Microstructure and mechanical properties of a high nitrogen titanium alloy

被引:42
作者
Ando, Tomohiro [1 ]
Nakashima, Koichi [1 ]
Tsuchiyama, Toshihiro [1 ]
Takaki, Setsuo [1 ]
机构
[1] Kyushu Univ, Dept Mat Sci & Engn, Nishi Ku, Fukuoka 8190395, Japan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 486卷 / 1-2期
关键词
solution nitriding; alpha' martensite; aging; (alpha plus beta) dual phase structure; solid solution strengthening;
D O I
10.1016/j.msea.2007.08.074
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
High nitrogen titanium alloy with the chemical composition of Ti-4%Cr-0.6%N was produced by solution nitriding to nitrogen-free Ti-4%Cr alloy, and then its microstructure was controlled to have fine (alpha + beta) dual phase structure by aging treatment to improve the ductility. As solution-nitrided specimen has a platelet hcp-martensitic structure (alpha') and is characterized by hard but brittle nature that has been produced by solid solution of 0.6% of nitrogen. On the following aging treatment, fine beta phase formed along the original plate boundaries, resulting in a fine (alpha + beta) dual phase microstructure. X-ray and EELS analyses revealed that nitrogen is greatly concentrated in the tempered alpha' phase. Although the hardness of as-quenched material gradually decreases during the aging treatment with increasing volume fraction of P, the hardness can be kept much higher than that of the aged Ti-4%Cr alloy without nitrogen. As a result of tensile testing, it was found that the aged Ti-4%Cr-0.6%N alloy has high tensile strength over 1 GPa with moderate ductility. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:228 / 234
页数:7
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