Tsakiropoulos Panos
Department of Materials Science and Engineering, Sir Robert Hadfield Building, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.
Materials (Basel). 2022 Apr 12;15(8):2832. doi: 10.3390/ma15082832.
This paper considers metallic ultrahigh-temperature materials (UHTMs) and the alloying behaviour and properties of alloys and their phases by using maps of the parameters δ (based on atomic size), Δχ (based on electronegativity), and valence electron concentration (VEC), and discusses what connects and what differentiates material groups in the maps. The formation of high-entropy or complex concentrated intermetallics, namely 5-3 silicides, C14 Laves and A15 compounds, and bcc solid solutions and eutectics in metallic UHTMs and their co-existence with "conventional" phases is discussed. The practicality of maps for the design/selection of substrate alloys is deliberated upon. The need for environmental coatings for metallic UHTMs was considered and the design of bond coat alloys is discussed by using relevant maps.
本文通过使用基于原子尺寸的参数δ图、基于电负性的Δχ图以及价电子浓度（VEC）图，研究了金属超高温材料（UHTMs）以及合金及其相的合金化行为和性能，并讨论了这些图中材料组之间的联系和差异。文中讨论了金属超高温材料中高熵或复杂集中金属间化合物的形成，即5-3硅化物、C14型拉夫斯相和A15型化合物，以及体心立方固溶体和共晶，以及它们与“传统”相的共存情况。文中还探讨了这些图在基体合金设计/选择方面的实用性。考虑了金属超高温材料环境涂层的必要性，并通过使用相关图讨论了粘结层合金的设计。
