Precipitation behavior of the secondary L12-Al3(Sc, Zr) phase in the SLM fabricated Al-4Cu-2Mg-0.3Sc-0.7Zr alloy during aging process

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

Vacuum Pub Date : 2025-04-23 DOI:10.1016/j.vacuum.2025.114365

Haolan Zhang , Zhongwei Chen , Weijiang Song , Yijun Wu , Bo An

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Abstract

The precipitation behavior of the secondary L1₂-Al₃(Sc, Zr) precipitates in the selective laser melting (SLM) fabricated Al-4Cu-2Mg-0.3Sc-0.7Zr alloy is investigated. And the distribution of Sc and Zr atoms in the secondary Al₃(Sc, Zr) precipitates at different aging temperatures was studied by HAADF-STEM. The secondary L1₂-Al₃(Sc, Zr) precipitates are predominantly comprise Al and Sc atoms after direct aging at 225 °C for 2.5 h, and this indicating that Sc elements primarily control the nucleation and the growth of the L1₂-Al₃(Sc, Zr) phase at 225 °C. The distinct Al₃Sc-rich core and Al₃Zr-rich shell structure were observed when the aging temperature increases to 440 °C, and both Sc atoms and Zr atoms actively participate in the nucleation and growth of Al₃(Sc, Zr) particles at 440 °C. Furthermore, Cu element enriched at the interface between Al₃(Sc, Zr) precipitate and Al matrix following direct aging treatment at 440 °C for 0.5 h. And during non-isothermal aging process, the oxidation was observed occurs at the grain boundary mainly when the aging temperatures were higher than 440 °C.

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时效过程中Al-4Cu-2Mg-0.3Sc-0.7Zr合金中次生L12-Al3（Sc, Zr）相的析出行为

研究了选择性激光熔化（SLM）制备的Al-4Cu-2Mg-0.3Sc-0.7Zr合金中L12-Al3（Sc, Zr）次生相的析出行为。利用HAADF-STEM研究了不同时效温度下次生Al3（Sc, Zr）析出物中Sc和Zr原子的分布。225℃直接时效2.5 h后，次生析出的L12-Al3（Sc, Zr）相主要由Al和Sc原子组成，表明在225℃时Sc元素主要控制L12-Al3（Sc, Zr）相的形核和长大。当时效温度升高到440℃时，观察到明显的富al3sc核和富al3zr壳结构，440℃时Sc原子和Zr原子都积极参与Al3（Sc, Zr）粒子的形核和生长。在440℃直接时效0.5 h后，Cu元素富集于Al3（Sc, Zr）析出物与Al基体的界面处。在非等温时效过程中，时效温度高于440℃时晶界处主要发生氧化。

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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.