Preparation and characterisation of the Al-Cr-Fe-Mn-Mo high-entropy alloy reinforced by in-situ formed carbides

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2022-10-20 DOI:10.1080/09500839.2022.2134938

T. Stasiak, M. Sow, M. Touzin, F. Béclin, C. Cordier

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引用次数: 1

Abstract

ABSTRACT This study aimed to prepare a composite of the high-entropy alloy from the Al-Cr-Fe-Mn-Mo system reinforced by in-situ formed carbides using powder metallurgy techniques. The alloyed powder was prepared by mechanical alloying in ball-mill devices from pure elemental powders with the addition of a process control agent, namely stearic acid. Then, the alloyed powder was consolidated by hot-press sintering. The structure and microstructure of powder and bulk samples were investigated. The mechanical properties of the bulk sample were evaluated. The investigations revealed two bcc phases in the mechanically alloyed powder. The powder annealing at 950°C triggered the phase transformations, which led to the formation of the multielement matrix bcc phase (a = 2.91 Å) reinforced by two carbides molybdenum-rich M6C (a = 11.15 Å) and chromium-rich M23C6 (a = 10.66 Å). A similar composite structure was present in the bulk sample. The investigations suggested that the primary carbon source for carbide formation was the process control agent – stearic acid. The produced bulk composite revealed promising mechanical properties, such as very high hardness up to 1223 ± 99 HV2 and Young’s modulus of 246 ± 10 GPa.

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原位生成碳化物增强Al-Cr-Fe-Mn-Mo高熵合金的制备及性能

摘要本研究旨在利用粉末冶金技术，由原位形成的碳化物增强的Al-Cr-Fe-Mn-Mo体系制备高熵合金复合材料。合金粉末是在球磨机装置中由纯元素粉末通过机械合金化制备的，并添加了过程控制剂，即硬脂酸。然后，通过热压烧结对合金粉末进行固结。研究了粉末和大块试样的结构和微观结构。对大块样品的力学性能进行了评估。研究表明，机械合金粉末中存在两个bcc相。950°C下的粉末退火引发了相变，从而形成了多元基体bcc相（a = 2.91 Å）由两种富含钼的M6C（a = 11.15 Å）和富铬M23C6（a = 10.66 Å）。在大块样品中存在类似的复合材料结构。研究表明，碳化物形成的主要碳源是过程控制剂硬脂酸。所生产的大块复合材料显示出良好的机械性能，例如高达1223的极高硬度 ± 99 HV2和246的杨氏模量 ± 10 GPa。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.