固溶时效Cu-Cr-Zr合金拉伸断裂行为分析

Analysis of Tensile Fracture Behavior of Cu-Cr-Zr Alloy After Solid Solution and Ageing Treatment

利用拉伸试验机、金相显微镜以及扫描电镜研究了Cu-Cr-Zr合金的组织,以及在不同拉伸速率条件下的断面收缩率和断口形貌。结果表明,随着应变速率提高,断面收缩率逐渐降低。Cu-Cr-Zr合金固溶时效处理后晶粒为等轴晶,晶粒尺寸较大,第二相颗粒弥散分布。Cu-Cr-Zr合金的拉伸断口可分为韧窝区和撕裂区两部分;随着拉伸速率提高,韧窝数量减少且韧窝变浅。

Microstructure of Cu-Cr-Zr alloy, as well as reduction of area and frac~_re morphology under different tensile strain rate were studied by tensile testing machine, metallographic microscope and scanning electron microscope. The results show that the reduction of area of the alloy decreases with the increasing of strain rate. After solid solution aging treatment, the mierostructure is composed of equiaxed grains, the grain size is larger, and the second phase particles are dispersed in the alloy. The fracture morphology of Cu-Cr-Zr alloy is mainly manifested in the two parts of the tough zone and the tearing area. With the increase of the tensile rate, the quantity of the toughening nests reduce and the toughening nests are relatively shallow.