Investigation on additional hardening mechanisms in off-stoichiometric Al-rich Ni3Al alloys in terms of anti-site defect configuration

Seiji Miura, Satoshi Takizawa, Yoshinao Mishima, Tetsuo Mohri

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

One of the unsettled issues of the mechanical properties of L1 2-Ni3Al compound is the effect of off-stoichiometry on the 0.2% flow stress at low temperature region. 0.2% flow stress at 77 K increases as deviating from the stoichiometric composition to both Ni-rich and Al-rich sides, but in Al-rich side the increasing rate is higher. According to the XRD results for the binary Ni3Al alloys, however, the composition dependence of the lattice constant is the same in both sides of the stoichiometric composition, which implies that the magnitude of lattice strain induced at off-stoichiometric composition is symmetrical. And it is not rational to associate the strengthening mechanism to a sole effect of isotropic strain due to an atomic size difference. In this study, attempts are made to explain the additional strengthening in Al-rich alloys in terms of the tetragonal distortion hardening mechanism, which arises from anisotropic atomic configuration around an anti-site Al atom.

本文言語English
ページ(範囲)33-38
ページ数6
ジャーナルMaterials Research Society Symposium - Proceedings
753
出版ステータスPublished - 2003 11 10
イベントDefect Properties and Related Phenomena in Intermetallic Alloys - Boston, MA, United States
継続期間: 2002 12 32002 12 5

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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