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Nanomechanical properties of hardened 60NiTi

机译：硬化60niti的纳米力学性质

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摘要

The nanomechanical properties of hardened 60NiTi were studied using nanoindentation. The hardened 60NiTi consists of two regions: the NiTi + Ni_4Ti_3 region, which is composed of a B_2 NiTi matrix and nanoscale Ni_4Ti_3 precipitates, and the globular Ni_3Ti precipitates. Blind nanoindentation was first performed on 60NiTi using a diamond Berkovich without differentiating the regions. The two regions were then selectively indented using a diamond cube corner nanoindenter. The results show that the elastic modulus and hardness of the NiTi + Ni_4Ti_3 region were similar to those of bulk 60NiTi. The Ni_3Ti phase was found to have an elastic modulus that is more than double that of bulk 60NiTi and the NiTi + Ni_4Ti_3 region. The hardness was also found to be significantly higher. This study not only provides the first quantitative measurements of the mechanical properties of Ni_3Ti precipitates within 60NiTi but also suggests that the presence of large amounts of easily imaged Ni_3Ti could serve as a good indication of reduced amounts of Ni_4Ti_3, which could lead to lower overall hardness of the material.
机译：使用纳米凸缘研究了硬化60niti的纳米机械性能。硬化的60niti由两个区域组成：Niti + Ni_4Ti_3区域，其由B_2 Niti基质和纳米级Ni_4Ti_3沉淀物组成，并且球状Ni_3Ti沉淀物。首先使用钻石Berkovich在60接壤中进行盲纳米indentation，而不为区域差异。然后使用金刚石立方体角纳米丁烯选择性地缩进两种区域。结果表明，NITI + NI_4TI_3区域的弹性模量和硬度与散装60niti的弹性模量和硬度相似。发现Ni_3TI相具有散装60niti和Niti + Ni_4Ti_3区域的弹性模量。还发现硬度明显高。这项研究不仅提供了Ni_3Ti沉淀物的第一次定量测量沉淀物在60毫升内的沉淀物，而且还表明大量容易成像的Ni_3TI可以作为少量的Ni_4Ti_3的良好指示，这可能导致整体硬度降低材料。

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