Microstructure and Mechanical Properties of Exothermic-Reaction-Assisted Friction-Stir-Welded Nickel-Aluminum Bronze Alloy
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In the present work, nickel-aluminum bronze alloy is joined using conventional friction stir welding (CFSW) and thermite heat-assisted friction stir welding (THAFSW). In this experiment, preheating technology was utilized using the thermite reaction of Al-CuO powder. A substantial rise in temperature was observed during THAFSW which is beneficial to the eliminations of tunnel defect. In THAFSW, a large amount of α-phase was observed from the top to the center in stir zone as a result of the rise in temperature. Transverse tensile strength of the THAFSW and CFSW was improved by 27 and 14%, respectively, in comparison with base metal tensile strength. A higher microhardness values observed at the bottom of the stir zone in the THAFSW, while this was seen higher in the surface zone and the center zone in the case of CFSW. Tool wear was reduced during the THAFSW process.
Keywordsnickel-aluminum bronze alloy tensile strength thermite heat-assisted friction stir welding tunnel defect microstructure
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