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本文在一个较宽的塑性应变幅范围（γpl=1.1×10-4-7．2×10-3）内研究了[011]多滑移取向铜单晶体的循环形变行为.结果表明，[011]晶体的循环形变行为明显不同于[011]和[111]多滑移取向的铜单晶体.[011]晶体具有较低的初始硬化速率，即使在较高的塑性应变幅下，初始硬化速率也无明显变化.［011］晶体的循环应力-应变曲线（CSSC）在所研究的塑性应变幅范围内呈现平台区.CSSC上是否存在平台区，主要由晶体本身的滑移特点和相应的位错反应所决定.疲劳滞后回线形状参数VH在某种程度上可用于确定[011]多滑移铜单晶体的PSB萌生应力
In this paper, the cyclic deformation behavior of [011] multi-slip oriented single crystal was studied in a wide range of plastic strain amplitude (γpl = 1.1 × 10-4-7.2 × 10-3). The results show that [011] The cyclic deformation behavior of the crystal is significantly different from that of [011] and [111] multi-slip oriented copper single crystals. [011] The crystals have a lower initial hardening rate and have a lower initial hardening rate even at higher plastic strain amplitudes (CSSC) presents a plateau region within the range of plastic strain amplitude studied.The existence of plateau region on CSSC mainly depends on the slip characteristics of the crystal itself and the corresponding dislocation reaction The fatigue hysteresis loop shape parameter VH can be used to some extent to determine the PSB initiation stress of [011] multi-slip copper single crystals