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本文论述了(QBe2)铍青铜超塑性的机械性能和显微组织的变化。结果表明,在温度450～640℃和应变速率1.95×10~(-4)～1.67×10~(-2)s~(-1)范围内,合金呈现良好的超塑性效应。合金可不经预先处理,直接利用原始形变组织拉伸,通过再结晶和第二相粒子的脱溶,得到稳定的微细等轴晶粒。合金在550℃以应变速率ε=1.95×10~(-4)s~(-1)拉伸,得到延伸率780%。合金超塑性具有各向异性特征。与板材轧向成45°切取的试样拉伸,得到延伸率860%;90°的为675%;0°的为550%。在较高速率下变形时不显示各向异性。试样的断裂是由空洞连接和颈缩发展所引起的。
This article discusses the mechanical properties and microstructural changes of (QBe2) beryllium bronze superplastic. The results show that the alloy exhibits a good superplasticity at a temperature of 450-640 ℃ and a strain rate of 1.95 × 10 -4 to 1.67 × 10 -2 s -1. The alloy can be directly processed by the original deformation of the tissue without prior treatment, by the recrystallization and second phase particles desolvency, to obtain stable fine equiaxed grains. The alloy was stretched at a strain rate of ε = 1.95 × 10 ~ (-4) s ~ (-1) at 550 ℃, and an elongation of 780% was obtained. Superplastic alloy has anisotropic characteristics. Tensile specimens were cut at a 45 ° angle with sheet rolled to give an elongation of 860%; 675% at 90 °; and 550% at 0 °. Anisotropy does not show when deformed at higher rates. The fracture of the specimen is caused by the development of empty connections and necking.