摘要
析出强化型高熵合金实现了强度-塑性的良好结合,具有广阔的工程应用前景。增材制造的快速凝固特性在合金中引入了独特的非均匀微观组织特征,而在析出强化型高熵合金中,这些特征组织会显著改变合金的析出行为并最终影响合金的力学性能。综述了增材制造析出强化型高熵合金的4种典型组织特征:异形晶粒形貌、凝固偏析、原位生成第二相和位错网络;重点关注了这些组织对后续热处理过程中析出行为(形核生长及粗化)的影响机制;进一步阐述了该类合金的拉伸性能、强化机理和变形行为,总结了目前的研究进展并展望了未来的研究方向。
Additively manufactured precipitation-strengthened high-entropy alloys exhibit excellent synergy between strength and ductility,demonstrating promising prospects for engineering applications.The rapid solidification characteristics inherent to additive manufacturing introduce unique heterogeneous microstructural features that significantly alter the precipitation behavior and ultimately affect the mechanical properties of these alloys.This review systematically summarizes four typical microstructural characteristics found in additively manufactured precipitation-strengthened high-entropy alloys:heterogeneous grain morphology,solidification segregation,in-situ formed secondary phases,and dislocation networks.Special emphasis is placed on the mechanisms by which these characteristics influence precipitation behavior,including nucleation,growth,and coarsening,during subsequent heat treatment.The tensile properties,strengthening mechanisms,and deformation behavior of these alloys are comprehensively discussed.Finally,current research progress is summarized,and future research directions are proposed.
作者
王松宇
吴宜霞
何峰
WANG Songyu;WU Yixia;HE Feng(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《铸造技术》
2025年第8期774-788,共15页
Foundry Technology
基金
国家自然科学基金(52474425)
凝固技术全国重点实验室研究基金(2023-QZ-02)。
关键词
高熵合金
析出强化
增材制造
微观组织
力学性能
high-entropy alloy
precipitation strengthening
additive manufacturing
microstructure
mechanical properties
