Spark Sintering of TiB₂ Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations

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  • Ke Yujiao
    Graduate School of Engineering, Hiroshima University
  • Matsugi Kazuhiro
    Graduate School of Engineering, Hiroshima University
  • Xu Zhefeng
    Graduate School of Engineering, Hiroshima University State Key Laboratory of Metastable Material Science and Technology, Yanshan University
  • Choi Yongbum
    Graduate School of Engineering, Hiroshima University
  • Wang Mingzhi
    State Key Laboratory of Metastable Material Science and Technology, Yanshan University
  • Yu Jinku
    State Key Laboratory of Metastable Material Science and Technology, Yanshan University

書誌事項

タイトル別名
  • Spark Sintering of TiB<sub>2</sub> Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations
公開日
2020-03-01
資源種別
journal article
DOI
  • 10.2320/matertrans.mt-m2019286
公開者
公益社団法人 日本金属学会

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説明

<p>TiB2 reinforced Fe matrix composites were investigated for their potential as a new generation of hot work tools which are mainly characterized by high thermal conductivity and high hardness in comparison with conventional materials. In this work, Fe–30 vol%TiB2 composites were sintered at 1373 K for different holding times (0, 0.3, 0.6, 1.8 and 3.6 ks). Apart from Fe and TiB2, newly formed phases of Fe2B and TiC were found in all sintered compacts. A good Fe/TiB2 interfacial cohesion was confirmed at atomic level at 0 ks, which was due to the occurrence of the special orientation relationship between {110} planes of Fe and {1010} planes of TiB2. The observation of dislocations in TiB2 particles, attributed to the activation of slip systems, showed the plastic deformation ability of TiB2 at high temperature. The reaction between Fe and TiB2 was due to TiB2 dissolution in Fe at 1373 K and different diffusion depth of B and Ti atoms in Fe. Consequently, B directly reacted with Fe, since the solubility of B atoms was low in both α-Fe and γ-Fe. TiC probably precipitated from Fe–Ti–C solid solution along Fe grain boundaries in the cooling stage after sparking sintering, leading to a layer of Fe wrapping around TiB2. Among all the compacts, the one sintered at 1373 K for 0.6 ks displayed the excellent properties which were comparable in Vickers hardness and 133% higher in thermal conductivity, compared with that of SKD61 as the commonly used practical material. This work provides a new perspective to fabricate a future generation of hot work tools.</p>

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (3), 548-556, 2020-03-01

    公益社団法人 日本金属学会

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