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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摘要第二相强化钨(W)合金具有高强度、良好的抗蠕变和抗辐照等优异性能,是一种极具潜力的聚变堆面向等离子体材料。本文以偏钨酸铵和硝酸镧(La(NO₃)₃)为主要原料,采用溶液燃烧合成法(solution combustion synthesis, SCS)制备不同La₂O₃掺杂量(w(La₂O₃)=0~1.5%)的W-La₂O₃复合粉末,并通过放电等离子烧结制备La₂O₃第二相强化W合金,研究La₂O₃含量对W合金微观组织与力学性能的影响。结果表明：通过SCS可制备出平均粒径约200 nm、分散性好、La₂O₃均匀分布的W-La₂O₃复合粉末。适量La₂O₃的加入可有效改善W合金的物理和力学性能。随La₂O₃含量增加,La₂O₃第二相强化W合金的显微硬度和抗拉强度均呈现先升高后降低的趋势,相对密度则逐渐降低。w(La₂O₃)=0.5%时,W5La合金的显微硬度(HV)达到最大值524.10。引入La₂O₃第二相后,W基体的断裂方式由W晶粒断裂为主转变为沿晶断裂和穿晶断裂共同存在的混合型断裂,并且晶粒尺寸有所减小,平均晶粒尺寸为4.1 μm。与纯W相比,W5La合金具有更高的抗拉强度和更低的韧脆转变温度(ductile-brittle transition temperature, DBTT),其室温和500 ℃的抗拉强度分别为279.6 MPa和498.9 MPa,DBTT为200~300 ℃。

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	付凯超
	许荡
	桑长城
	陈睿智
	陈鹏起
	程继贵

关键词 ： La₂O₃掺杂W粉, 面向等离子体材料, 溶液燃烧合成, 放电等离子烧结, 力学性能

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

收稿日期: 2023-12-19 出版日期: 2024-03-26

ZTFLH:

TB331

基金资助:国家重点研发计划资助项目(2022YFE0109700); 国家自然科学基金资助项目(52274361)

通讯作者: 程继贵,教授,博士。电话：13965053459;E-mail: jgcheng@hfut.edu.cn

引用本文:

付凯超, 许荡, 桑长城, 陈睿智, 陈鹏起, 程继贵. La₂O₃第二相强化W合金的制备及物理与力学性能[J]. 粉末冶金材料科学与工程, 2024, 29(1): 53-62.
FU Kaichao, XU Dang, SANG Changcheng, CHEN Ruizhi, CHEN Pengqi, CHENG Jigui. Preparation, physical and mechanical properties of La₂O₃ second-phase reinforced tungsten alloys. Materials Science and Engineering of Powder Metallurgy, 2024, 29(1): 53-62.

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

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