High Temperature Deformation of a Fine-Grained and Particle-Dispersed V-2.3%Y-4%Ti-3%Mo Alloy

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著者

    • NAKAI Kiyomichi
    • Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
    • ARAKAWA Hideo
    • International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
    • MATSUI Hideki
    • International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

抄録

The high temperature deformation behavior of a fine-grained and particle-dispersed V-2.3%Y-4%Ti-3%Mo (mass%) alloy was investigated. The alloy was fabricated by powder metallurgical methods utilizing mechanical alloying and hot isostatic pressing (HIP), followed by annealing at 1273 K for 3.6 ks. Tensile tests were performed at temperatures from 873 to 1273 K at initial strain rates from 2.5×10<SUP>−5</SUP> to 1.0×10<SUP>−1</SUP> s<SUP>−1</SUP>. X-ray diffraction analyses show that the HIPed and annealed specimens contain a significant amount of (Y, Ti)<SUB>2</SUB>O<SUB>3</SUB> and small amounts of YN, Ti<SUB>2</SUB>O<SUB>3</SUB> and TiO. Transmission electron microscopy observations show that the matrix contains approximately 3%Ti and 3%Mo in solution and that the average diameters of the matrix grains and dispersoids are about 620 and 42 nm, respectively. Tensile test results show that the yield stress depends strongly on test temperature and strain rate. From the dependence of the yield stress measured at 1073 and 1273 K on plastic strain rate, it is found that the dependence is divided into three regions with different deformation controlling mechanisms: a recovery controlling process of a long range internal stress field associated with dispersed particle (the high-strain-rate region), grain boundary sliding (the medium-strain-rate region) and presumably solute atmosphere dragging (the low-strain-rate region). Effects of 4%Ti addition on the microstructures and high temperature deformation behavior are discussed.

収録刊行物

  • Materials transactions  

    Materials transactions 47(10), 2497-2503, 2006-10-20 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10018310213
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    8092057
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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