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首页> 外文期刊>Journal of Materials Processing Technology >Surface modification of TiNi-based shape memory alloys by dry electrical discharge machining
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Surface modification of TiNi-based shape memory alloys by dry electrical discharge machining

机译：干放电加工对TiNi基形状记忆合金的表面改性

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摘要

This study attempts to decrease the martensite transformation temperature of Ti50Ni50 shape memory alloy (SMA) for its use in biomedical applications by Cr addition. In addition, surface modification of Ti50Ni50 and Ti50Ni49.5Cr0.5 SMAs using electrical discharge machining (EDM) is proposed. Nitrogen gas is used as a dielectric medium, and a pure titanium pipe is used as the tool electrode. The machining characteristics and surface properties of Ti50Ni50 and Ti50Ni49.5Cr0.5 SMAs after EDM in nitrogen gas were investigated. Many electrical discharge craters and recast materials are observed on the EDMed surface of these SMAs. Material removal rate, electrode wear rate, and surface roughness increase with increasing pulse current and duration, and they share an inverse relationship with the thermal conductivity of these SMAs. After EDM, the SMAs continue to exhibit good shape recovery, and even the recast layers have high surface hardness. The recast layers, comprising TiN and CrN, with high hardness and good adhesion are expected to improve the SMAs' wear and corrosion resistance. (C) 2015 Elsevier B.V. All rights reserved.
机译：这项研究试图通过添加Cr来降低Ti50Ni50形状记忆合金（SMA）在生物医学中的马氏体转变温度。此外，提出了利用放电加工（EDM）对Ti50Ni50和Ti50Ni49.5Cr0.5 SMA进行表面改性的方法。氮气用作电介质，纯钛管用作工具电极。研究了氮气中电火花加工后Ti50Ni50和Ti50Ni49.5Cr0.5 SMA的加工特性和表面性能。在这些SMA的EDMed表面上观察到许多放电坑和重铸材料。材料去除率，电极磨损率和表面粗糙度随着脉冲电流和持续时间的增加而增加，并且它们与这些SMA的热导率成反比关系。在电火花加工之后，SMA继续表现出良好的形状恢复性，甚至重铸层也具有高表面硬度。包括TiN和CrN在内的重铸层具有较高的硬度和良好的附着力，有望改善SMA的耐磨性和耐腐蚀性。 （C）2015 Elsevier B.V.保留所有权利。

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