Title of article
Investigation on Surface Hardness and Microstructure Evolution in AA 7075-T651 Multi-Layered Laminate Fabricated Through Friction Stir Additive Manufacturing
Author/Authors
HASSAN ، ADEEL Department of Mechanical Engineering - Universiti Teknologi PETRONAS , Awang ، Mokhtar Department of Mechanical Engineering - Universiti Teknologi PETRONAS , Pedapati ، Srinivasa Rao College of Engineering - University of Texas Permian Basin , Altaf ، Khurram Department of Mechanical Engineering - Universiti Teknologi PETRONAS , Ahmed ، Naveed Department of Industrial Engineering - College of Engineering and Architecture - Al-Yamamah University , Marode ، Roshan Vijay Department of Mechanical Engineering - Universiti Teknologi PETRONAS , Ahmed ، Syed Waqar Department of Mechanical Engineering - Universiti Teknologi PETRONAS , Soomro ، Imtiaz Ali Department of Metallurgy and Materials Engineering - Mehran University of Engineering and Technology
From page
64
To page
75
Abstract
Friction stir additive manufacturing (FSAM) is a variant of sheet lamination additive manufacturing used to produce large, near-net-shaped 3D parts. Unlike traditional friction stir lap welding, FSAM introduces a new plate to one that is already joined, with the effective area limited to the nugget zone. The present study focuses on exploring the microstructure and microhardness around the nugget zone in a five-plate AA 7075-T651 laminate synthesized at 1000 rpm and 35 mm/min. Microhardness increased vertically in the weldment NZ, reaching 143 HV in the top layer with 2.0 μm fine equiaxed grains. The grains on the advancing and retreating sides were coarser compared to the nugget zone. A W-shaped microhardness profile appeared across layer interfaces. These findings contribute significantly to advancing the FSAM technique, particularly in manufacturing multi-layered, multi-pass laminates.
Keywords
Friction stir additive manufacturing (FSAM) , AA 7075 , Surface hardness , Microstructure evolution , Grain refinement
Journal title
Iranian Journal of Materials Science and Engineering
Journal title
Iranian Journal of Materials Science and Engineering
Record number
2764940
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