Enhanced an eutectic carbide reinforced niobium alloy by optimizing Mo and W alloying elements

IF 4.2 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Refractory Metals & Hard Materials Pub Date : 2024-09-18 DOI:10.1016/j.ijrmhm.2024.106893
Qiang Shen , Xinting Wu , Xiaohong Chen , Qinqin Wei , Jian Zhang , Guoqiang Luo
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Abstract

Niobium alloys play an indispensable role in aerospace technology. However, traditional niobium alloys has unsatisfactory or high-temperature strength or limited room-temperature. This work introduces Nb2MoxWyC0.25 alloys with strength-plasticity balance by optimizing refractory alloy elements and eutectic carbides drawing on the design concepts of eutectic high-entropy alloys. The influence of Mo and W contents on the microstructure and mechanical properties of the alloys was studied. The Nb2MoxWyC0.25 alloy contain body-centered cubic (BCC) primary phase and eutectic structures composed of BCC and carbide phases with semi-coherent interfaces. Appropriate additions of Mo and W refine the grain size of the primary BCC phase and cause the carbide phase to evolve from Nb2C to NbC. The Nb2Mo0.5W0.5C0.25 hypoeutectic niobium alloy composed of BCC and Nb2C phases with a relatively small lattice mismatch has a room-temperature yield strength of 1.27 ± 0.04 GPa, compressive strength of 2.03 ± 0.06 GPa, and a fracture strain of 17.8 ± 2.2 %. Solid solution strengthening in the BCC phase and second-phase strengthening of the carbide phase simultaneously enhance the alloy. The fine grain strengthening, reduced crack origination at low mismatch interface, and the crack tip by soft BCC at the phase interface improve the plasticity simultaneously. This paper provides a method to improve the room-temperature plasticity and strength of refractory niobium alloys, laying the foundation for the industrial application of refractory niobium alloys.
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通过优化钼和钨合金元素强化共晶碳化物强化铌合金
铌合金在航空航天技术中发挥着不可或缺的作用。然而,传统铌合金的高温强度或室温强度都不尽如人意。本研究借鉴共晶高熵合金的设计理念,通过优化难熔合金元素和共晶碳化物,推出了强度-塑性平衡的 Nb2MoxWyC0.25 合金。研究了 Mo 和 W 含量对合金微观结构和机械性能的影响。Nb2MoxWyC0.25 合金含有体心立方(BCC)主相以及由 BCC 相和碳化物相组成的共晶结构,具有半相干界面。适当添加 Mo 和 W 可细化 BCC 主相的晶粒尺寸,并使碳化物相从 Nb2C 演化为 NbC。由 BCC 相和 Nb2C 相组成的 Nb2Mo0.5W0.5C0.25 低共晶铌合金具有相对较小的晶格失配,其室温屈服强度为 1.27 ± 0.04 GPa,抗压强度为 2.03 ± 0.06 GPa,断裂应变为 17.8 ± 2.2 %。BCC 相的固溶强化和碳化物相的第二相强化同时增强了合金。细晶粒强化、低失配界面裂纹起源减少以及相界面软 BCC 产生的裂纹尖端同时改善了合金的塑性。本文提供了一种提高难熔铌合金室温塑性和强度的方法,为难熔铌合金的工业应用奠定了基础。
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来源期刊
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.
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