新型沉淀强化共晶高熵合金的模拟指导设计

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-09-26 DOI:10.1016/j.intermet.2024.108501

Manish Kumar Singh , B. Nithin , Kesavan Ravi , M.R. Rahul

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引用次数: 0

摘要

具有硬质相和韧性相的共晶高熵合金（EHEAs）在高温应用中大有可为。通过在韧性相中加入析出物，可以改善 EHEA 的机械性能。本研究的重点是采用 CALPHAD 引导的合金设计方法，开发韧性相中含有立方体 L12 沉淀的 EHEA。对新设计的合金（Al0.17CoCrFeNiTa0.22）进行了模拟指导的热处理循环。Al0.17CoCrFeNiTa0.22 合金显示出 FCC 相，在热处理 12 小时后出现针状富含 Ta 的沉淀，在热处理 24 小时后出现富含 Ni-Al 的立方体沉淀。计算得出的立方体沉淀的混合熵高于针状沉淀。详细的 TEM 表征证实了析出物的特征以及与显微硬度测量结果相关的显微结构变化。该研究提出了一种具有纳米级沉淀强化催化裂化相和共晶菌落的新型 EHEA 系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Simulation-guided design of novel precipitation-strengthened eutectic high entropy alloy

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Simulation-guided design of novel precipitation-strengthened eutectic high entropy alloy

Eutectic high entropy alloys (EHEAs) with hard and ductile phases are promising for high-temperature applications. The mechanical properties of EHEAs can be improved by incorporating precipitates in the ductile phase. The study focuses on the CALPHAD-guided alloy design approach for developing EHEA with cuboidal L1₂ precipitates in the ductile phase. The newly designed alloy (Al_0.17CoCrFeNiTa_0.22) is subjected to a simulation-guided heat treatment cycle. The Al_0.17CoCrFeNiTa_0.22 alloy shows FCC phase with a needle-like Ta-rich precipitate at 12 h and Ni-Al-rich cuboidal precipitate at 24 h of heat treatment. The calculated entropy of mixing of cuboidal precipitate is higher than that of needle-like precipitate. The detailed TEM characterisation confirms the characteristics of precipitates and microstructural changes correlated with microhardness measurements. The study proposes a novel EHEA system with a nano-scale precipitation-strengthened FCC phase and eutectic colony.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.