【摘要】 采用纳米压痕连续刚度技术(CSM)对铝合金在不同压痕深度以及不同压头半径下的力学响应进行分析。通过不同分析方法将载荷-压痕深度关系转换为压痕应力-应变(σ-ε)关系，并与宏观性能对比得到最优方法。结果表明，半径为250μm的压头在最大压痕深度为550 nm时测得的平均弹性模量为66.4 GPa,其值与宏观拉伸弹性模量相差2.3%;采用限制因子1.6作为应力转换系数，通过几何接触半径与Tabor方法相结合可得到准确的塑形性能，名义屈服应力为290 MPa,与宏观拉伸屈服应力误差约为1.4%。更多还原

【Abstract】 The mechanical responses of aluminum alloys at different indentation depths and different radius of indenter were analyzed using nanoindentation continuous stiffness method(CSM). The indentation stress-strain(σ-ε) relationship is transformed from the load-indentation depth relationship through different analysis methods, and the optimal method is obtained by comparing with macroscopic properties. The results show that the average elastic modulus measured by indenter with radius of 250 μm at the maximum indentation depth of 550 nm is 66.4 GPa, which is 2.3% different from the macroscopic tensile elastic modulus. The accurate plastic properties can be obtained by combining geometric contact radius with Tabor strain formulas when the constraint factor 1.6 was used as the stress conversion coefficient. The nominal yield stress is 290 MPa, which is about 1.4% deviation from the macroscopic tensile yield stress.更多还原