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Indexed by:期刊论文

Date of Publication:2017-02-01

Journal:WELDING JOURNAL

Included Journals:SCIE、EI

Volume:96

Issue:2

Page Number:63S-70S

ISSN No.:0043-2296

Key Words:Continuous Drive Friction Welding; Aluminum/Copper Dissimilar Joints; Postweld Heat Treatment; Mechanical Property; Intermetallic Compounds

Abstract:Continuous drive friction welding of commercial pure aluminum to copper bars was conducted. Sound joints were produced after postweld heat treatment (PWHT) at 100 degrees C for 2 h with an ultimate tensile strength of 91 MPa and a bending angle of 90 deg without breaking. All heat-treated tensile samples failed at the aluminum/copper interface with a cleavage fracture feature. The microstructure, composition, and fractograph of the joints were analyzed with an electron probe microanalyzer and a scanning electron microscope. Copper was stirred into the aluminum matrix due to mechanical excavation during welding. After PWHT at 100 degrees C for 2 h, the minimized amount of Cu distributed at the interface, which benefited the mechanical property of the joints. Massive formations of brittle intermetallic compounds (IMCs) at the interface could deteriorate the mechanical property of joints. Fractographs revealed that Al-Cu IMCs initially formed at one-third of the radius of the Paying surface due to comprehensive influences of rotation speed and friction pressure.