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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 pro- pose a novel process variant, the differential rotation refill FSSW (DR-refill FSSW). DR-refill FSSW stim- ulates 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.
The first edition of this book, published within the series “Materials Science – Metals and Alloys”, provides broad knowledge of this interesting and widely applied metal from manufacturing and production to finishing and application in 13 chapters, written by 29 contributors. Each chapter is separately concluded and ends with references used.
This book fulfills its intention of conveying comprehensive and cutting‐edge knowledge of magnesium alloys. It is useful for practicing engineers, researchers and students searching for an instructional and reference source.