Dynamic recrystallization and dynamic precipitation mechanism of Mg-Gd-Y-Zr alloy during hot compression

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-05-08 DOI:10.1016/j.vacuum.2025.114400

Dongzhen Wang , Xiaoya Chen , Quanan Li , Hongxi Zhu , Zhenliang Zhao , Qiansen Liu , Tianyao Guo

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引用次数: 0

Abstract

This paper investigated the hot - compression deformation behavior of Mg-12Gd-0.5Zr and Mg-12Gd-4Y-0.5Zr alloys at 350–500 °C and 0.002–1 s⁻¹. The dynamic recrystallization (DRX) critical strain model of the alloy was established, the critical strain of DRX was calculated, and its accuracy was verified by TEM characterization. Y addition promoted DRX nucleation and growth through continuous dynamic recrystallization (CDRX), weakening the (0001) basal texture. Y reduced the DRX critical strain, triggering earlier DRX. At 400 °C/0.002 s⁻¹/ε = 0.7, the main nucleation mechanism for both alloys were CDRX. Discontinuous dynamic recrystallization (DDRX) only formed single-layer DRX grains at deformed grain boundaries initially and aided CDRX nucleation. A schematic of the DRX nucleation-growth mechanism was created. Dynamic precipitates formed before DRX, nucleating at deformed grain boundaries. After Y addition, the alloy's dynamic precipitates were the face - centered cubic β-Mg₅(Gd, Y) phase. The number of precipitates increased, forming clusters on grain boundaries. They hindered dislocation motion, pinned grain boundaries, promoted DRX nucleation, and restricted DRX grain growth.

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Mg-Gd-Y-Zr合金热压缩过程动态再结晶及动态析出机理

研究了Mg-12Gd-0.5Zr和Mg-12Gd-4Y-0.5Zr合金在350 ~ 500℃和0.002-1 s−1条件下的热压缩变形行为。建立了合金动态再结晶（DRX）临界应变模型，计算了DRX临界应变，并通过TEM表征验证了模型的准确性。Y的加入通过连续动态再结晶（CDRX）促进了DRX的形核和生长，削弱了（0001）基织构。Y降低DRX临界应变，触发早期DRX。在400℃/0.002 s−1/ε = 0.7时，两种合金的主要形核机制均为CDRX。不连续动态再结晶（DDRX）最初仅在变形晶界处形成单层DRX晶粒，并辅助CDRX成核。建立了DRX成核生长机理示意图。动态析出相在DRX之前形成，在变形晶界处形核。添加Y后，合金的动态析出相为面心立方β-Mg5（Gd， Y）相。析出相数量增加，在晶界处形成团簇。它们阻碍位错运动，固定晶界，促进DRX成核，限制DRX晶粒长大。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.