研究了［123］Cu－16％Al单晶在不同塑性应变幅下的循环形变行为结果表明，试样在整个循环过程中表现出较低的硬化率，且几乎与应变幅大小无关在γp1＝5．3×10－5－64×10－4范围内，循环最大切应力和循环最小切应力几乎与应变幅无关，当γp1＞6．4×10－4时，表现为缓慢硬化随着应变突发的发生，滑移带逐渐增多，在低应变幅γp＝5．3×10－5下驻留Luders带（PLB）不均匀，存在局部无形变区；在其它塑性应变幅下，驻留Luders带均匀分布于试样的整个标距 The cyclic deformation behavior of [123] Cu-16% Al single crystal under different plastic strain amplitude was studied. The results show that the sample shows lower hardening rate in the whole cycle and almost has no relation with the strain amplitude. Γp1 = In the range of 5.3 × 10-5-64 × 10-4, the maximum cyclic shear stress and cyclic minimum shear stress are almost independent of the strain amplitude. When γp1> 6.4 × 10-4, it shows a slow hardening with strain In the event of sudden onset, the slip band gradually increased, and the PLBs were not uniform at low strain amplitude γp = 5.3 × 10-5. There was a local non-deformable zone. At other plastic strain amplitude, Luders with uniform distribution throughout the sample gauge length