Effect of carbon addition on the microstructure and mechanical properties of Nb-30Ti-18Al alloy

被引：5
|
作者：
Yu, C. X. [1 ]
Zhao, X. J. [1 ]
Xiao, L. R. [1 ,2 ]
Liu, J. F. [1 ]
Guo, L. [1 ]
Cai, Z. Y. [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 666卷
关键词：
Nb-30Ti-18Al; Phase transformations; Orientation relationship; Compressive strength; Fracture toughness; IN-SITU COMPOSITES; TI-C ALLOYS; HIGH-TEMPERATURE STRENGTH; PHASE-DIAGRAM; DIFFUSION MULTIPLES; FRACTURE-TOUGHNESS; SYSTEM; AL; MO; MOLYBDENUM;
D O I：
10.1016/j.msea.2016.04.057
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The Nb-30Ti-18Al alloys doped with the amounts of 0 at%, 1 at% and 5 at% carbon were prepared by arc melting and annealing. The effects of carbon addition on the microstructure and mechanical properties of Nb-ss/Nb3Al in situ composites as well as the strengthening mechanisms were investigated. The results showed that during annealing at 1200 degrees C, supersaturated Nb-ss decomposed and Nb3Al phase precipitated in C-free alloy, while carbide decomposed with the precipitation of Nb3Al in C-doped alloys. Furthermore, the orientation relationship of Nb3Al phase and the surrounding (Nb, Ti)C was observed in Nb-30Ti-18Al-5C (NA5) alloy. Additionally, with increasing the carbon content, the compressive strength of alloys at high temperature were improved significantly ascribed to the occurrence of solid solution and volume fraction increase of strengthen phase, while the fracture toughness decreased due to the volume fraction decrease of Nbss. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：199 / 206
页数：8
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