High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

被引：13

作者：

Du, Zhihao ^{[1
]}

Zhang, Kaifeng ^{[1
]}

Jiang, Shaosong ^{[1
]}

Zhu, Ruican ^{[2
]}

Li, Shuguang ^{[2
]}

机构：

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

[2] Capital Spaceflight Machinery Co, Beijing 100084, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2015年 / 24卷 / 10期

关键词：

cavity evolution; constitutive model; fracture morphology; mechanical behavior; TiAl alloy; HOT TENSILE DEFORMATION; TIAL BASED ALLOY; HIGH NB; MICROSTRUCTURE; PHASE; AL; MODEL;

D O I：

10.1007/s11665-015-1676-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 A degrees C and strain rate range of 1 x 10(-3) to 2.5 x 10(-2) s(-1). The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237% were obtained at the temperature of 1050 A degrees C and strain rate of 1 x 10(-3) s(-1). Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.

引用

页码：3746 / 3754

页数：9

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