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论文类型：期刊论文

发表时间：2018-06-01

发表刊物：ACTA METALLURGICA SINICA-ENGLISH LETTERS

收录刊物：SCIE

卷号：31

期号：6

页面范围：604-614

ISSN号：1006-7191

关键字：beta-Type titanium alloy; Pre-cold rolling; Twinning deformation; Isothermal omega-phase; Strength-ductility

摘要：This paper reported an effectiveness of pre-cold rolling-induced {332}<113> twins combined with subsequent isothermal x-phase formation for enhancement of uniform elongation in a beta-type Ti-15Mo alloy with high yield strength level. Mechanical {332}<113? twins were induced by cold rolling with an thickness reduction of 5%, which had little effect on x-phase precipitation after aging at 573 K for 3.6 ks. Twinning after the cold rolling was further activated during tensile deformation, even with the presence of isothermal omega-phase. This combination of twins and omega-phase enhanced uniform elongation from 0 to 9% at yield strength level of 890 MPa. The high yield strength was mainly dominated by dislocation slip due to the isothermal x-phase formation, and early onset of plastic instability after yielding was hindered due to the pre-cold rolling-induced twins. Dynamic microstructural refinement was induced by further twinning activation during deformation, which resulted in high work hardening rate corresponding enhancement of uniform elongation.