Trial Production of Heterogeneous Nano–Structured Cu–Be Alloy Conforming to Super–High–Pressure Hydrogen Gas Valve Case

DOI
  • Miura Hiromi
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Oba Yojiro
    Department of Mechanical Engineering, Toyohashi University of Technology
  • Muramatsu Naokuni
    Engineering and R&D, New Metals Div., NGK Insulators, LTD.

Bibliographic Information

Other Title
  • ヘテロナノ組織Cu–Be合金の超高圧水素ガス適合バルブケース用材の試作

Abstract

<p>Rectangular–shaped bulky Cu–Be alloy was multi–directionally forged (MDFed) at ambient temperature. While coarse initial grains were gradually fragmented by mechanical twinning with increasing forging cumulative strain, grain fragmentation appeared more proceeded at surface–edge and inner–central regions than at surface–central and inner–edge ones of the MDFed sample. The hardness Hv, therefore, changed much depending on position from 2.69 GPa to 3.02 GPa at cumulative strain of ΣΔε=2.4. Hence, ultimate tensile strength (UTS) showed same tendency that the UTS at the inner–central region (962 MPa) was larger than that at the other regions (818 MPa), i.e., 15％ difference. Nevertheless, the difference in the UTS became much smaller to be 1.39 GPa at maximum and 1.32 GPa at minimum, i.e., 5％ difference, after peak aging at 513 K without showing large difference in the ductility around 4％, which should be due to the difference in the age–hardenability depending on microstructure.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390579532134903168
  • DOI
    10.34562/jic.62.1_73
  • ISSN
    2435872X
    13477234
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Allowed

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