Aging hardening and precipitation evolution of Mg-Sc alloy with Zn alloying

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2024-10-28 DOI:10.1016/j.matlet.2024.137629

Ruxia Liu , Mengyu Zhang , Wei Zhao , Jian Zhang , Yong Xiao , Guilin Wu , Shuize Wang , Xinping Mao

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Abstract

The precipitation evolution and aging hardening effect of Zn alloying on the Mg-Sc alloy were analyzed in this study. Needle-like nanosized ScZn precipitates from the matrix at low-temperature aging, bulk-like ScZn precipitation gradually forms at high temperatures above 600 °C. Moreover, the α-phase also precipitates from the matrix during aging. The initial hardness of the solid solution β-phase alloy was almost 126.7 ± 3.2HV, the hardness of the alloy increases first and then decreases with the increase of the aging temperature from 200 °C to 600 °C. The alloy aged at 300 °C owns the highest hardness of 196.9 ± 6.9HV, further TEM reveals that the coherent nanosized α-phase precipitate with the Burgers orientation relations of β-phase and the needle-like ScZn precipitates are the main factors for the aging hardening of this Mg-Sc-Zn alloy after aging at 300 °C. These findings may provide the scientific basis for the alloying design of high-performance Mg-Sc alloys.

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含锌镁钪合金的时效硬化和析出演变

本研究分析了锌合金化对镁钪合金的析出演变和时效硬化效应。低温时效时，针状纳米 ScZn 从基体中析出；600 ℃ 以上高温时，ScZn 逐渐形成块状析出。此外，α 相也在老化过程中从基体中析出。固溶β相合金的初始硬度接近 126.7 ± 3.2HV，随着时效温度从 200 ℃ 升高到 600 ℃，合金的硬度先升高后降低。进一步的 TEM 分析表明，具有β相布格斯取向关系的相干纳米级 α 相沉淀和针状 ScZn 沉淀是该 Mg-Sc-Zn 合金在 300 ℃ 时效后发生时效硬化的主要因素。这些发现可为高性能镁钪合金的合金化设计提供科学依据。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive