Hot deformation behavior of Mg2B2O5 whiskers reinforced AZ31B magnesium composite fabricated by stir-casting

Constitutive equation for the hot deformation behavior of Csf/AZ91D composites and its validity for numerical simulation

“…However, it is very close to the value of the apparent activation energy of whisker reinforced magnesium composites [10,22] , in which the deformation mechanism is identified as diffusion controlled dislocation climb.…”

“…These metallurgical transformations combine to yield a more significant strain softening, i.e. the decline of flow stress with the increase of plastic strain, than that of the magnesium alloy [8][9][10] . Consequently, the flow stress of magnesium matrix composites is determined not only by the deformation temperature and strain rate but also by the plastic strain largely.…”

Deformation Mechanism of Mg-4Sn-1.5Pb Alloy

“…We need to make further calculation and analysis to judge the deformation mechanism. One simple approach to confirm that if the value of stress exponent is reasonable or not (which suggests the deformation mode of the materials following either dislocation climb creep or dispersion strengthened) is to find the threshold stress [4][5][6][7][8][9]. The threshold stress is calculated to confirm whether there is a threshold stress σ 0 in Mg-4Sn-1.5Pb alloy.…”

Hot Compression Deformation Behavior of the Mg-5Sn-2.5Pb Magnesium Alloy

“…Various constitutive equations have been used to describe the stress-strain relationship of hot deformed alloys. The Arrhenius equation has been widely used to describe the stress-strain relationship, especially at a wide range of temperature and strain rate [14][15][16]. Therefore, in the present study the Arrhenius equation 1…”

“…The stress reach to a steady state is mainly attributed to work hardening and softening reach a dynamic equilibrium, the dislocation density remains relatively constant, the softening phenomenon is due to the dynamic recovery (DRV) and dynamic recrystallization (DRX) [8,[12][13]. The flow stress significantly affected by strain rate and deformation temperature [12][13][14]. The peak stress decreases with the increasing of deformation temperature and the decreasing of strain rate, as shown in Fig…”