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用扫描电子显微术研究了微细晶粒的Zn-5%Al-0.05%Mg合金在290℃时于lgσ-igε图中的Ⅱ区或Ⅲ区内拉伸后界面滑动、晶内滑移和扩散蠕变对试样总应变量的分别贡献,获得结果如下:(1)在超塑变形的Ⅱ区内以初始应变速率1.1×10~(-3)S~(-1)拉伸到伸长14%的试样,ε_(bs)/ε_t、ε_(slip)/ε_t和ε_(dIff)/ε_t分别为72.5%、19.8%和7.7%;(2)在非超塑变形的Ⅲ区内以初始应变速率1.1×10~(-1)S~(-1)拉伸到伸长25%的试样,ε_(bs)/ε_t、ε_(slip)/ε_t、和ε_(diff)/ε_t分别为35.8%、48%和16.2%,(3)Zn/Zn晶界的滑动量大于Zn/Al相界的滑动量。
Scanning electron microscopy was used to study the interface slip, in-plane slip and in-plane slip after stretching in zone Ⅱ or zone Ⅲ of lgσ-igε at 290 ℃ for fine grain Zn-5% Al-0.05% Diffusion creep contribution to the total strain of the sample, the results obtained are as follows: (1) in the superplastic deformation zone Ⅱ at an initial strain rate of 1.1 × 10 ~ (-3) S -1 stretching For the 14% longer specimens, the values of ε bs / ε t, ε slip and ε t and ε df / ε t are 72.5%, 19.8% and 7.7%, respectively. (2) Ε bs / ε_t, slip / ε_t, and ε diff / ε t were stretched to 25% elongation at an initial strain rate of 1.1 × 10 -1 S -1 35.8%, 48% and 16.2% respectively. (3) The sliding amount of Zn / Zn grain boundaries is larger than the sliding amount of Zn / Al phases.