effect of superplastic deformation on the grain size and tensile properties of Al-6.2Zn-2.5Mg-1.7Cu (7010) alloy sheet期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of superplastic deformation on the grain size and tensile properties of Al-6.2Zn-2.5Mg-1.7Cu (7010) alloy sheet

Authors:	A J Shakesheff P G Partridge

Affiliation:	(1) Materials and Structures Department, Royal Aircraft Establishment, Farnborough, Hampshire, UK

Abstract:	An Al-Zn-Mg alloy (7010) was cold-rolled and annealed to produce a small recrystallized grain size, and superplastically deformed in the temperature range 475 to 520° C at strain rates $\dot \varepsilon = {\text{1}}{\text{.1 x 10}}^{{\text{ - 5}}}$ to 2.8×10^–3 sec^–1. At 500° C and $\dot \varepsilon = {\text{2}}{\text{.8 x 10}}^{{\text{ - 5}}}$ sec^–1 superplastic elongations up to 350% were obtained, but above about 60% elongation the residual room-temperature tensile properties after heat treatment decreased due to increasing grain-boundary cavitation. Grain growth rates were increased by superplastic strain.

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