La<sub>2</sub>O<sub>3</sub>第二相强化W合金的制备及物理与力学性能

doi:10.19976/j.cnki.43-1448/TF.2023082

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Abstract Second-phase reinforced tungsten (W) alloy has excellent properties such as high strength, great creep resistance, and irradiation resistance, it is a highly promising plasma facing material for fusion reactor. In this paper, W-La₂O₃ composite powders with different La₂O₃ contents (w(La₂O₃)=0-1.5%) were prepared by solution combustion synthesis (SCS) using ammonium metatungstate and lanthanum nitrate (La(NO₃)₃) as the main raw materials. Then the La₂O₃ second-phase reinforced W alloys were further prepared by spark plasma sintering, and the effects of La₂O₃ content on the microstructures and mechanical properties of the W alloys were investigated. The results show that W-La₂O₃ composite powders with average particle size of approximately 200 nm, well dispersion, and uniform distribution of La₂O₃ can be successfully synthesized using SCS. The addition of appropriate amount of La₂O₃ can effectively improve the physical and mechanical properties of W alloys. With the increase of La₂O₃ contents, the microhardness and tensile strength of the La₂O₃ second-phase reinforced W alloys show a tendency that increases first and then decreases, while the relative density gradually decreases. The microhardness (HV) of W5La alloy reaches the maximum value of 524.10 at w(La₂O₃)=0.5%. After the addition of the second-phase of La₂O₃, the fracture mode of the W matrix is changed from W grain fracture predominantly to a mixed fracture with the co-existence of intergranular fracture and transgranular fracture, and the grain size is reduced with an average grain size of 4.1 μm. Compared with pure W, W5La alloy has higher tensile strength and lower ductile-brittle transition temperature (DBTT), and its tensile strength at room temperature and 500 ℃ is 279.6 MPa and 498.9 MPa, respectively, and DBTT is 200-300 ℃.

Key words： La₂O₃ doped W powder plasma facing material solution combustion synthesis spark plasma sintering mechanical property

Received: 19 December 2023 Published: 26 March 2024

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	FU Kaichao
	XU Dang
	SANG Changcheng
	CHEN Ruizhi
	CHEN Pengqi
	CHENG Jigui

Cite this article:

FU Kaichao,XU Dang,SANG Changcheng, et al. Preparation, physical and mechanical properties of La₂O₃ second-phase reinforced tungsten alloys[J]. Materials Science and Engineering of Powder Metallurgy, 2024, 29(1): 53-62.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023082 OR http://pmbjb.csu.edu.cn/EN/Y2024/V29/I1/53

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