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The temperature dependence of the long‐range order parameter of Ni 3 Al
Author(s) -
Pope D. P.,
Garin J. L.
Publication year - 1977
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889877012709
Subject(s) - atmospheric temperature range , materials science , stoichiometry , range (aeronautics) , thermodynamics , extinction (optical mineralogy) , yield (engineering) , constant (computer programming) , order (exchange) , condensed matter physics , analytical chemistry (journal) , metallurgy , mineralogy , chemistry , composite material , physics , chromatography , finance , computer science , economics , programming language
The macroscopic yield stress of Ni 3 Al increases rapidly with temperature, reaching a maximum at about 700°C. Such anomalous behavior has been observed in other ordered alloys which undergo partial disordering with increasing temperature, e.g . Cu 3 Au. The long‐range order parameter, S , of stoichiometric Ni 3 Al powder was measured over the temperature range 25°C to 1000°C and great care was taken to ensure a fine particle size and thus avoid extinction effects. The results of this study showed that, in Ni 3 Al, S remains constant at about 0.93 over the entire temperature range investigated. This means that theories relating the strength of ordered alloys to S are not applicable to Ni 3 Al.