Influencing mechanism of pre-existing nanoscale Al5Fe2 phase on Mg–Fe interface in friction stir spot welded Al-free ZK60–Q235 joint

Xu, R. Z.; Yang, Q.; Ni, D. R.; Xiao, B. L.; Liu, C. Z.; Ma, Z. Y.

doi:10.1016/j.jmst.2019.12.003

Title: Influencing mechanism of pre-existing nanoscale Al₅Fe₂ phase on Mg–Fe interface in friction stir spot welded Al-free ZK60–Q235 joint

Journal Article · Fri Dec 13 00:00:00 EST 2019 · Journal of Materials Science and Technology

DOI:https://doi.org/10.1016/j.jmst.2019.12.003· OSTI ID:1800031

Xu, R. Z. ^[1]; Yang, Q. ^[2]; Ni, D. R. ^[3]; Xiao, B. L. ^[3]; Liu, C. Z. ^[4]; Ma, Z. Y. ^[3]

Chinese Academy of Sciences (CAS), Beijing (China); Shenyang Aerospace University (China)
Univ. of Illinois at Urbana-Champaign, IL (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Shenyang Aerospace University (China)

Al-free ZK60 magnesium (Mg) alloy sheet was selected as substrate material of Mg–steel pinless friction stir spot welding (FSSW), avoiding the effect of the Al element in the substrate on the alloying reaction of Mg-iron (Fe) interface. The sound FSSW joint of ZK60 Mg alloy and Q235 steel with a hot-dipped aluminum (Al)-containing zinc (Zn) coating was successfully realized. The detailed microstructural examinations proved that Al₅Fe₂ phase at the Mg-Fe interface came from the pre-existing Al₅Fe₂ phase in the coating and acted as the transition layer for promoting the metallurgical bonding of Mg and Fe. The interfaces with well-matched lattice sites among Fe, Al₅Fe₂ and Mg were formed during FSSW. A low energy interface with good match of lattice sites ((002)_Al5Fe2//(110)_Fe, [110]_Al5Fe2//[13]_Fe) between Al₅Fe₂ and Fe was identified. For the interface between Al5Fe2 and Mg, an orientation relationship of ${(6 \bar{2} 2)}_{A l 5 F e 2} / / {(3 \bar{1} \bar{1} \bar{2})}_{M g} and {[1 \bar{5} \bar{8}]}_{A l 5 F e 2} / / {[2 \bar{4} 23]}_{M g}$ was observed. The tensile–shear load of the ZK60–steel joint could reach 4.6 kN. Moreover, the joint fracture occurred at the interface between the Al5Fe2 layer and the Mg alloy substrate, suggesting the brittle fracture characteristic.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-01ER45923

OSTI ID:: 1800031

Journal Information:: Journal of Materials Science and Technology, Vol. 42, Issue C; ISSN 1005-0302

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (30)

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Title: Influencing mechanism of pre-existing nanoscale Al5Fe2 phase on Mg–Fe interface in friction stir spot welded Al-free ZK60–Q235 joint

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Title: Influencing mechanism of pre-existing nanoscale Al₅Fe₂ phase on Mg–Fe interface in friction stir spot welded Al-free ZK60–Q235 joint