Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1576530 | Materials Science and Engineering: A | 2013 | 12 Pages |
Abstract
Room temperature and elevated temperature mechanical properties of four multi-principal element alloys, NbTiVZr, NbTiV2Zr, CrNbTiZr and CrNbTiVZr, are reported. The alloys were prepared by vacuum arc melting followed by hot isostatic pressing and homogenization. Disordered BCC solid solution phases are the major phases in these alloys. The Cr-containing alloys additionally contain an ordered FCC Laves phase. The NbTiVZr and NbTiV2Zr alloys showed good compressive ductility at all studied temperatures while the Cr-containing alloys showed brittle-to-ductile transition occurring somewhere between 298 and 873Â K. Strong work hardening was observed in the NbTiVZr and NbTiV2Zr alloys during deformation at room temperature. The alloys had yield strengths of 1105Â MPa and 918Â MPa, respectively, and their strength continuously increased, exceeding 2000Â MPa after â¼40% compression strain. The CrNbTiZr and CrNbTiVZr alloys showed high yield strength (1260Â MPa and 1298Â MPa, respectively) but low ductility (6% and 3% compression strain) at room temperature. Strain softening and steady state flow were typical during compression deformation of these alloys at temperatures above 873Â K. In these conditions, the alloys survived 50% compression strain without fracture and their yield strength continuously decreased with an increase in temperature. During deformation at 1273Â K, the NbTiVZr, NbTiV2Zr, CrNbTIZr, and CrNbTiVZr alloys showed yield strengths of 58Â MPa, 72Â MPa, 115Â MPa and 259Â MPa, respectively.
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Authors
O.N. Senkov, S.V. Senkova, D.B. Miracle, C. Woodward,