Rapid solution hardening at elevated temperatures by substitutional Re alloying in MoSi2
作者： A. Misra , A.A. Sharif , J.J. Petrovic , T.E. Mitchell
DOI: 10.1016/S1359-6454(99)00380-8
关键词: Thermodynamics 、 Hardening (metallurgy) 、 Microstructure 、 Materials science 、 Intermetallic 、 Solid solution strengthening 、 Dislocation 、 Crystallographic defect 、 Rhenium 、 Metallurgy 、 Tetragonal crystal system
摘要: Abstract The mechanical properties of solidification processed polycrystalline MoSi2 and ternary (Mo, Re)Si2 alloys were evaluated by compression testing at elevated temperatures. Rhenium is found to be a potent solid solution hardening addition C11b temperatures up 1600°C (highest temperature used in the study). Dislocation microstructures, characterized electron microscopy, are consistent with significant exhibited Re containing alloys. high rate cannot explained classical substitutional theories for metals based on atomic size misfit elastic moduli mismatch. Since rhenium “disilicide” semiconducting has Si-deficient stoichiometry ReSi1.75, may lead formation constitutional Si vacancies which pair substitutionals form point defect complexes. A model that describes elliptical strain field (tetragonal distortion) around these defects interpret rapid MoSi2. Small additions provide necessary strength MoSi2-based structural intermetallic very applications (∼1200–1600°C).
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