2O3的WMoNbTaV難熔高熵合金，研究了燒結溫度對合金致密化行為、相結構、顯微組織和耐磨性能的影響。結果表明：在1800~1900 ℃燒結時，WMoNbTaV-Al2O3高熵合金基體具有單一bcc相結構，Al2O3的平均晶粒尺寸為1.15 μm。隨著燒結溫度升高，合金的晶粒尺寸增大，致密度和顯微硬度也在不斷增高，在1900 ℃燒結時硬度達到7967.4 MPa。1900 ℃燒結得到的合金具有優(yōu)異的耐磨性，磨損量僅為1800 ℃燒結合金的一半。且WMoNbTaV-Al2O3高熵合金的耐磨性遠高于純W材料。當磨料粒度為37.5 μm時，1900 ℃燒結的合金磨損量為0.9 mg，磨損性能是純W材料的83倍。"/>

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放電等離子燒結WMoNbTaV-Al2O3 高熵合金組織及磨損性能
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1.河南科技大學 材料科學與工程學院，河南 洛陽 471000;2.河南科技大學 河南省高溫難熔金屬材料國際聯(lián)合實驗室，河南 洛陽 471000;3.中國工程物理研究院 核物理與化學研究所，四川 綿陽 621900

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基金項目:

NSFC(U2004180); National Key R&D Program of China（2020YFB2008400）


Microstructure and Wear Properties of WMoNbTaV-Al2O3 High Entropy Alloy Prepared by Spark Plasma Sintering
Author:
Affiliation:

1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471000, China;2.Henan International Joint Laboratory for High Temperature Refractory Metal Materials, Henan University of Science and Technology, Luoyang 471000, China;3.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

Fund Project:

National Natural Science Foundation of China (U2004180); National Key R&D Program of China (2020YFB2008400)

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    摘要:

    以金屬粉末為原料，采用放電等離子燒結技術制備新型含α-Al2O3的WMoNbTaV難熔高熵合金，研究了燒結溫度對合金致密化行為、相結構、顯微組織和耐磨性能的影響。結果表明：在1800~1900 ℃燒結時，WMoNbTaV-Al2O3高熵合金基體具有單一bcc相結構，Al2O3的平均晶粒尺寸為1.15 μm。隨著燒結溫度升高，合金的晶粒尺寸增大，致密度和顯微硬度也在不斷增高，在1900 ℃燒結時硬度達到7967.4 MPa。1900 ℃燒結得到的合金具有優(yōu)異的耐磨性，磨損量僅為1800 ℃燒結合金的一半。且WMoNbTaV-Al2O3高熵合金的耐磨性遠高于純W材料。當磨料粒度為37.5 μm時，1900 ℃燒結的合金磨損量為0.9 mg，磨損性能是純W材料的83倍。

    Abstract:

    A new refractory high entropy alloy WMoNbTaV containing Al2O3 was prepared by spark plasma sintering. The effects of sintering temperature on densification behavior, phase structure, microstructure and wear resistance of the alloy were studied. The results show that when sintered at 1800?1900 °C, the matrix of WMoNbTaV-Al2O3 has a single bcc phase structure, and the average grain size of Al2O3 is 1.15 μm. With the increase in sintering temperature, the grain size of the alloy increases, the density and microhardness also increase, and the hardness reaches 7967.4 MPa when the sintering temperature is 1900 °C. The alloy sintered at 1900 °C has excellent wear resistance, and the wear amount is only half of that of the alloy sintered at 1800 °C. The wear resistance of WMoNbTaV-Al2O3 high entropy alloy is much higher than that of pure W material. When the abrasive particle size is 37.5 μm, the wear mass loss of alloy sintered at 1900 °C is 0.9 mg, and the wear resistance of alloy is 83 times higher than that of pure W material.

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劉美君,徐流杰,李洲,郭明宜,胡繼康,申華海.放電等離子燒結WMoNbTaV-Al2O3 高熵合金組織及磨損性能[J].稀有金屬材料與工程,2024,53(5):1236~1244.[Liu Meijun, Xu Liujie, Li Zhou, Guo Mingyi, Hu Jikang, Shen Huahai. Microstructure and Wear Properties of WMoNbTaV-Al2O3 High Entropy Alloy Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2024,53(5):1236~1244.]
DOI：10.12442/j. issn.1002-185X. E20230049

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  • 收稿日期:2023-11-14
  • 最后修改日期:2024-03-18
  • 錄用日期:2024-01-05
  • 在線發(fā)布日期: 2024-05-27
  • 出版日期: 2024-05-22