Fracture behavior of the La-doped molybdenum-titanium-zirconium alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:759

Article

Hu, Bo-liang^1,2  Wang, Kuai-She^1,2  Hu, Ping^1,2  Li, Shi-Lei^1,2  Deng, Jie^1,2  Zuo, Ye-gai^1,2  Xing, Hai-rui^1,2  Feng, Peng-Fa³  Paley, Vladislav⁴  Volinsky, Alex A.⁴ 

[1] Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Shaanxi, Peoples R China

[2] Xian Univ Architecture & Technol, Natl & Local Joint Engn Res Funct Ctr Mat Proc, Xian 710055, Shaanxi, Peoples R China

[3] Jinduicheng Molybdenum Co Ltd, Xian 710077, Shaanxi, Peoples R China

[4] Univ S Florida, Dept Mech Engn, Tampa, FL 33620 USA

关键词: La-doped titanium-zirconium-molybdenum alloy;    Fracture behavior;    Brittle phase;    Formation mechanism;    Powder methods;    Phase transformation;   

DOI  :  10.1016/j.msea.2019.05.031

来源: Elsevier

【 摘 要 】

The 1.0 wt% La - doped molybdenum - 0.6 wt% titanium - 0.11 wt% zirconium (La-TZM) alloy has a maximum tensile strength of 1350 MPa and elongation to failure of 7.5%, at room temperature. In this paper, the fracture behavior of this La-TZM alloy was studied. The La2Ti2O7 phase produces micro-cracks during rolling deformation which eventually propagate to full cracks during tensile testing. The reason for the La-TZM fracture is deformation incompatibility and large stress concentrations at the La2Ti2O7 particles inducing particle cracking, leading to micro-cracks along the grain boundaries. The La2Ti2O7 phase is composed of 69.8 at.% O - 13.3 at.% Ti - 0.6 at.% Zr - 10.4 at% La and is formed by the La2O3, TiO2, and ZrO2 secondary phases when sintered above 1350 degrees C.

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