Warm Tensile Deformation and Fracture Behavior of AZ31 Magnesium Alloy Sheets Processed by Constrained Groove Pressing

Role of processing temperature on microstructure, mechanical properties and corrosion behavior of fine grained AZ31 magnesium alloy produced by groove pressing

“…With the decreased dislocations, the level of grain refinement is affected as observed in the present work. It was also reported in the earlier work that at the higher processing temperatures for prolonged holding time due to increased groove pressing cycles, significant grain growth was noticed in AZ31 magnesium alloy [21, 25]. In both the samples processed at 250 °C and 300 °C, twins were clearly noticed.…”

“…AZ31 magnesium alloy has been widely investigated among the aluminium-zinc series alloys, due to the possible sheet production for different applications [17]. Several mechanical processes have been used to develop grain refined AZ31 magnesium alloy structures [15,[18][19][20][21]. Processing of magnesium alloys at the room temperature is difficult and therefore, warm conditions are necessarily provided to enable the other crystallographic planes to slip during the plastic deformation [22].…”

“…It was reported that, in groove pressing of AZ31 magnesium alloy, repeated heating to perform two cycles and three cycles led to counter the grain refinement and resulted grain growth [15]. AZ31 magnesium alloy was processed by constrained groove pressing at varying temperatures and the number of passes resulted defect free workpieces which were observed as increased with the increased processing temperature [21]. In another work, AZ31 magnesium alloy was processed by the same method at 300 °C and increased ductility (38.7 %) in addition to decreased tensile strength was reported [22].…”

Developing methods of constrained groove pressing technique: A review

“…Like in previous studies 61,100,103–105 of magnesium alloys, many other alloys 102,106–109 also demonstrate the characteristics of thermal stability and its effect on mechanical properties as shown in Table 3. 6061 aluminum alloy, 106 low carbon steel, 107 and NiTi alloy 102 are initially processed through CGP followed by annealing at various temperature ranges.…”

“…Initially, twins are found at room temperature and 373 K due to plastic deformation, the grain refinement occurs at 423 K and 473 K due to dynamic recrystallization, and lastly coarse grain at 523 K due to grain growth. 105 The range of 68.8–105.5 kJ/mol apparent activation energy is predicted at 423–523 K, is lesser than the lattice self-diffusion activation energy of magnesium, and comes in the range of the grain boundary diffusion activation energy. Tensile strength, yield strength, and hardness are increased to a maximum of 295 MPa, 240 MPa, and 73.9 HV from 270 MPa, 181 MPa, and 66.8 HV, respectively.…”