Cascading texture evolution driven by dynamic competition of deformation mechanisms in Inconel 625 Ni-based superalloy prepared by laser powder bed fusion

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-19 DOI:10.1016/j.matchar.2025.115582

Xingqun Zhang , Jian Tu , Tingzhou He , Qiyuan Zhang , Yanxiang Liang

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引用次数: 0

Abstract

The heterogeneous microstructure inherent in Inconel 625 Ni-based superalloy produced by laser powder bed fusion (LPBF) leads to complications in its deformation behavior. This study comprehensively investigates the competitive deformation mechanisms and texture evolution using multi-scale characterization techniques and twin trace/resolved shear stress analyses. Initially, dislocation slip dominates, weakening the inherent cubic texture. With increasing strain, deformation twinning preferentially activates in cubic and copper-oriented grains. Synergistically, stress concentration at twin boundaries and twin/matrix structural heterogeneity trigger shear band formation, driving the evolution towards α-fiber textures. This work elucidates the dynamic interplay of slip, twinning, and shear banding in LPBF Inconel 625 superalloy, offering a foundation for microstructural design to optimize performance.

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激光粉末床熔合制备Inconel 625镍基高温合金中变形机制动态竞争驱动的级联织构演化

激光粉末床熔合法制备的Inconel 625镍基高温合金由于其组织的非均匀性，导致其变形行为复杂。本研究利用多尺度表征技术和双迹/分辨剪切应力分析全面研究了竞争变形机制和织构演变。最初，位错滑移占主导地位，削弱了固有的立方织构。随着应变的增加，变形孪晶优先在立方晶和铜取向晶中激活。孪晶边界处的应力集中和孪晶/基体结构的非均质性共同触发了剪切带的形成，推动了α-纤维织构的演化。本研究阐明了LPBF Inconel 625高温合金中滑移、孪晶和剪切带的动态相互作用，为优化性能的显微组织设计提供了基础。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.