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采用原位纳米测试系统对氮离子注入前后的Ti6Al4V合金试样进行纳米压痕实验,研究材料纳米硬度的载荷相关性和尺寸效应,及其在纳米尺度下材料的塑性变形过程。结果表明:纳米硬度具有明显的载荷相关性,在临界载荷Fc以下,随着载荷的增加纳米硬度呈线性增加;在临界载荷Fc以上,随着载荷的增加纳米硬度呈非线性减小,并稳定在一个值上。此外,纳米硬度随着压入深度的增加而减小,并且Ti6Al4V合金的纳米硬度极限载荷FH和稳定纳米硬度Hs分别为550μN和5.6GPa,而经过氮离子注入后的Ti6Al4V合金的纳米硬度极限载荷FH和稳定纳米硬度Hs分别提高到700μN和6.7 GPa。
The in-situ nano-test system was used to conduct nano-indentation experiments on Ti6Al4V alloy samples before and after nitrogen ion implantation. The load dependence and size effect of the nano-hardness of the material were investigated. The plastic deformation process of the Ti6Al4V alloy was also studied. The results show that the nano-hardness has obvious load dependence. Under the critical load Fc, the nano-hardness increases linearly with the increase of load. Above the critical load Fc, the nano-hardness decreases non-linearly with the increase of load and is stable On a value. In addition, the nano-hardness decreases with the increase of the depth of indentation, and the ultimate hardness of nanohardness FH and stable nano-hardness Hs of Ti6Al4V alloy are 550μN and 5.6GPa, respectively. However, the nano-hardness ultimate load of Ti6Al4V alloy after nitrogen ion implantation FH and stable nano-hardness Hs increased to 700μN and 6.7 GPa respectively.