Carbon stabilized A15 Cr3Re precipitates and ductility enhancement of Cr-based alloys |
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Affiliation: | 1. Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund-Platz 1, Göttingen 37077, Germany;2. Universite Libre de Bruxelles (ULB), Interdisciplinary Center for Nonlinear Phenomena and Complex Systems, Campus Plaine, CP 231, Blvd. du Triomphe, Brussels B-1050, Belgium;3. Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USA;4. National Research University Higher School of Economics, Moscow 101000, Russia |
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Abstract: | A new metastable A15 phase in the Cr–Re system is predicted based on full-potential linear muffin-tin orbital (FLMTO) calculations of its electronic structure and cohesive properties. While A15 Cr3Re is unstable as a bulk compound, we demonstrate that nonstoichiometry and carbon impurities play a dominant role in stabilizing this phase and may lead to the occurrence of A15 type particles in Cr-based alloys. Thus, these A15 precipitates may scavenge carbon impurities and prevent the formation of brittle carbides and, additionally, provide an obstacle for dislocation motion. The formation of small close-packed particles appear to explain the improvement of both ductility and strength and is most likely the mechanism of the “rhenium effect” in Cr (W, Mo) based alloys. |
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