面心立方金属孪生与滑移共生变形的模拟

In general, there is few investigations for the case palstic deformation that slip and twinning can take place simultaneously since it is very complicated. In the present study, the single-crystal yield surfaces (SCYS's) of cubic metals and the evolution of rolling textures of pure aluminum have been investigated on the crystal plasticity theory of Taylor/Bishop-Hill. The SCYS's and their characteristics in face-centered cubic (f.c.c.) metals for {111}<110> slip and {111}<112> twinning have been analyzed and derived systematically. As far as body-centered cubic (b.c.c.) metals are concerned, the SCYS's and their characteristics are analyzed and calculated for {110}<111>、{112}<111> and {123}<111> multiple-slip under the different platic deformation cases. The Taylor factors and yield strength anisotropies have also been calculated for axisymmetric and ideal plane plastic deformation. Using the Taylor-type models, a new principle, the minimum sum of shear displacement gradient tensor components ( ), has been proposed for the solution of the ambiguity problem in the selection of active slip systems. The rolling textures of pure aluminum are simulated with randomly distributed initial orientations and initial textures. The influences of lubrication conditions on the cold-rolling textures of high-purity aluminum foils are investigated as well.

探明能满足形状任意改变的FCC金属单晶孪生与滑移共生变形的屈服应力状态；建立共生变文Ｐ秃退苄员湫位谷∠蚩占渫迹猣cc金属材料提供完备的塑性变形机制。模拟计算，确定能满足一定变形条件的屈服角点范围；进行平面应变压缩实验，确立孪生与晶体取向的关系，并将结果拓展到多晶材料。模拟中低层错能多晶材料的轧制织构。提供模型及仿真软件。