剧烈塑性变形铜锌合金的纳米压痕性能研究

Study on Mechanical Properties of Severe Plastic Deformed Cu-Zn Alloy Based on Nano-indentation

采用室温扭转试验对Cu-Zn合金进行剧烈塑性变形,并利用纳米压痕技术对扭转不同圈数的Cu-Zn合金热处理后的力学性能开展研究。基于Oliver-Pharr模型和量纲分析获得Cu-Zn合金在不同扭转圈数下的杨氏模量、硬度、屈服应力与应变硬化指数。结果表明,随着扭转圈数增加,Cu-Zn合金平均晶粒尺寸逐渐减小;在相同的扭转圈数下,轴向平均晶粒尺寸小于径向晶粒尺寸。合金的显微硬度和杨氏模量随载荷的增加而减小。基于量纲分析获得的合金平均屈服强度为0.099 GPa,平均应变硬化指数为0.26,与试验测试结果基本符合。

Severe plastic deformation of Cu-Zn alloy was carried out by using room temperature torsion test,and the mechanical properties of Cu-Zn alloy with different torsion turns after heat treatment were investigated by nano-indentation technology.The Yong's modulus,hardness,yield stress and strain hardening index of the Cu-Zn alloy under different torsion turns were calculated based on Oliver-Pharr model and dimensional analysis.The results show that with the increase of torsion turn,the average grain diameter of Cu-Zn alloy decreases.Under the same torsion turn,the axial average grain size of Cu-Zn alloy is smaller than that of radial grain size.The microhardness and Young's modulus of the alloy decrease with the increase of the load.Based on dimensional analysis,the average yield strength of the alloy is 0.099 GPa and the average strain hardening index is 0.26,which is basically consistent with the test results.