Abstract

A relatively new approach to obtaining metal materials containing several principal elements in equiatomic concentrations which look promising for replacing commercially used alloys is proposed. Such materials are called high-entropy alloys (HEAs). Studies show that HEAs tend to form a simple solid-solution structure and can also contain ordered intermetallic phases. Such a method of forming metal materials can be regarded as a background for producing new HEAs with elevated performance characteristics. Most studies focus on the relationship between microstructure and measured properties; significantly less attention is paid to studying and developing new effective methods for creating HEAs. In this paper, we study the possibility of obtaining CoCrFeNiMn–(X) HEAs by centrifugal metallothermic SHS. Chemical and technological modes of modifying cast CoCrFeNiMn alloy during synthesis (in situ) by introducing alloying components into the starting exothermic compositions are tested for the first time. The microstructure and phase composition of NiCrCoFeMn alloys synthesized from mixtures containing Ti–Si–B(C) or Al are characterized. The microstructure of CoCrFeNiMn–(Ti–Si–B(C)) HEAs is found to consist of an HEA-based matrix and new structural inclusions of carbides and borides of titanium. High-Al CoCrFeNiMn–Al HEAs are represented by a composite structure containing NiAl as a basis and dispersion nanoprecipitates (~100 nm) of a Cr- and Fe-based solid solution.

中文翻译：

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铸造Co-Cr-Fe-Ni-Mn-（Х）合金的离心金属热SHS

摘要

提出了一种相对新的方法来获得包含等原子浓度的几种主要元素的金属材料，这些材料看起来有望替代商业使用的合金。这种材料称为高熵合金（HEA）。研究表明，HEA倾向于形成简单的固溶体结构，还可能包含有序的金属间相。这种形成金属材料的方法可以被认为是生产具有提高的性能特征的新的HEA的背景。大多数研究集中在微观结构和测量性能之间的关系。研究和开发用于创建HEA的新有效方法的注意力大大减少。在本文中，我们研究了通过离心金属热SHS获得CoCrFeNiMn–（X）HEA的可能性。首次测试了在合成过程中（原位）通过将合金成分引入起始放热组合物中对铸造CoCrFeNiMn合金进行改性的化学和工艺模式。表征了由含Ti-Si-B（C）或Al的混合物合成的NiCrCoFeMn合金的显微组织和相组成。发现CoCrFeNiMn–（Ti–Si–B（C））HEA的微观结构包括基于HEA的基体和钛的碳化物和硼化物的新结构夹杂物。高铝CoCrFeNiMn-Al HEA的复合结构以NiAl为基础，并形成了基于Cr和Fe的固溶体的分散纳米沉淀（约100 nm）。表征了由含Ti-Si-B（C）或Al的混合物合成的NiCrCoFeMn合金的显微组织和相组成。发现CoCrFeNiMn–（Ti–Si–B（C））HEA的微观结构包括基于HEA的基体和钛的碳化物和硼化物的新结构夹杂物。高铝CoCrFeNiMn-Al HEA的复合结构以NiAl为基础，并形成了基于Cr和Fe的固溶体的分散纳米沉淀（约100 nm）。表征了由含Ti-Si-B（C）或Al的混合物合成的NiCrCoFeMn合金的显微组织和相组成。发现CoCrFeNiMn–（Ti–Si–B（C））HEA的微观结构包括基于HEA的基体和钛的碳化物和硼化物的新结构夹杂物。高铝CoCrFeNiMn-Al HEA的复合结构以NiAl为基础，并形成了基于Cr和Fe的固溶体的分散纳米沉淀（约100 nm）。