The evolution behavior and mechanism of γ' particles during hot deformation in a new P/M nickel-based superalloy

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-09-11 DOI:10.1016/j.matchar.2024.114359

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Abstract

Double-cone (DC) hot compression experiments were carried out for the hot extruded (HEXed) new powder metallurgy (P/M) nickel-based superalloy A1, and the evolution behavior, mechanism of γ' particles in the process of hot deformation of A1 alloy were investigated. The consequences indicate that a rise in strain and strain rate promotes the dissolution of secondary γ' phases (γ'_s) as well as the dissolution and precipitation of primary γ' phases (γ'_p), and the deformation temperature mainly promotes the dissolution of γ' particles. The distribution of γ' particles in the deformed and dynamic recrystallized (DRXed) grains is different, and the grain boundary (GB) migration that occurs during DRX leads to the dissolution and reprecipitation of γ' particles at the interface front. Dislocation accumulation leads to the deformation of γ' particles, which are elongated along the vertical strain direction. Some of the γ'_p split due to the stress concentration brought about by dislocation accumulation and the γ'_s are sheared by dislocations. The evolution of γ' particles is a diffusion-controlled process, and the GBs and dislocations can be used as an additional diffusion channel for solute elements.

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新型 P/M 镍基超级合金热变形过程中 γ' 粒子的演化行为和机制

对热挤压（HEXed）新型粉末冶金（P/M）镍基超级合金 A1 进行了双锥体（DC）热压缩实验，研究了 A1 合金热变形过程中γ'颗粒的演化行为和机理。结果表明，应变和应变速率的增加会促进次生γ'相（γ's）的溶解以及原生γ'相（γ'p）的溶解和析出，而变形温度主要会促进γ'颗粒的溶解。γ'颗粒在变形晶粒和动态再结晶（DRX）晶粒中的分布是不同的，DRX过程中发生的晶界（GB）迁移导致了γ'颗粒在界面前沿的溶解和再沉淀。位错累积导致γ'颗粒变形，沿垂直应变方向拉长。由于位错堆积带来的应力集中，部分γ'p发生分裂，γ'颗粒被位错剪切。γ'颗粒的演变是一个扩散控制过程，GBs和位错可作为溶质元素的额外扩散通道。

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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.