Unraveling the Hot Deformation Mechanisms and Dynamic Recrystallization Behavior of FeCoCrNiMn High-Entropy Alloy

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2026-06-08 DOI:10.1007/s12540-025-02182-5

Luhai Liao, Shengjie Zhou, Fengguang Li, Shang Dai, Muhammad Abubaker Khan

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Abstract

The hot deformation behavior and dynamic recrystallization (DRX) mechanisms of an equiatomic FeCoCrNiMn high-entropy alloy (HEA) were thoroughly investigated via uniaxial hot compression tests conducted at temperatures ranging from 900 ℃ to 1200 °C and strain rates from 0.01 to 10 s⁻¹. The flow stress behavior was accurately described by a constitutive model based on the Zener-Hollomon parameter, yielding an activation energy of 408 kJ/mol. Processing maps derived from the dynamic materials model (DMM) identified safe deformation domains (1000 ℃–1100 °C/0.01–0.1 s⁻¹ and 1200 °C/0.1 s⁻¹) and instability regions characterized by low DRX fractions and strain localization. Microstructural analyses via EBSD and TEM revealed that discontinuous dynamic recrystallization (DDRX) dominated under most conditions, facilitated by twinning and necklace structure formation, while continuous dynamic recrystallization prevailed at high temperatures and low strain rates. A high density of annealing twin boundaries was observed, particularly under high-strain-rate conditions, which played a critical role in promoting DDRX nucleation. This work provides valuable insights into the DRX mechanisms and hot workability of FeCoCrNiMn HEA, serving as a guide for optimizing thermo-mechanical processing parameters to achieve superior mechanical properties and microstructural control.

Graphical Abstract

查看原文本刊更多论文

feccrnimn高熵合金热变形机理及动态再结晶行为的研究

通过在900℃~ 1200℃、应变速率0.01 ~ 10 s−1范围内的单轴热压缩试验，研究了等原子feccrnimn高熵合金（HEA）的热变形行为和动态再结晶（DRX）机制。基于Zener-Hollomon参数的本构模型准确地描述了材料的流变应力行为，得到活化能为408 kJ/mol。基于动态材料模型（DMM）的加工图确定了安全变形区域（1000℃-1100℃/ 0.01-0.1 s−1和1200℃/0.1 s−1）和不稳定区域，其特征是低DRX分数和应变局部化。通过EBSD和TEM的显微组织分析发现，在大多数条件下，孪晶和项链结构的形成促进了不连续动态再结晶（DDRX），而在高温和低应变速率下，连续动态再结晶占优势。观察到高密度的退火孪晶界，特别是在高应变速率条件下，这对促进DDRX成核起着关键作用。这项工作为feccrnimn HEA的DRX机理和热加工性提供了有价值的见解，为优化热机械加工参数以实现卓越的力学性能和微观组织控制提供了指导。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.