个人信息Personal Information
副教授
硕士生导师
性别:女
毕业院校:德国布伦瑞克工业大学
学位:博士
所在单位:材料科学与工程学院
办公地点:教育部三束材料改性实验室4号楼311
联系方式:手机:13664242540;电话:84709780
电子邮箱:xiangli@dlut.edu.cn
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.