A strategy for creating ultrafine-grained microstructure in magnesium alloy sheets

Effect of speed-ratio on microstructure, and mechanical properties of Mg–3Al–1Zn alloy, in differential speed rolling

“…This variation in the distribution of the basal texture supports that shear deformation promotes the rotation of the basal planes toward the RD [9]. Unlike the previous works in the DSR processed AZ31 alloys [7,10], however, the inclination angles of the maximum basal peak with respect to ND are small at all the SRs even in the surface layers of the sheets where larger shear straining was experienced as compared to the middle layer. This may be resulted since the amount of shear deformation is not so large even at high SRs under the current rolling condition where the applied thickness reduction ratio is small as 20%.…”

“…Mukai et al [1] and Kim et al [2] succeeded in greatly enhancing the room temperature ductility in AZ magnesium alloys by adopting the equal channel angular pressing technique, which rotates the basal poles by ∼45 • from the pressing direction. In an attempt of improving ductility and strength of Mg alloys by rolling, differential speed rolling (DSR) has been studied [3][4][5][6][7]. In DSR, rotation speeds for upper and lower rolls are different such that extra shear deformation can be induced in addition to through-thickness strain.…”

“…Watanabe et al [5] and Huang et al [3,4] studied the effect of DSR temperature and thickness reduction per pass on texture and tensile properties at relatively low speed ratios of 1.1-1.2. Kim et al [6,7], on the other hand, studied the effects of DSR temperature on texture and mechanical properties at a high speed ratio of 3. Despite these works, however, the understanding of the effect of speed ratio * Corresponding author.…”

On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy

“…Recently, Kim et al [17,18] reported an exceptionally strong AZ31 alloy produced by high-ratio differential speed rolling that resulted in an ultrafine-grained structure (average grain size of 0.6 µm) giving a yield stress of 382 MPa. Razavia et al [15] reported that the grain size of AZ31 produced by ECAP could be reduced to 350 nm, giving an alloy with a yield strength of 385 MPa and ultimate tensile strength of 455 MPa with 13% ductility, which is the highest reported combined strength and ductility for an AZ31 alloy.…”

Microstructure of AZ31 Magnesium Alloy deformed by indentation-flattening compound deformation technology

“…Therefore, to improve the performance and formability of magnesium alloy at low temperature is great significance. To increase the strength and ductility of magnesium alloys by refining grain is studied by some researchers [1]. Grain of magnesium alloy sheet is refined by alternate biaxial reverse corrugation(ABRC) pressing, and the grain size is to 1.4μm [2].…”