在 250 至 550°C 的温度范围和 0.01 至 10 s -1 的应变速率下，通过真空热压 (VHP) 研究了铍的单轴压缩 (UAC) 性能。应力-应变曲线中显示的锯齿状流动和屈服点是由 Portevin-Le Chatelier 效应 (PLCE) 引起的。建立了基于真应变的Arrhenius型本构方程，并通过计算的活化能推导出Fe和C在溶液中的体积扩散。典型的微观结构不稳定特征是界面开裂和晶内开裂。最佳变形参数为350℃和0.01 s -1，变形组织均匀，缺陷几乎没有增加。
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Hot compression behaviors and microstructural evolution of beryllium by vacuum hot pressing
The uniaxial compressive (UAC) performance of beryllium by vacuum hot pressing (VHP) was investigated in the temperature range from 250 to 550°C and strain rate from 0.01 to 10 s−1. Serrated flow and yield point showed in the stress–strain curve are caused by Portevin-Le Chatelier effect (PLCE). Arrhenius type constitutive equation based on true strain is established and the volume diffusion of Fe and C in solution is deduced by the calculated activation energy. The typical microstructure instability characters are interfacial cracking and intragranular cracking. The optimum deformation parameter is 350°C and 0.01 s−1, with uniform deformed microstructure and almost little defect increasing.