双形态异质结构<strong>FeCrNiAl</strong>多主元合金的强塑性

doi:10.11901/1005.3093.2025.034

材料研究学报

2025, Vol. 39

Issue (12): 952-960 DOI: 10.11901/1005.3093.2025.034

研究论文

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双形态异质结构FeCrNiAl多主元合金的强塑性

王君阳¹^,², 胡利昊¹^,², 张璐¹^,²(

)

^1.沈阳航空航天大学材料科学与工程学院沈阳 110136
^2.沈阳航空航天大学航空制造工艺数字化国防重点学科实验室沈阳 110136

Strength and Ductility of Dual-phasic Heterostructured FeCrNiAl Multi-principal Element Alloy

WANG Junyang¹^,², HU Lihao¹^,², ZHANG Lu¹^,²(

)

^1.School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
^2.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China

引用本文:

王君阳, 胡利昊, 张璐. 双形态异质结构FeCrNiAl多主元合金的强塑性[J]. 材料研究学报, 2025, 39(12): 952-960.
Junyang WANG, Lihao HU, Lu ZHANG. Strength and Ductility of Dual-phasic Heterostructured FeCrNiAl Multi-principal Element Alloy[J]. Chinese Journal of Materials Research, 2025, 39(12): 952-960.

全文: PDF(12251 KB) HTML

摘要:

用真空电弧熔炼Fe₄₀Cr₃₇Ni₂₀Al₃多主元合金并进行冷轧退火以调控其显微组织，系统研究了这种合金力学性能变化的微观机制。结果表明，这种合金的固溶态具有BCC+FCC双相结构，冷轧退火处理使其具有双形态异质结构，BCC相和FCC相分别转变为“硬包软”型与“混晶”型异质结构，使强度和塑性协同提高。塑性提高的主要原因，是“硬包软”型异质结构使原BCC相的变形能力提高；强度的提高主要与双异质结构引起的HDI强化效应和组织细化相关。

关键词 ：金属材料, 多主元合金, 热机械处理, 力学性能, 异质结构

Abstract：

A multi-component high-entropy alloy Fe₄₀Cr₃₇Ni₂₀Al₃was melted via vacuum arc melting and casting, which then was subjected to cold rolling and annealing so that to control and adjust its microstructure. Then the microstructure evolution and mechanical properties of the alloy were systematically investigated. The results demonstrate that the as-cast alloy exhibits a dual-phase structure comprising BCC and FCC phases. After cold rolling and annealing, the alloy develops a dual-phasic heterogeneous structure, wherein the BCC phase transforms into a "hard-encapsulated-soft" structure and the FCC phase evolves into a "mixed-grain" structure. This microstructural modification enables a synergistic enhancement in strength and ductility of the alloy. The improvement in ductility is primarily attributed to the enhanced deformability of the BCC phase facilitated by the "hard-encapsulated-soft" structure, while the increase in strength is predominantly ascribed to the hetero-deformation-induced (HDI) strengthening effect and microstructural refinement resulting from the dual-morphology heterogeneous structure.

Key words： metallic materials multi-principal element alloys thermomechanical processing mechanical properties heterogeneous structure

收稿日期: 2025-01-16

ZTFLH:

TG13

基金资助:沈阳航空航天大学航空制造工艺数字化国防重点学科实验室开放基金(SHSYS202205);辽宁省高校基本科研业务项目(LJ212410143012);辽宁省高校基本科研业务项目(LJ232410143021);沈阳航空航天大学大学生创新创业训练计划(D202410181358484165)

通讯作者: 张璐，副教授，zhanglu5853@163.com，研究方向为多主元合金成分设计及强韧化机制研究

Corresponding author: ZHANG Lu, Tel: 15840198862, E-mail: zhanglu5853@163.com

作者简介: 王君阳，男，2002年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2025.034 或 https://www.cjmr.org/CN/Y2025/V39/I12/952

图1 SS 合金的SEM 显微组织

表1 SS合金中两相的化学成分

图2 CA合金的SEM显微组织

表2 CA合金不同区域的化学成分

图3 CA合金基体区的TEM照片

表3 CA合金中不同区域相的化学成分

图4 CA合金中再结晶区的TEM照片

图5 Fe40Cr35Ni20Al3合金的组织演变示意图

图6 两种合金的室温拉伸应力-应变曲线以及屈服强度和延伸率的比较

图7 CA合金中A区域的变形过程示意图

图8 CA合金中B区域的变形过程示意图

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