Investigation on Additional Hardening Mechanisms in Off-Stoichiometric Al-Rich Ni<sub>3</sub>Al Alloys in Terms of Anti-Site Defect Configuration
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<jats:title>ABSTRACT</jats:title><jats:p>One of the unsettled issues of the mechanical properties of L1<jats:sub>2</jats:sub>-Ni<jats:sub>3</jats:sub>Al 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 Ni<jats:sub>3</jats:sub>Al 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.</jats:p>
収録刊行物
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- MRS Proceedings
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MRS Proceedings 753 2002-01-01
Springer Science and Business Media LLC
