The effect of carbon addition on the high-temperature properties of β solidification TiAl alloys

被引：54
作者：
Li, Mingao [1 ,2 ,3 ]
Xiao, Shulong [1 ,3 ]
Chen, Yuyong [1 ,2 ,3 ]
Xu, Lijuan [3 ]
Tian, Jing [3 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China
[3] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 775卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloys; High-temperature tensile properties; Ti3AlC; Strengthening and toughening mechanism; Carbon addition; Dislocation; HOT DEFORMATION-BEHAVIOR; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATIONS; HIGH NIOBIUM; HIGH NB; GAMMA; MICROSTRUCTURE; CREEP; TRANSITION; EVOLUTION;
D O I：
10.1016/j.jallcom.2018.09.397
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of carbon addition on the high-temperature tensile properties and microstructure of Ti-43Al-6Nb-1Mo-1Cr alloys has been studied in this paper. 0.5 at.% C could increase both the ultimate tensile strength(UTS) and elongation of the alloys, as 643.85 +/- 13.06 MPa and 7.07 +/- 1.02% at 800 degrees C, 540.02 +/- 4.29 MPa and 23.55 +/- 0.58% at 850 degrees C, 389.82 +/- 10.24 MPa and 40.5 +/- 0.41% at 900 degrees C. With carbon content increasing from 0.5 at.% to 1.0 at.%, the UTS were increased while the elongations were reduced dramatically at high temperatures. 1.0 at.% carbon addition could also stabilize the UTS in the range of 600-800 MPa at 800-900 degrees C. Additionally, three types of strengthening mechanism and two types of toughening mechanism caused by carbon addition are discussed and concluded. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：441 / 448
页数：8
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