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Indexed by:Journal Papers

Date of Publication:2021-07-21

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Volume:29

Issue:8,SI

Page Number:5069-5079

ISSN No.:1059-9495

Key Words:fine and deformed grains; laminated composites; mechanical properties; strengthening mechanism; underwater explosive welding

Abstract:A laminated structure is applied to strengthen metal alloys by a microstructure design strategy. Explosive welding is an important manufacturing method to realize the joining of laminated composites. Therefore, in this research, three Ti layers and two Cu layers (the thickness of each layer is 0.5 mm) are stacked alternatively to produce a Ti/Cu laminated composite by underwater explosive welding. Different microstructural techniques (i.e., optical microscopy and scanning electron microscopy) all reveal that the Ti/Cu laminated composite has a characteristic laminated structure with remarkably fine and elongated grains but no cracks. Tensile testing results indicate that the Ti/Cu laminated composite has a high ultimate tensile strength that is approximately 2 times higher than the estimated value for Cu and Ti mixtures. Microscopy observations reveal that the deformed microstructure and strong bonding interface of the Ti/Cu laminated composite can activate work hardening strengthening, terminate cracks and inhibit necking simultaneously, which leads to the high ultimate tensile strength of the composite. The present laminated structure with an improved strength provides an approach to strengthen similar metal alloys.