形变热处理对选区激光熔化制备Al8(CoCrNi)92 中熵合金组织及性能的影响

doi:10.11901/1005.3093.2024.491

材料研究学报

2025, Vol. 39

Issue (11): 870-880 DOI: 10.11901/1005.3093.2024.491

研究论文

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形变热处理对选区激光熔化制备Al₈(CoCrNi)₉₂ 中熵合金组织及性能的影响

张正统, 吴远慧, 邱应堃, 涂坚(

)

重庆理工大学材料科学与工程学院重庆 400054

Effect of Thermo-mechanical Treatment on Microstructure and Properties of Medium-entropy Alloy Al₈(CoCrNi)₉₂ Prepared by Selective Laser Melting

ZHANG Zhengtong, WU Yuanhui, QIU Yingkun, TU Jian(

)

College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China

引用本文:

张正统, 吴远慧, 邱应堃, 涂坚. 形变热处理对选区激光熔化制备Al₈(CoCrNi)₉₂ 中熵合金组织及性能的影响[J]. 材料研究学报, 2025, 39(11): 870-880.
Zhengtong ZHANG, Yuanhui WU, Yingkun QIU, Jian TU. Effect of Thermo-mechanical Treatment on Microstructure and Properties of Medium-entropy Alloy Al₈(CoCrNi)₉₂ Prepared by Selective Laser Melting[J]. Chinese Journal of Materials Research, 2025, 39(11): 870-880.

全文: PDF(30277 KB) HTML

摘要:

研究了后处理工艺对用选区激光熔化(SLM)技术制备的Al₈(CoCrNi)₉₂中熵合金的微观组织和性能的影响。结果表明，SLM打印态合金具有胞状位错结构和典型的柱状晶组织。用后续热处理虽然可诱导这种合金一定程度的再结晶，但是消除宏观缺陷的效果甚微。相比之下，形变热处理能显著优化这种合金的微观结构，几乎完全消除了孔隙和微裂纹并诱导形成多相异质结构，使其硬度显著提高。

关键词 ：金属材料, 选区激光熔化, 形变热处理, 异质结构

Abstract：

Selective laser melting (SLM) offers a novel pathway for fabricating medium-entropy alloys (MEAs), yet the process inherently introduces defects such as porosity and microcracks, which are challenging to eliminate solely through subsequent heat treatment. Herein, the influence of various post-processing treatments on the microstructure and hardness of an Al₈(CoCrNi)₉₂ MEA was assessed. It was found that the as-printed alloy exhibits a typical columnar grain structure with cellular dislocation structure. While subsequent heat treatment alone induced a certain degree of recrystallization, its effect on mitigating macroscopic defects was minimal. In contrast, thermomechanical processing significantly refined the microstructure, nearly eliminated entirely the pores and microcracks, and induced the formation of a heterogeneous multiphase structure, consequently leading to a substantial enhancement in hardness. This research demonstrates that thermomechanical processing, as an effective post-processing route, can optimize the microstructure of SLM-fabricated MEAs, alleviate inherent defects related with the additive manufacturing technique, and markedly improve their mechanical properties.

Key words： metallic materials selective laser melting thermomechanical treatment heterogeneous microstructure

收稿日期: 2024-12-12

ZTFLH:

TG139

基金资助:重庆理工大学研究生创新项目(gzlcx20233008)

通讯作者: 涂坚，副教授，tujian@cqut.edu.cn，研究方向为高熵合金组织与性能

Corresponding author: TU Jian, Tel: (023)62563178, E-mail: tujian@cqut.edu.cn

作者简介: 张正统，男，2000年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.491 或 https://www.cjmr.org/CN/Y2025/V39/I11/870

图1 Al8(CoCrNi)92选择性激光熔化(SLM)工艺的示意图

图2 打印态试样和形变态试样的ECCI图

图3 打印态试样和形变态试样的EBSD图

图4 热处理后Al8(CoCrNi)92试样的ECCI图

图5 热处理Al8(CoCrNi)92试样的EBSD图

图6 形变热处理Al8(CoCrNi)92试样的ECCI图

图7 形变热处理Al8(CoCrNi)92试样的EBSD图

图8 形变热处理Al8(CoCrNi)92试样的EDS图

图9 不同后处理Al8(CoCrNi)92试样的XRD谱

图10 不同处理Al8(CoCrNi)92试样的维氏硬度

图11 不同后处理Al8(CoCrNi)92试样的硬度

图12 经过不同后处理Al8(CoCrNi)92试样的微观组织结构演变示意图

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