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对经980℃×1 h固溶+460℃×4 h时效处理后的Cu-0.88Cr合金进行了多道次连续拉拔变形,通过拉伸试验获得了不同应变条件下Cu-0.88Cr合金断面收缩率的变化规律,并利用扫描电镜观察了Cu-0.88Cr合金断口形貌,揭示了Cu-0.88Cr合金断面收缩率与断口形貌的内在关联。结果表明:Cu-0.88Cr合金断口形貌与断面收缩率密切相关。随着应变量从0增加到4.9,断面收缩率从44%增加到68%并后续基本保持不变,合金断裂形式由等轴韧窝+撕裂转变为等轴韧窝+抛物线韧窝,并最终过渡到抛物线韧窝。进一步地,合金断口形貌的变化受微观组织中滑移带影响,随着应变量增加(0~4.9),滑移带的数量、形态和方向发生明显变化。
The Cu-0.88Cr alloy after aging at 980 ℃ for 1 h and the aging treatment at 460 ℃ for 4 h were subjected to multi-pass continuous drawing and drawing. The tensile strength of Cu-0.88Cr alloy under different strain conditions Shrinkage rate of Cu-0.88Cr alloy. The fracture morphology of Cu-0.88Cr alloy was observed by scanning electron microscopy. The correlation between the cross-sectional shrinkage and fracture morphology of Cu-0.88Cr alloy was revealed. The results show that the fracture morphology of Cu-0.88Cr alloy is closely related to the reduction of area. As the strain increases from 0 to 4.9, the reduction of area decreases from 44% to 68% and remains largely unchanged. The fracture pattern changes from equiaxed dimple + tearing to equiaxed dimple + parabolic dimple, and The final transition to a parabolic dimple. Further, the change of the fracture morphology of the alloy is affected by the slip band in the microstructure. With the increase of the strain amount (0 ~ 4.9), the number, shape and direction of the slip band change obviously.