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首页> 外文期刊>Journal of Materials Research >The effect of acetylene as a dielectric on modification of TiNi-based shape memory alloys by dry EDM
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The effect of acetylene as a dielectric on modification of TiNi-based shape memory alloys by dry EDM

机译：乙炔作为电介质对干式EDM改性TiNi基形状记忆合金的影响

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摘要

This study modified the surfaces of three kinds of TiNi-based shape memory alloys (SMAs) by dry electrical discharge machining (EDM) in nitrogen (N_2) and acetylene (C_2H_2) gas mixture. The effects of composition of the dielectric medium and work-piece on the machining performance and surface characteristics were investigated. Increasing the ratio of acetylene gas in gas mixture was beneficial for improving the material removal rate (MRR). However, adding a large amount of acetylene gas resulted in unstable discharge. A recast layer, comprising nitrides and carbides, which well adhered on the EDMed surface exhibited high hardness. Among Ti_(50)Ni_(50), Ti_(50)Ni_(49.5)Cr_(0.5), and Ti_(40.5)Ni_(49.5)Zr_(10) SMA as a work-piece, Ti_(40.5)Ni_(49.5)Zr_(10) SMA has the lowest MRR owing to it possessed the highest melting temperature and thermal conductivity. The recast layer on Ti_(40.5)Ni_(49.5)Zr_(10) SMA, comprising zirconium nitride, exhibited the highest hardness and adhesion among all the SMAs. However, the high-hardness recast layer deteriorated the shape recovery of the SMA.
机译：本研究通过在氮气（N_2）和乙炔（C_2H_2）混合气体中进行干放电加工（EDM）来修饰三种TiNi基形状记忆合金（SMAs）的表面。研究了介电介质和工件的组成对加工性能和表面特性的影响。增加乙炔气体在混合气体中的比例有利于提高材料去除率（MRR）。但是，添加大量的乙炔气体导致放电不稳定。很好地粘附在EDM表面上的包括氮化物和碳化物的重铸层表现出高硬度。 Ti_（50）Ni_（50），Ti_（50）Ni_（49.5）Cr_（0.5）和Ti_（40.5）Ni_（49.5）Zr_（10）SMA作为工件，Ti_（40.5）Ni_（49.5） Zr_（10）SMA的MRR最低，因为它具有最高的熔化温度和热导率。 Ti_（40.5）Ni_（49.5）Zr_（10）SMA上的重铸层包含氮化锆，在所有SMA中表现出最高的硬度和附着力。然而，高硬度重铸层使SMA的形状恢复恶化。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3484-3492|共9页
  • 作者

    Tyau-Song Huang; Shy-Feng Hsieh; Sung-Long Chen; Ming-Hong Lin; Shih-Fu Ou; Wei-Tse Chang;

  • 作者单位

    Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

    Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

    Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

    Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

    Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

    Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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