Highly stable nanoscale amorphous microstructure at steel-aluminum interface enabled by a new solid-state additive manufacturing method. (1st April 2023)

• Record Type: Journal Article
• Authors: Zhang, M.; Liu, F.C.; Liu, Z.Y.; Xue, P.; Dong, P.; Zhang, H.; Wu, L.H.; Ni, D.R.; Ma, Z.Y.
• Is Part Of: Scripta materialia. Number 227(2023)
• Publication Date: 2023-04-01
• Subjects: Dissimilar metal welding -- Modified friction stir additive manufacture -- Nanoscale amorphous microstructure -- Intermetallic compounds -- Friction stir welding; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2023.115300
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In contrast to the established understanding that the interfacial microstructure of the bonded steel-aluminum (Fe-Al) structures coarsens significantly at elevated temperatures, this study shows that the special nanoscale interfacial layer of the Fe-Al bimetallic structures fabricated by a newly developed modified friction stir additive manufacturing (M-FSAM) exhibited extraordinary stability up to 500 °C. In tensile tests, the heat-treated Fe-Al samples failed within the aluminum alloys rather than along the Fe-Al interface. The heat treatment at 500 °C did not cause any observable microstructure change in the special nanoscale interfacial layer, which still consisted of a noncontinuous layer of Al-Fe-Si particles and a continuous Mg and O rich layer. The noncontinuous Al-Fe-Si particles were made of an amorphous-like microstructure and the Mg and O rich layer was comprised of an amorphous matrix interspersed with nanocrystalilne particles. Graphical abstract: Image, graphical abstract