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对工业供应态LY12铝合金棒材的超塑性进行了研究。结果表明 :该合金在温度为 75 3K、应变速率为 3.3× 10 - 4s- 1的拉伸变形条件下 ,断裂延伸率为 313% ,应变速率敏感性指数m值约为 0 .33;断裂延伸率的实验值与Ghosh Ayres公式的理论值吻合 ;超塑性变形的主导机制符合Langdon大晶粒模型
The superplasticity of industrial supplied LY12 aluminum alloy bars was studied. The results show that the elongation at break of the alloy is 313% and the strain rate sensitivity index m is about 0.33 under tensile strain of 75 3K and strain rate of 3.3 × 10 -4 s -1. The fracture extension The experimental values agree well with the theoretical values of the Ghosh Ayres formula. The dominant mechanism of superplastic deformation conforms to Langdon’s large grain model