Solute atom segregation to I1 stacking fault and its bounding partial dislocations in a Mg–Bi alloy

IF 15.8 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Magnesium and Alloys Pub Date : 2024-08-01 DOI:10.1016/j.jma.2022.11.021
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Abstract

Stacking faults (SFs) and the interaction between solute atoms and SFs in a Mg–Bi alloy are investigated using aberration-corrected scanning transmission electron microscopy. It is found that abundant I1 SFs are generated after cold rolling and are mainly distributed inside {101¯2} twins. After aging treatment, the formation of single-layer and three-layer Bi atom segregation in the vicinity of I1 fault are clearly observed. Bi segregation also occurs at the 1/6<22¯03> bounding Frank partial dislocation cores. The segregation behaviors in I1 fault and Frank dislocations are discussed and rationalized using first-principles calculations.
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Mg-Bi合金中I1层错及其边界部分位错的溶质原子偏析
利用像差校正扫描透射电子显微镜研究了镁铋合金中的堆积断层(SFs)以及溶质原子与 SFs 之间的相互作用。研究发现,冷轧后会产生大量的 I1 SFs,主要分布在{101¯2}孪晶内部。经过时效处理后,在 I1 断层附近明显观察到单层和三层 Bi 原子偏析的形成。在 1/6<22¯03> 边界法兰克部分位错核心处也出现了铋偏析。利用第一原理计算对 I1 断层和 Frank 位错中的偏析行为进行了讨论和合理化。
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来源期刊
Journal of Magnesium and Alloys
Journal of Magnesium and Alloys Engineering-Mechanics of Materials
CiteScore
20.20
自引率
14.80%
发文量
52
审稿时长
59 days
期刊介绍: The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.
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