Effect of Microstructural Changes by Friction Stir Processing on the Clad-to-Core Interfacial Strength of Thin Aluminum-Clad Aluminum Sheets

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-08-31 DOI:10.1007/s12540-024-01776-9

Kun Gao, Guiqi Liu, Sung-Tae Hong, Soumyabrata Basak

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Abstract

The present study successfully utilizes friction stir processing (FSP) as a surface engineering tool on an AA4343-clad AA3003 sheet to improve the interfacial strength through microstructural homogenization. Compared to the base material condition, electron back-scattered diffraction analysis after FSP reveals a considerable reduction in grain morphological disparity between the clad layer and the core due to the occurrence of grain refinement by continuous dynamic recrystallization. Scanning electron microscopy (SEM) analysis reveals various Si-induced precipitations, including Al (Mn, Fe) Si, within the stir zone due to the diffusion of Si from the clad layer to the core during FSP. The influence of microstructural changes on improving the mechanical properties of the bi-layer clad sheet is also examined. The surface microhardness values of the clad (~ 28.7 Hv) and core (~ 35.5 Hv) for the base material condition are found to be improved to ~ 34.7 Hv and 38.5 Hv, respectively, after FSP. Besides, the overall strength of the FSPed clad sheet increases by ~ 45% compared to the base material conditions. The microstructural homogenization and Si-induced precipitates act together to strengthen the interface in the clad material system. SEM images on the fractured surfaces of the tensile specimens reveal delamination between the AA4343 (clad layer) and AA3003 (core) for the base material condition, which disappears after FSP.

Graphical Abstract

Abstract Image

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摩擦搅拌加工的微观结构变化对薄铝板包层与芯材界面强度的影响

本研究成功地在 AA4343 覆层 AA3003 板材上利用摩擦搅拌加工（FSP）作为一种表面工程工具，通过微观结构均匀化来提高界面强度。与基体材料相比，FSP 后的电子反向散射衍射分析表明，由于连续动态再结晶产生了晶粒细化，包覆层与芯材之间的晶粒形态差异显著减小。扫描电子显微镜（SEM）分析表明，由于在快熔固化过程中硅从包覆层向芯部扩散，在搅拌区内出现了各种由硅引起的析出物，包括铝（锰、铁）硅。此外，还研究了微结构变化对改善双层覆层板机械性能的影响。结果发现，在 FSP 之后，基材条件下的覆层表面显微硬度值（~ 28.7 Hv）和芯材表面显微硬度值（~ 35.5 Hv）分别提高到了~ 34.7 Hv 和 38.5 Hv。此外，与基本材料条件相比，经过 FSP 处理的覆层板的整体强度提高了约 45%。微结构均质化和矽诱导析出物共同作用，强化了覆层材料体系的界面。拉伸试样断裂表面的扫描电子显微镜图像显示，在基体材料条件下，AA4343（覆层）和 AA3003（芯材）之间存在分层，而在 FSP 之后，分层现象消失了。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.