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Indexed by:期刊论文

Date of Publication:2018-11-01

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Included Journals:SCIE、Scopus

Volume:27

Issue:11

Page Number:5879-5888

ISSN No.:1059-9495

Key Words:fracture; intermetallic compounds; Mg; Al welding; Mg-Cd-Al multi-component alloy; microstructure

Abstract:AZ31 Mg and 6061 Al were successfully joined by GTAW method with Cd as filler metal. The tensile strength of the joints reached 170MPa through this alloying method according to Mg-Cd-Al ternary system. The microstructure, phases, element distribution and fracture mechanism of alloyed joints were studied. The results suggest that the fusion zone is mainly composed of CdMg compounds and Al-based solid solution. A transitional zone thickness of 40-80m with few primary Al12Mg17 and fine Al12Mg17-MCMS (MCMS represents a mixture of CdMg and CdMg3 compounds) eutectic is formed between the AZ31 base metal and fusion zone. The fracture surface presents three distinct regions because of the different distribution of Al12Mg17 compounds in the transitional zone. The alloying with Cd filler metal can disperse Al12Mg17 intermetallic compounds and form CdMg ordered compounds with excellent plasticity. Thus, the mechanical properties of alloyed joints have been significantly enhanced.