Abstract

Although Ni-rich 60 NiTi shape memory alloy (SMA) shows superior properties, it is difficult to process due to its high hardness and studies on the manufacturing method are still needed. By the hot isostatic pressing process (HIP), parts close to the net shape are produced and the second operation may no longer be required. In this study, the effects of mechanical alloying on NiTi alloy produced by the HIP process were investigated. The starting powders of the first group were mechanically alloyed. The starting powders of the second group were mechanically mixed. Afterwards, the microstructures, transformation temperatures and some mechanical properties of these two groups were compared. For these examinations, SEM-EDS, XRD, DSC analyzes and microhardness measurement, density measurement by hydrostatic weighing method were performed. The result showed, mechanical alloying causes a more homogeneous microstructure and higher transformation temperatures.

中文翻译：

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机械合金化对热等静压富镍镍钛形状记忆合金的影响

摘要

虽然富Ni 60 NiTi形状记忆合金（SMA）具有优异的性能，但由于其硬度高而难以加工，仍需要对其制造方法进行研究。通过热等静压工艺（HIP），可以生产接近最终形状的零件，并且可能不再需要第二道工序。在这项研究中，研究了机械合金化对 HIP 工艺生产的 NiTi 合金的影响。第一组的起始粉末是机械合金化的。第二组的起始粉末机械混合。随后，比较了这两组的显微组织、转变温度和一些力学性能。对于这些检查，进行了 SEM-EDS、XRD、DSC 分析和显微硬度测量，通过静水称重法进行密度测量。