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High-entropy alloys and metallic nanocomposites: Processing challenges, microstructure development and property enhancement

机译：高熵合金和金属纳米复合材料：加工挑战，微结构发展和性能增强

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摘要

Two classes of new materials, i.e. high entropy alloys (HEAs) and metallic nanocomposites offer processing related challenges, while showing significant promise for an array of technological applications requiring wear and irradiation resistance. This review addresses those challenges together with microstructure-property correlations. In particular, the main focus of this review is to demonstrate the efficacy of the superfast densification route, i.e., spark plasma sintering (SPS) as an effective consolidation route for these two classes of materials.To start with, this review will critically analyze the influence of conventional solidification on the microstructure and property of Cu-based bearing alloys. Using nanocrystalline Cu-Pb and Cu-Pb-TiB2, Cu-Pb-cBN (cubic boron nitride) as model systems, various aspect of the microstructure-property correlation and enhancement of the tribological properties will be highlighted. A thorough understanding of the processing related issues and stability of the nanoscale/ultrafine microstructure obtainedviaSPS will be illustrated.A significant part of this review will further discuss the development of novel nanostructured HEAs and HEA-based composites for wear and irradiation resistance applications. The efficacy of SPS route to prepare bulk HEAs with high sinter density will be demonstrated, together with property enhancement in single phase and two-phase HEAs. HEA-based nanocomposites containing soft metallic dispersoids (Bi, Pb, Ag) and ceramic lubricating phases (MoS2, CaF2/BaF2) for wear resistance application will be highlighted. Finally, oxide dispersed and refractory HEAsviaMASPS route for irradiation resistance application will be discussed to elucidate the effective usage of the design and development of HEAs for technologically critical applications.
机译：两类新材料，即高熵合金（HEA）和金属纳米复合材料提出了与加工相关的挑战，同时也为要求耐磨性和耐辐射性的一系列技术应用显示了巨大希望。这篇综述解决了这些挑战以及微观结构-特性的相关性。尤其是，本综述的主要重点是证明超快致密化途径（即火花等离子体烧结（SPS））作为这两种材料的有效固结途径的功效。常规凝固对铜基轴承合金组织和性能的影响。以纳米晶态的Cu-Pb和Cu-Pb-TiB2，Cu-Pb-cBN（立方氮化硼）为模型系统，将突出微观结构-特性相关性和摩擦学特性增强的各个方面。将阐明对与加工相关的问题以及通过SPS获得的纳米级/超细微结构的稳定性的透彻理解。本综述的重要部分将进一步讨论新型纳米结构HEA和HEA基复合材料的开发，以用于耐磨性和耐辐照性应用。将证明SPS路线制备具有高烧结密度的块状HEA的功效，以及单相和两相HEA的性能增强。将重点介绍HEA基纳米复合材料，其中包含软金属弥散体（Bi，Pb，Ag）和陶瓷润滑相（MoS2，CaF2 / BaF2），用于耐磨性应用。最后，将讨论氧化物弥散性和难熔性HEAsviaMASPS路线在抗辐射应用中的应用，以阐明在技术关键性应用中HEA设计和开发的有效利用。

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