A hierarchical nanolamella-structured alloy with excellent combinations of tensile properties

详细信息    查看全文

• 作者：Ming Li^a ; ^b ; Defeng Guo^a ; Tengyun Ma^a ; Yindong Shi^a ; Guosheng Zhang^a ; Xiangyi Zhang^a ; ^{xyzh66@ysu.edu.cn" class="auth_mail}
• 关键词：Hierarchical structure ; Ductility ; Severe plastic deformation ; Cold deformation
• 刊名：Materials Science and Engineering: A
• 出版年：12 June 2014
• 年：2014
• 卷：606
• 期：Complete
• 页码：396-400
• 全文大小：1788 K

文摘

Dual phase (伪+尾)-Ti alloys with a fully fine laminated microstructure usually exhibit a high strength but a limited ductility. In the present study, a hierarchical nanolaminated microstructure consisting of lamellae with nano- and submicrometer-sized widths has been produced in a TiZrAlV alloy by employing severe plastic deformation (SPD) combined with subsequent thermal annealing. The hierarchical nanolamella-structured Ti alloy exhibits excellent combinations of tensile properties, e.g., an ultimate tensile strength 蟽_UTS=1600 MPa and an elongation to failure 蔚_f=6.5%. The high strength can be attributed to the formation of a lot of nanoscale 伪 lamellae in the alloy, and the enhanced ductility results mainly from both the coarse 伪 lamellae that have a high strain hardening capability and the complex strain paths caused by a hierarchical nanolaminated structure.