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Indexed by:期刊论文

Date of Publication:2017-08-01

Journal:METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:48A

Issue:8

Page Number:3912-3919

ISSN No.:1073-5623

Abstract:beta-Ti alloys with low Young's modulus are always formed at the lower critical limit of beta stabilization, where the beta structure is prone to be destabilized. This present work aims at studying the structural stability of beta-Ti alloy [(Mo0.5Sn0.5)-(Ti13Zr1)]Nb-1 with low Young's modulus (E) at different states of suction-cast (SC) and solution-treated (ST), and the deformation mechanisms of this alloy are also discussed. The solution treatment eliminates the composition heterogeneity of the SC alloy, and no second phases are precipitated from the beta matrix, as a result of a further decrease of E from 48 GPa (SC) to 43 GPa (ST). After tension deformation, the stress-induced {112} beta twinning is dominant in the SC alloy, while the stress-induced phase transformation of beta -> alpha aEuro(3) plays a decisive role in the ST alloy, which results from the different structural stabilities of beta matrix at different states. The minor second-phase precipitation renders the matrix with a slightly higher beta stability of the SC alloy than that of the ST one.