Mechanical properties, deformation behavior and microstructure evolution of Ti-43Al-6Nb-1Mo-1Cr alloys

被引：24

作者：

Li, Mingao ^{[1
,2
,3
]}

Xiao, Shulong ^{[2
,3
]}

Xu, Lijuan ^{[3
]}

Chen, Yuyong ^{[1
,2
,3
]}

Tian, Jing ^{[3
]}

Zhang, Baoyou ^{[4
]}

机构：

[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China

[3] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[4] Harbin Inst Technol, Ctr Anal & Measurement, Harbin 150001, Heilongjiang, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2018年 / 136卷

基金：

中国国家自然科学基金;

关键词：

TiA1; alloys; Isothermal compression tests; Deformation; Microstructure evolution; Hot processing maps; Phase transformation; GAMMA-TIAL ALLOY; DYNAMIC RECRYSTALLIZATION; HIGH-TEMPERATURE; HOT DEFORMATION; HIGH NB; OXIDATION BEHAVIOR; FRACTURE-TOUGHNESS; ALUMINIDE ALLOYS; PROCESSING MAPS; FLOW BEHAVIOR;

D O I：

10.1016/j.matchar.2017.11.050

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high-temperature properties, microstructure evolution and deformation behavior of a novel Ti-43Al-6Nb-1Mo-1Cr(at.%) alloy were studied in this paper. The ultimate tensile strength (UTS) and elongation (5) were tested at 800, 850, and 900 degrees C, in which the excellent strength 551 MPa, 510 MPa, and 382 MPa, and elongation 2.9%, 12.7%, and 16.8% were exhibited, respectively. Isothermal compression tests were carried out in the temperature range of 1100-1250 degrees C and strain rate range of 0.001-1.0 s(-1). Based on dynamic materials model (DMM) and phase diagram, dynamic recrystallization mechanism and phase transformation during thermal deformation were clarified and the hot processing maps were calculated. The experimental results show that the values of stress exponent (n) and the apparent deformation activation energy (Q) of Ti-43Al-6Nb-1Mo-1cr(at.%) were calculated to be 2.77 and 571 KJ/mol. Meanwhile, three various types of microstructure evolution in different deformation conditions were discussed and concluded.

引用

页码：69 / 83

页数：15

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