1996 | OriginalPaper | Buchkapitel
Defect Structures
verfasst von : M. Yamaguchi, Y. Shirai
Erschienen in: Physical Metallurgy and processing of Intermetallic Compounds
Verlag: Springer US
Enthalten in: Professional Book Archive
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In the early 1900s, many binary combinations of metals that form inter-metallic compounds were found. Since then, the mechanical properties of these compounds have been studied mainly from their theoretical implications and requirements to understand the mechanical properties of inter-metallic compounds existing as secondary phases in many alloys used as structural materials. As a result of these efforts, various new findings on the lattice defects and properties of intermetallic compounds were made. Among them were discoveries of (a) the complications introduced by heat treatment in the property/composition relationships of some intermetallic compounds, later leading to the finding of ordered structures formed from solid solutions disordered at high temperatures (Kurnakov, Zhemchuznii, and Zasedatelev 1916); (b) the brittleness of intermetallic compounds in general at temperatures lower than 0.7 Tm (Tm: melting temperature) (Tamman and Dahl 1923); (c) the effect of compositional deviation from stoichiometry on hardness and flow stress; (d) the existence of antiphase boundaries and antiphase domains (Smith 1943); (e) the existence of superlattice dislocations traveling in pairs or groups in ordered lattices (Koehler and Seitz 1947; Marcinkowski, Brown, and Fisher 1961; Marcinkowski 1963); (f) the anomalous temperature dependence of hardness of Ni3Al (Westbrook 1957).