The influence of the load on the elastic modulus in a polycrystalline age-hardenable Cu-2Be (wt%) alloy with different microstructures was studied. Nanoindentation measurements were carried out on homogenized samples (α phase), aged for 1 h at 400 C (α phase with γ′ precipitates) and aged for 10 h at 400 C (α phase with γ precipitates). A sample of α Cu was also studied to compare its behavior with the values of the Cu-2Be specimens. The surface of the samples after unloading was analyzed by AFM images and the specimens with nanoprecipitates showed the presence of pile-up. The elastic modulus was estimated from the load-depth curves carried out at different maximum loads, using the Oliver and Pharr method and the method of the indentation work. From the Oliver and Pharr method, the modulus decreases with increasing maximum load, but this variation is reduced using the estimation by the indentation work method in some of the studied samples. Even so, a dependence of the modulus with the load is observed, especially in the α Cu-2Be sample and in the sample with γ′ nanoprecipitates.

研究了载荷对具有不同微观结构的多晶时效硬化 Cu-2Be (wt%) 合金弹性模量的影响。纳米压痕测量在均质样品（α相）上进行，在 400 C 下时效 1 小时（α相与γ '沉淀物）并在 400 C 下时效 10 小时（α相与γ沉淀物）。α的样本还研究了 Cu 以将其行为与 Cu-2Be 样品的值进行比较。卸载后的样品表面通过 AFM 图像分析，带有纳米沉淀物的样品显示存在堆积。使用 Oliver 和 Pharr 方法以及压痕工作方法，根据在不同最大载荷下进行的载荷深度曲线估算弹性模量。根据 Oliver 和 Pharr 方法，模量随着最大载荷的增加而降低，但在某些研究样品中，使用压痕功法估计可以减少这种变化。即便如此，观察到模量与负载的相关性，尤其是在α Cu-2Be 样品和具有γ ' 纳米沉淀物的样品中。