Defect structures and phase transitions of FeRh alloys deformed at high speed deformation

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2003-06, Vol.350 (1), p.139-144
• Main Authors: Oshima, Ryuichiro, Hori, Fuminobu, Kibata, Yasunori, Komatsu, Masao, Kiritani, Michio
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; High-speed impact compression; Iron–rhodium alloy; Materials science; Other heat and thermomechanical treatments; Physics; Positron annihilation; Solid-solid transitions; Specific phase transitions; Stress-induced phase transition; Transmission electron microscopy; Treatment of materials and its effects on microstructure and properties
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(02)00715-3

Fe–Rh alloys of Rh concentrations ranging from 40 to 50at.% and of B2 phase were deformed by use of a compression machine capable of running tests at high speeds of impact. Induced complicated substructures and phases were examined by X-ray diffraction (XRD), transmission electron microscopy (TEM), and positron annihilation spectroscopy (PAS). A characteristic arrangement of L1 0 domains was observed, along with very small transformed A1 domains and dispersed in the residual B2 matrix. On the basis of the experimental results, we suggest a coupling of a pair of shears along {112}〈11−1〉 B2 for the transformation mechanisms from B2 to L1 0 and A1 phases.