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已掌握试验合金超塑性板材的制取工艺,获得平均晶粒大小为7.78μm截长的细晶。该板材的超塑性力学特性系统试验表明,于550℃ε_0=(3.3～6.6)×10~(-1)分~(-1)范围拉伸变形,能获得δ=890～1050％、m≥0.4的较佳超塑性。超塑性变形后断裂试样的显微解析揭示,断裂处附近不仅晶粒粗大(>20μm)而且有密集孔洞,孔洞大小相当于一个粗大晶粒,试验合金系孔洞敏感材料。
Having mastered the preparation process of the superplastic plate of the test alloy, fine crystals with an average crystal grain size of 7.78 μm were obtained. The systematic superplasticity tests of the plate show that δ = 890 ~ 1050% can be obtained by tensile deformation in the range of ε0 = (3.3 ~ 6.6) × 10 ~ (-1) ~ (-1) at 550 ℃, m≥ 0.4 better superplasticity. Microscopic analysis of the ruptured specimen after superplastic deformation revealed that not only coarse grains (> 20 μm) but also dense pores near the fracture, the pores corresponded in size to a coarse grain and the test alloy was a hole-sensitive material.