Mechanical properties of submicron-grained aluminum
Mechanical properties of submicron-grained aluminum
复制标题
DOI：
10.1016/j.scriptamat.2004.10.035
复制
发表时间：
2005-03
影响因子：
6
通讯作者：
C. Yu;P. Sun;P. Kao;Chun-Ping Chang
中科院分区：
文献类型：
--
作者：
C. Yu;P. Sun;P. Kao;Chun-Ping Chang
等径角挤压法制备的亚微米晶（SMG）铝在77K时具有较高的屈服强度（262MPa）和良好的室温拉伸延展性（28%），但室温拉伸延展性较差。对于这种SMG铝，在拉伸和压缩试验中都观察到流动局部化。在0.35 ~ 0.75μm的晶粒尺寸范围内，压缩屈服强度比拉伸屈服强度高20%左右，而在较大晶粒尺寸范围内，这种拉压不对称性消失。
Submicron-grained (SMG) aluminum produced by equal channel angular extrusion exhibits high yield strength (262MPa) and good ductility (28% total elongation) at 77K, despite the poor tensile ductility at room temperature. For this SMG aluminum, flow localization was observed in both tensile and compressive tests. The yield strength is about 20% higher in compression than in tension over the grain size range of 0.35–0.75μm, and this tension–compression asymmetry disappears for larger grain sizes.