Improved mechanical properties of cast Mg alloy welds via texture weakening by differential rotation refill friction stir spot welding
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In: Scripta Materialia, Vol. 203, 114113, 01.10.2021.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Improved mechanical properties of cast Mg alloy welds via texture weakening by differential rotation refill friction stir spot welding
AU - Fu, Banglong
AU - Shen, Junjun
AU - Suhuddin, Uceu F.H.R.
AU - Chen, Ting
AU - dos Santos, Jorge F.
AU - Klusemann, Benjamin
AU - Rethmeier, Michael
PY - 2021/10/1
Y1 - 2021/10/1
N2 - Cast magnesium alloys welds produced by refill friction stir spot welding (refill FSSW) show low lap shear strength (LSS) and constantly fail in stirred zone (SZ) shear mode. The cause is most probably related to the heavily textured microstructure. Here, to re-engineer the resulting microstructure, we propose a novel process variant, the differential rotation refill FSSW (DR-refill FSSW). DR-refill FSSW stimulates discontinuous dynamic recrystallization and produces a bimodal microstructure with weakened texture. Therefore, the deformation incompatibility between SZ and thermal-mechanically affected zone is avoided. The welds have 50% higher LSS than that of standard refill FSSW welds, and fail in a different failure mode, i.e., SZ pull-out mode. DR-refill FSSW provides a new and effective strategy for improving the performance of spot welds based on microstructural engineering.
AB - Cast magnesium alloys welds produced by refill friction stir spot welding (refill FSSW) show low lap shear strength (LSS) and constantly fail in stirred zone (SZ) shear mode. The cause is most probably related to the heavily textured microstructure. Here, to re-engineer the resulting microstructure, we propose a novel process variant, the differential rotation refill FSSW (DR-refill FSSW). DR-refill FSSW stimulates discontinuous dynamic recrystallization and produces a bimodal microstructure with weakened texture. Therefore, the deformation incompatibility between SZ and thermal-mechanically affected zone is avoided. The welds have 50% higher LSS than that of standard refill FSSW welds, and fail in a different failure mode, i.e., SZ pull-out mode. DR-refill FSSW provides a new and effective strategy for improving the performance of spot welds based on microstructural engineering.
KW - EBSD
KW - Magnesium alloy
KW - Plastic deformation
KW - Refill friction stir spot welding
KW - Texture
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85109440699&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/53033d88-4cf9-34a1-ade0-63b4c2741a50/
U2 - 10.1016/j.scriptamat.2021.114113
DO - 10.1016/j.scriptamat.2021.114113
M3 - Journal articles
AN - SCOPUS:85109440699
VL - 203
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
M1 - 114113
ER -