Ultrahigh strength and large plasticity of nanostructured Ti62Nb12.2Fe13.6Co6.4Al5.8 alloy obtained by selectively controlled micrometer-sized phases

被引：4
作者：
Liu, L. H. [1 ]
Yang, C. [2 ]
Liu, Z. Y. [3 ]
Zhang, L. C. [4 ]
Zhang, W. W. [2 ]
Huang, X. S. [1 ]
He, L. J. [5 ]
Li, P. J. [1 ]
机构：
[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
[2] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
[3] Shenzhen Univ, Coll Mechatron & Control Engn, Key Lab Adv Mfg Technol Mold & Die, Shenzhen 518060, Peoples R China
[4] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia
[5] Tsinghua Univ, Dept Aerosp Engn, Beijing 100084, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2017年 / 124卷
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
Titanium alloys; Semi-solid sintering; Rapid solidification; Mechanical properties; TI-FE-CO; CU-NI ALLOYS; MECHANICAL-PROPERTIES; DENDRITE COMPOSITE; TENSILE DUCTILITY; ENHANCED PLASTICITY; BULK ALLOYS; NB ALLOYS; MICROSTRUCTURE; SN;
D O I：
10.1016/j.matchar.2017.01.009
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report that the strength and plasticity of Ti62Nb12.2Fe13.6Co6.4Al5.8 alloy can be modulated by selectively controlled micron-sized phases, i.e. beta-Ti phase and twined (CoFe)Ti-2 phase. It is found that the alloy with micron sized beta-Ti phase embedded in nanostructured matrix possesses lower yield strength but higher ultimate strength relative to the alloy with micron-sized (CoFe)Ti-2 phases. The plastic strain and ultimate strength of the alloy with micron-sized beta-Ti phases is as large as 22.1% and 2826 MPa, respectively. The work-hardening exponent n of the alloy with micron-sized beta-Ti phase, 0.12, is far greater than 0.008 for the alloy with (CoFe)Ti-2 phase. Such significant and different mechanical properties are attributed to the roles and response of micron sized phases during deformation process. (C) 2017 Elsevier Inc All rights reserved.
引用
收藏
页码：260 / 265
页数：6
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