The effect of boron addition on the high-temperature properties and microstructure evolution of high Nb containing TiAl alloys

被引：46
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：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 733卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloys; High-temperature properties; Microstructure evolution; Boron addition; Dislocations; Strengthening mechanism; HOT DEFORMATION-BEHAVIOR; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; SOLIDIFICATION; PHASE; STABILITY; FRACTURE;
D O I：
10.1016/j.msea.2018.07.019
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of boron addition on the microstructure evolution and high-temperature properties of Ti-43Al-6Nb-1Mo-1Cr alloys has been studied in this paper. With the boron content increasing from 0 at% to 1.0 at%, the ultimate tensile strength(UTS) at high temperature increase dramatically while the alloys with 1.0at%B exhibit UTS as 656.12 +/- 20.54 MPa at 800 degrees C, 642.43 +/- 14.44 MPa at 850 degrees C and 508.44 +/- 16.12 MPa at 900 degrees C, respectively. Meanwhile, boron addition could stabilize the high-temperature UTS of the alloys in 500-700 MPa with the temperature incresasing. Three types of strengthening mechanism in high-temperature strength caused by boron addition are also discussed and concluded.
引用
收藏
页码：190 / 198
页数：9
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