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Metals 2017, 7(9), 361; doi:10.3390/met7090361

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Key Lab of Robot & Welding Automation of Jiangxi Province, Mechanical & Electrical Engineering School, Nanchang University, Nanchang 330031, China
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Received: 20 July 2017 / Revised: 19 August 2017 / Accepted: 7 September 2017 / Published: 11 September 2017
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Abstract

The microstructure and mechanical properties of Al/Cu ultrasonic welding joints were investigated. Results show that: (i) the joint strength increased when the welding time increased within a certain range, and a maximal resistant force of 163.04 N was obtained when the welding duration and welding static pressure were 200 ms and 7.2 MPa, respectively; (ii) with a further increase of welding time, the bonding interface was gradually occupied by a thick strip layer of brittle Al2Cu (θ2) phase, thus decreasing the strength; (iii) the maximum temperature in the welding region was 360 °C during the welding process, and a recrystallization phenomenon was identified near the welding interface; (iv) the average nanohardness of Cu, the Cu-Al interfacial reaction layer and Al were 1.04 GPa, 1.34 GPa, and 0.53 GPa, respectively, which is consistent with the formation of the intermetallic compound identified by energy-dispersive X-ray spectroscopy (EDS) and XRD analysis. View Full-Text
Keywords: ultrasonic welding; aluminum; copper; microstructure; mechanical property; nanoindentation ultrasonic welding; aluminum; copper; microstructure; mechanical property; nanoindentation
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Liu, G.; Hu, X.; Fu, Y.; Li, Y. Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper. Metals 2017, 7, 361.

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