Enhanced mechanical properties of molybdenum alloy originating from composite strengthening of Re and CeO2

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-10-01 DOI:10.1016/S1003-6326(24)66609-4

Meng-yao ZHANG , Shuai MA , Xin LI , Ye GAO , Zhuang-zhi WU , De-zhi WANG

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Abstract

To enhance the mechanical properties of molybdenum alloys at both room and high temperatures, Mo−14Re−1CeO₂ alloy was synthesized using the powder metallurgy method, and the corresponding microstructure and mechanical properties were characterized. The results indicate that the ultimate tensile strength of Mo−14Re−1CeO₂ reaches 657 MPa, with a total elongation of 35.2%, significantly higher than those of pure molybdenum (453 MPa, and 7.01%). Furthermore, the compression strength of Mo−14Re−1CeO₂ at high temperature (1200 °C) achieves 355 MPa, which is still larger than that of pure molybdenum (221 MPa). It is revealed that there is a coherent interface between CeO₂ and the Mo−14Re matrix with CeO₂ particles uniformly distributed in both intergranular and intragranular regions. The improvements in mechanical properties are primarily attributed to the formation of Mo−Re solid solution, grain refinement, and dispersion strengthening effect of CeO₂.

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通过 Re 和 CeO2 的复合强化提高钼合金的机械性能

为了提高钼合金在室温和高温下的力学性能，采用粉末冶金法合成了 Mo-14Re-1CeO2 合金，并对相应的微观结构和力学性能进行了表征。结果表明，Mo-14Re-1CeO2 的极限拉伸强度达到 657 兆帕，总伸长率为 35.2%，明显高于纯钼（453 兆帕和 7.01%）。此外，Mo-14Re-1CeO2 在高温（1200 °C）下的压缩强度达到 355 兆帕，仍然大于纯钼（221 兆帕）。研究表明，CeO2 和 Mo-14Re 基体之间存在一个连贯的界面，CeO2 颗粒均匀地分布在晶间和晶内区域。机械性能的改善主要归因于 Mo-Re 固溶体的形成、晶粒细化以及 CeO2 的分散强化效应。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.