High strength refractory high-entropy alloy matrix composites reinforced with in-situ formed Al2O3 particles

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-08-09 DOI:10.1016/j.ijrmhm.2025.107368

Diqiang Liu , Weiqi Zhao , Guangkun Chen , Aihong Cui , Yang Xiao , Jiangang Jia , Junhu Meng

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引用次数: 0

Abstract

Refractory high entropy alloys are desirable for applications in extreme environment, owing to their high hardness and strength together with excellent resistance to thermal shock at high temperature. Despite the high hardness of refractory high entropy alloys, the low fracture toughness can not currently satisfy the associated mechanical properties requirements. Based on compositional adjustability of RHEA, we design and fabricate refractory high entropy alloy of NbTaMoW with enhanced toughness via thermite reaction. Introduction thermite reaction into RHEA promotes the formation of single phase NbTaMoW, due to thermite reaction released a lot of energy. Toughness is realized through developing NbTaMoW composites with uniformly distributed in-situ formed Al₂O₃ phase. Apart from higher mechanical strength, Al₂O₃/NbTaMoW composites exhibits significantly enhanced fracture toughness of 6.3 MPa·m^1/2, exceeding that of measured value of NbTaMoW. Toughness effect is mainly attributed to the in-situ formed Al₂O₃ during sintering process, which promotes crack deflection and crack branching. This work thus demonstrates a strategy way to fabricate toughening RHEA matrix composites by taking advantage of their constituent flexibility.

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原位形成Al2O3颗粒增强高强难熔高熵合金基复合材料

难熔高熵合金具有高硬度、高强度和优异的高温抗热震性能，是极端环境下的理想材料。尽管难熔高熵合金具有较高的硬度，但其较低的断裂韧性目前还不能满足相关的力学性能要求。基于RHEA的成分可调性，通过铝热反应，设计并制备了具有增强韧性的NbTaMoW高熵耐火合金。在RHEA中引入铝热剂反应促进了单相NbTaMoW的形成，由于铝热剂反应释放了大量的能量。通过制备具有均匀分布原位形成Al2O3相的NbTaMoW复合材料来实现韧性。Al2O3/NbTaMoW复合材料的断裂韧性显著提高，达到6.3 MPa·m1/2，超过NbTaMoW的实测值。韧性效应主要归因于烧结过程中原位形成的Al2O3，它促进了裂纹的偏转和分支。因此，这项工作展示了一种通过利用其成分的灵活性来制造增韧的RHEA基复合材料的策略方法。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.