The correlation between plastic strain and crystallographic misorientation, grain size, grain orientation, distance from grain boundary, and loading history were investigated experimentally and numerically for body-centered-cubic (BCC) polycrystalline microstructures based on a misorientation deviation (MD) approach. Nine monotonic tensile experiments were performed on two BCC titanium alloys inside a scanning electron microscope (SEM). The influence of reference orientation was explored both at the grain scale and at the mesoscale using electron backscattered diffraction (EBSD). The correlation between global plastic strain and the MD was quantified. The tendency for orientation change was quantified as a function of plastic strain and grain orientation for three crystallographic orientations (i.e., [100], [110], and [111]) with respect to tensile direction. The subpopulation of small grains exhibited a lower level of misorientation dispersion compared with larger grains, and this discrepancy became more pronounced at higher strains. An empirical equation was proposed to estimate the level of misorientation dispersion for individual grains as a function of grain size and global plastic strain level. Two interrupted in-situ SEM experiments were performed, and this resulted in a significantly increased misorientation compared with uninterrupted tests performed to similar plastic strain levels.

针对体心立方 (BCC) 多晶微观结构，基于取向误差 (MD) 方法，通过实验和数值研究了塑性应变与晶体取向误差、晶粒尺寸、晶粒取向、与晶界的距离和加载历史之间的相关性。在扫描电子显微镜 (SEM) 内对两种 BCC 钛合金进行了九次单调拉伸实验。使用电子背散射衍射 (EBSD) 在晶粒尺度和中尺度上探索了参考取向的影响。对全局塑性应变和 MD 之间的相关性进行了量化。取向变化的趋势被量化为三个晶体取向的塑性应变和晶粒取向的函数（即，[100]、[110]、和 [111]) 相对于拉伸方向。与大晶粒相比，小晶粒亚群表现出较低水平的错误取向，并且这种差异在较高应变下变得更加明显。提出了一个经验方程来估计作为晶粒尺寸和整体塑性应变水平的函数的单个晶粒的取向偏差水平。进行了两次间断的原位 SEM 实验，与对类似塑性应变水平进行的不间断测试相比，这导致定向错误显着增加。提出了一个经验方程来估计作为晶粒尺寸和整体塑性应变水平的函数的单个晶粒的取向偏差水平。进行了两次间断的原位 SEM 实验，与对类似塑性应变水平进行的不间断测试相比，这导致定向错误显着增加。提出了一个经验方程来估计作为晶粒尺寸和整体塑性应变水平的函数的单个晶粒的取向偏差水平。进行了两次间断的原位 SEM 实验，与对类似塑性应变水平进行的不间断测试相比，这导致定向错误显着增加。