高压扭转Al和Mg合金中过饱和和金属间纳米相的多尺度表征

IF 2.1 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
JOM Pub Date : 2024-12-20 DOI:10.1007/s11837-024-07064-6
Yun-Hsuan Wu, Laxman Bhatta, Isshu Lee, Roberto B. Figueiredo, Megumi Kawasaki, Melissa K. Santala
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引用次数: 0

摘要

将Mg夹在Al中间,在室温下以6.0 GPa进行100转高压扭转(HPT)得到Al-Mg合金盘,在标称剪切应变为>; ~ 390的区域获得了Hv 300-350的高显微硬度。扫描电子显微镜能谱分析(EDS)显示,Mg在距离圆盘中心1.5 mm和3.0 mm处均匀分布;透射电子显微镜能谱分析(EDS)显示,Mg在纳米尺度上仍呈非均匀分布。HPT诱导了足够的混合,导致面心立方Al的过饱和Mg高达~ 20at。通过电子衍射,在接近圆盘表面的区域,即使在高剪切应变的区域,也可以在整个圆盘厚度上鉴定出β-Al3Mg2, γ-Al12Mg17和Al2Mg金属间相。该研究直观地捕获了在强机械合金化、纳米级重构和相变之后,整个样品厚度的详细成分不均匀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multi-scale Characterization of Supersaturated and Intermetallic Nanoscale Phases in Alloys Produced by High-Pressure Torsion Processing of Al and Mg Sheets

Multi-scale Characterization of Supersaturated and Intermetallic Nanoscale Phases in Alloys Produced by High-Pressure Torsion Processing of Al and Mg Sheets

Al-Mg alloy disks were produced from Mg sandwiched between Al through 100 turns of high-pressure torsion (HPT) at 6.0 GPa at room temperature, resulting in high microhardness of Hv 300–350 in regions experiencing a nominal shear strain >  ~ 390. While compositional mapping using scanning electron microscopy energy-dispersive spectroscopy (EDS) showed a uniform distribution of Mg through the disk thickness at 1.5 mm and 3.0 mm from the disk center, transmission electron microscopy EDS showed a heterogeneous distribution of Mg remained on the nanoscale. Although HPT induces enough mixing to result in face-center-cubic Al with supersaturations of Mg of up to ~ 20 at.% near the disk surfaces, β-Al3Mg2, γ-Al12Mg17 and Al2Mg intermetallic phases were identified by electron diffraction throughout the disk thickness even in regions experiencing high shear strain. This study visually captures detailed compositional heterogeneity throughout the sample thickness following intense mechanical alloying, nanoscale re-structuring and phase transformations.

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来源期刊
JOM
JOM 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.80%
发文量
540
审稿时长
2.8 months
期刊介绍: JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.
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