Grain-Scale Plastic Deformation in Metals: Experimental Observations Using Orientation Imaging Microscopy and Numerical Simulations

小行星9612343 塑性变形的过程是在多晶金属中单个晶粒的水平上探索相邻晶粒之间相互作用的相关性质。 为此目的，在槽模压缩中，使用Osplit试样试验研究了工业纯铝中随变形发生的晶粒尺度微观结构的演变。 背散射菊池衍射（BKD）和取向成像显微镜（OIM）被用来确定晶粒取向。 一个选定的范围内的变形路径，应变水平，温度和应变速率，晶粒尺寸，亚晶粒颗粒，和起始纹理进行了探索，以获得变形过程的理解。 研究的一个目标是确定与晶粒内取向差相关的固有长度尺度;这是每个晶粒内一起旋转的区域的大小。 局部应变分布测量内和晶粒之间使用光刻胶技术和OIM。 建模的目的是纠正现有模型中观察到的缺陷，并扩展到对观察到的固有长度尺度的预测。 多晶合金的塑性变形是变形合金制造中的一个重要工序。 该研究可能会导致晶粒内取向差和再结晶的预测模型。 ***

9612343 Doherty The process of plastic deformation is explored at the level of individual grains in a polycrystalline metal the related nature of the interactions between adjacent grains. To this end the evolution of grain-scale microstructure occurring with deformation in commercially pure aluminum is studied using a Osplit sample testO in channel-die compression. Back-scattered Kikuchi diffraction (BKD) and Orientation Imaging Microscopy (OIM) are employed to determine grain orientations. A selected range of deformation paths, strain levels, temperatures and strain rates, grain sizes, sub- grain particles, and starting textures are explored to gain understanding of the deformation process. A goal of the research is to determine the inherent length scale that is associated with in-grain misorientations; this is the size of the regions which rotate together within each grain. Local strain distribution is measured within and between grains using photoresist techniques and OIM. Modeling is aimed at correcting observed deficiencies in current models and are extended for the prediction of the observed inherent length scales. %%% The plastic deformation of polycrystalline metallic alloys is an important process in wrought alloy manufacture. The research could lead to a predictive model for in-grain misorientations and recrystallization. ***