论文标题
三维原位质地发展和可塑性在α-TI合金的循环载荷中的积累
Three-Dimensional In Situ Texture Development and Plasticity Accumulation in the Cyclic Loading of an alpha-Ti Alloy
论文作者
论文摘要
高能同步加速器X射线用于跟踪晶粒旋转和六角形Ti-7Al微结构的微机械演化，因为它循环载荷以下以下是其宏观屈服应力。谷物通过200个循环的演变揭示了整个样品的von mises应力和方向的持续变化，表明可塑性的积累缓慢，即使样品循环以低于其宏观的产量。尽管（宏观）塑性应变可忽略不计，但谷物的重新定位与张力质地的发展相一致。据观察，“硬”取向（接近载荷方向的C轴）的晶粒在卸载后在其滑动系统上保留更多的残留应力，而不是“软”方向上的晶粒。
High-energy synchrotron x-rays are used to track grain rotations and the micromechanical evolution of a hexagonal Ti-7Al microstructure as it is cyclically loaded below its macroscopic yield stress. The evolution of the grains through 200 cycles reveals a continual change in von Mises stress and orientation across the entire specimen indicating a slow accumulation of plasticity even though the sample was cycled below its macroscopic yield. Grain reorientation is consistent with the development of a tension texture despite the negligible magnitude of (macroscopic) plastic strain. It is observed that grains in a "hard" orientation (c-axis close to the loading direction) retain more residual stress on their slip systems upon unloading than the grains in a "soft" orientation.
