无机材料学报 ›› 2021, Vol. 36 ›› Issue (4): 386-392.DOI: 10.15541/jim20200479

所属专题: 【结构材料】超高温结构陶瓷 【结构材料】高熵陶瓷

• 研究论文 • 上一篇    下一篇

陶瓷颗粒增强Cr0.5MoNbWTi难熔高熵合金复合材料的制备及其力学性能

吕莎莎1(), 祖宇飞2, 陈国清1(), 赵伯俊1, 付雪松1, 周文龙1   

  1. 1.大连理工大学 材料科学与工程学院, 辽宁省凝固控制与数字化制备技术重点实验室, 大连 116085
    2.大连理工大学 航空航天学院, 辽宁省空天飞行器前沿技术重点实验室, 大连 116085
  • 收稿日期:2020-08-18 修回日期:2020-10-04 出版日期:2021-04-20 网络出版日期:2020-11-05
  • 通讯作者: 陈国清, 教授. E-mail: gqchen@dlut.edu.cn
  • 作者简介:吕莎莎(1987-), 女, 博士研究生. E-mail: 352445591@qq.com
  • 基金资助:
    国家自然科学基金(51805069);国家自然科学基金(U1908229);航空科学基金(20183663004);中央高校基本科研业务费(DUT20GF115);中央高校基本科研业务费(DUT20JC52)

Preparation and Mechanical Property of the Ceramic-reinforced Cr0.5MoNbWTi Refractory High-entropy Alloy Matrix Composites

LÜ Shasha1(), ZU Yufei2, CHEN Guoqing1(), ZHAO Bojun1, FU Xuesong1, ZHOU Wenlong1   

  1. 1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China
    2. Key Laboratory of Advanced Technology for Aerospace Vehicles (Liaoning Province), School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116085, China
  • Received:2020-08-18 Revised:2020-10-04 Published:2021-04-20 Online:2020-11-05
  • Contact: CHEN Guoqing, professor. E-mail: gqchen@dlut.edu.cn
  • About author:LÜ Shasha(1987-), female, PhD candidate. E-mail: 352445591@qq.com
  • Supported by:
    Natural Science Foundation of China(51805069);Natural Science Foundation of China(U1908229);Aviation Science Funds of China(20183663004);Fundamental Research Funds for the Central Universities(DUT20GF115);Fundamental Research Funds for the Central Universities(DUT20JC52)

摘要:

难熔高熵合金因其优异的力学性能、高温稳定性和抗氧化性能等, 作为高温结构材料具有广阔的应用前景。为了进一步提升材料的力学性能, 本研究利用原位反应烧结制备了陶瓷颗粒增强难熔高熵合金复合材料, 并探讨了陶瓷增强相的生成机理及其对复合材料力学性能的影响。通过机械合金化制备了含有碳氮氧非金属元素的Cr0.5MoNbWTi过饱和体心立方(Body Centered Cubic, BCC)固溶体粉末, 经后续放电等离子烧结, 在BCC基体内部原位反应生成了大量弥散分布的(Nb,Ti)(N,C)和Ti2O3陶瓷增强相。在陶瓷颗粒的增强作用下, 该复合材料表现出较高的室温强度(4033 MPa)和硬度(11.57 GPa)以及优越的高温强度, 1400 ℃的屈服强度高达572 MPa。

关键词: 难熔高熵合金, 陶瓷增强相, 复合材料, 力学性能

Abstract:

As promising high-temperature structural materials, refractory high-entropy alloys have widely applications due to their excellent mechanical properties, high-temperature stability and oxidation resistance. For further improving the mechanical properties, ceramic-reinforced refractory high-entropy alloy matrix composites were prepared by utilizing in-situ reaction sintering. The supersaturated body centered cubic (BCC) solid solution of Cr0.5MoNbWTi doped with nonmetallic elements of carbon, nitrogen and oxygen was prepared by mechanical alloying. During spark plasma sintering, (Nb,Ti)(N,C) and Ti2O3 ceramic reinforcements were formed by in-situ reaction between nonmetallic and metallic elements. The ceramic reinforcements were well dispersed in BCC matrix. The formation mechanism and the strengthening effects of the ceramic reinforcements were discussed in this paper. With the assistance of the fine-grained ceramic reinforcements, the composites exhibited ultra-high ambient-temperature strength (4033 MPa), ambient-temperature hardness (11.57 GPa), and superior high-temperature yield strength (572 MPa at 1400 ℃).

Key words: refractory high-entropy alloy, ceramic reinforcement, composite, mechanical property

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