摘要
本文在塑性分切应变幅（γpl）为1．3×10-4－7．2×10-3范围内研究了双滑移取向铜单晶体的循环形变行为当γpl＜2×10-3，晶体的初始硬化速率θ0.2较低，几乎与应变幅大小无关。当γpl＞2×10-3，θ0．2随γpl的增加而显著增大． 晶体的循环应力－应变（CSS）曲线在5×10-4＜γpl＜4×10-3范围内呈现一个明显的平台，平台区的范围与单滑移晶体相比明显缩短，但平台区对应的饱和应力相近．和晶体虽然同处于标准取向三角形的001／边上．但其循环形变行为存在明显的差异，可归结为各个滑移系相对于晶体轴的几何位置不同。
Cyclic strain hardening and saturation behavior of double - slip - oriented single Crystals were investigated at constant plastic shear strain amplitude (γpl) in the range of 1.3×10-4－7.2×10-3. For γpl ＜ 2×10-3, the initial hardening rates θ0.2 are low and almost independent of γpl. For γpl＞ 2×10-3, θ0.2 increases notably with increasing γpl. The cyclic stress-strain (CSS) curve of crystal exhibits a clear plateau region over the plastic strain range of 5. 0 × 10 -4－4.0×10 -3, which is shorter than that of the single slip crystal (6.0×10-5－7.5× 10-3) although the saturation shear stresses are nearly the same. Even though the orientations of and crystals are on the same 001/111 boundary in the standard stereographic triangle, their cyclic deformation behaviors are quite different, such difference is mainly attributed to the rather different slip deformation characteristics induced by the different geometrical relationships between crystal orientations and corresponding slip systems for these two crystals.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第8期864-869,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金!19392300-4
关键词
铜单晶体
双滑移
循环硬化
循环形变
循环饱和
copper single crystal, double slip, cyclic strain hardening and saturation, cyclic stress-strain curve
