Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 52, Issue -, Pages 131-136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2015.05.006
Keywords
La doping; TZM alloy; La doping; Mechanical properties; DBIT
Funding
- Major Scientific and Technological Innovation Project of the Shaanxi Province [S2011ZK1087]
- Science and Technology Innovation Fund Project of the Western Metal Materials Co., Ltd [XBCL-1-06]
- Science and Technology Coordinating Innovative Engineering Project of the Shaanxi Province [2014KTCQ01-35]
- workstation of postdoctoral scientific reserch in jinduicheng Molybdenum Co., Ltd.
- Innovation Team Foundation of Xi'an University of Architecture and Technology
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Powder metallurgy methods were utilized to prepare lanthanum-doped titanium-zirconium-molybdenum (La-TZM) and traditional TZM alloy plates. Tensile and Charpy impact tests were employed to study the room temperature and cryogenic mechanical properties of the two kinds of TZM alloys. For the same process conditions, the lanthanum doping has significantly improved the tensile strength and elongation, which increased by 28.2% and 32.8%, respectively. For these process conditions, the La-TZM has higher density and smaller evenly distributed secondary phases. Compared with TZM, the secondary phase in La-TZM is finer, and hinders the spreading of cracks. This is why the La-TZM alloy plates have higher strength and elongation. By doping lanthanum, the ductile-to-brittle transition temperature of the TZM alloy decreased from -80 degrees C to -120 degrees C. The secondary phase La particles refine the grain and hinder fracture expansion across the grains during the impact fracture of the La-TZM alloy. TZM alloy improved room temperature and cryogenic mechanical properties significantly expand its application range. (C) 2015 Elsevier Ltd. All rights reserved.
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