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Effect of Pre-cold Rolling-Induced Twins and Subsequent Precipitated omega-Phase on Mechanical Properties in a beta-Type Ti-Mo Alloy
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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.

程从前

副教授   博士生导师   硕士生导师

任职 : 院长助理,中国腐蚀与防护学会高温专业委员会委员,中国机械工程学会理化检验分委员会委员,辽宁省化工学会腐蚀与防护专业委员会委员

性别: 男

毕业院校:大连理工大学

学位: 博士

所在单位:材料科学与工程学院

学科:材料学

电子邮箱:cqcheng@dlut.edu.cn

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