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论文类型：期刊论文

发表时间：2017-08-01

发表刊物：METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：48A

期号：8

页面范围：3912-3919

ISSN号：1073-5623

摘要：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.