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采用机械合金化和微波烧结制备了La2O3掺杂的WC-10AlCoCrFeNi硬质合金，研究了La2O3含量对WC-10AlCoCrFeNi硬质合金相结构、微观组织和力学性能影响。结果表明：机械合金化制备的高熵合金粉末化学成分均匀，无明显富集现象；La2O3可以降低Al元素氧化程度，细化晶粒，促进裂纹的偏转和桥接；随着La2O3含量的增加，硬质合金的晶粒尺寸先增大后减小，力学性能先升高后降低。当La2O3含量为0.075 mass%时，硬质合金的组织均匀，性能最好，晶粒尺寸达0.44μm,相对密度为95.81%、硬度为1616.57 HV30、断裂韧性为13.64 MPa·m1/2、弯曲强度为1404.05 MPa。
Abstract：WC-10AlCoCrFeNi cemented carbides doped with La2O3 were prepared by mechanical alloying and microwave sintering. The effect of La2O3 content on phase structure, microstructure and mechanical properties of the WC-10AlCoCrFeNi cemented carbides was studied. The results show that the high entropy alloy powder prepared by mechanical alloying has uniform chemical composition and no obvious enrichment phenomenon. La2O3 can reduce the oxidation degree of Al element, refine grain size, and promote crack deflection and bridging. With the increase of La2O3 content, the grain size of the cemented carbides first increases and then decreases, and the mechanical properties first increase and then decrease. When the content of La2O3 is 0.075 mass%, the microstructure of the cemented carbides is uniform and the performance is the best, the grain size is 0.44 μm, the relative density is 95.81%, the hardness is 1616.57 HV30, the fracture toughness is 13.64 MPa·m1/2, and the bending strength is 1404.05 MPa.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2023-0428
中图分类号:TG135.5
引用信息:
[1]付洛辉,唐思文,卢继等.La_2O_3掺杂对微波烧结WC-10AlCoCrFeNi硬质合金微观结构及性能的影响[J],2024,45(06):73-83.DOI:10.13289/j.issn.1009-6264.2023-0428.
基金信息:
国家自然科学基金面上项目(52275424);; 湖南省自然科学基金面上项目(2023JJ30257);; 湖南省教育厅重点项目(22A0346)