Yielding and strain hardening in aluminium single-crystal foils subjected to tension and bending
Yielding and strain hardening in aluminium single-crystal foils subjected to tension and bending
复制标题
铝单晶箔在拉伸和弯曲作用下的屈服和应变硬化
DOI：
10.1080/09500839.2012.691214
复制
发表时间：
2012
影响因子：
1.2
通讯作者：
M. Kuroda
中科院分区：
文献类型：
--
作者：
M. Sato;Y. Matsuki;I. Hayashi;M. Kuroda
对20 - 90 µm不同厚度的单晶铝箔试样进行了一系列拉伸和微弯曲试验。在测试中考虑了相对于拉伸方向的两种不同的晶体取向：一种是预期激活四个不同滑移面上的至少四个滑移系的取向，另一种是预期仅激活单滑移系的取向。在拉伸试验中，观察到典型的初始屈服强度的尺寸依赖性。微弯测试方法扩展到包括弯曲方向的反转。利用反向弯曲试验得到的箔材厚度平方归一化弯矩-表面应变曲线，将应变硬化总量分为各向同性硬化分量和随动硬化分量。在微弯试验中，明显的尺寸依赖性的运动硬化行为被清楚地观察到，同时，各向同性硬化的量是非常小的，特别是对于单滑移取向。
A series of tensile and microbend tests were conducted on aluminium single-crystal foil specimens with different thicknesses ranging from 20 to 90 µm. Two different crystal orientations relative to the tensile direction were considered in the tests: one is an orientation that was excepted to activate at least four slip systems on four different slip planes, and the other is an orientation that was expected to activate only a single-slip system. In the tensile tests, typical size dependence of initial yield strength was observed. The microbend test method was extended to include a reversal of bending direction. Using the curves of bending moment normalized by the square of foil thickness versus surface strain, which were obtained from the reversed bending tests, the total amounts of strain hardening were divided into isotropic and kinematic hardening components. In the microbend tests, a pronounced size-dependent kinematic hardening behaviour was clearly observed; meanwhile, the amounts of isotropic hardening were very small, particularly for the single-slip orientation.