Deformation Behavior and Texture Formation in AZ80 Magnesium Alloy during Uniaxial Compression Deformation at High Temperatures

Abstract

High temperature uniaxial compression deformation is conducted on AZ80 magnesium alloy at 673 and 723 K by varying the strain rates ranging from 1.0 © 10 ¹4 to 5.0 © 10 ¹2 s ¹1 in order to investigate the behaviors of deformation and texture formation. Particular attention is paid to the development of basal texture. Under the deformation conditions of this study, work softening is observed in all the stressstrain curves without exception. The results of the microstructure observation reveal occurrence of dynamic recrystallization. Formation of fiber texture during the deformation is confirmed. The main component is (0001) when the peak stresses appearing in the stressstrain curves are more than 15 20 MPa, and it develops together with an increase in the peak stress. In contrast, weak fiber textures having a main component at a position 29°a way from the basal plane are formed with deformation conditions giving peak stresses of less than 15 MPa. The stress exponent changes at a peak stress near 20 MPa, suggesting that change in the texture corresponds to the change in the deformation mechanism. It is concluded that the formation of basal texture is due to the continuous dynamic recrystallization resulting from the growth of the subgrains formed by the deformation.

Effect of Ca Precipitation on Texture Component Development in AZ Magnesium Alloy

“…This means that strain rate can affect the mechanism of dislocation movement. It has been reported and discussed that the creep mechanism has high relationship with this phenomenon in AZ80 [ 10 ].…”

“…In contrast, even if the number of activated slip systems satisfies the von Mises criteria and can accommodate the deformation, if one of the slip systems is receiving higher stress than that of its family system, the crystal rotation would shift toward its direction [ 21 ]. Results of AZ31 plane strain compression have shown that when their activated slip systems set as the prismatic <a>, but each slip system is in a non-equilibrium state, their texture component rotates during the strain is becoming increased [ 6 , 10 ].…”

“…Therefore, it is essential to understand and control the mechanism of crystallographic texture formation [ 4 , 5 ]. Especially, H. Fukutomi et al studied the relationship between deformation condition and texture formation mechanism using various type of crystal structure such as Al for face-centered cubic, Mg for HCP crystals and proposed the “Dynamic Prior Grain Growth (DPGG)” mechanism [ 6 , 7 , 8 , 9 , 10 ].…”

Effect of Recrystallization Behavior of AZ31 Magnesium Alloy on Damping Capacity

“…[10][11][12] Moreover, Fukutomi et al conducted researches using magnesium alloys with different contents in alloy, such as AZ series magnesium alloys. [13][14][15] Through these results, the formation of textures can be controlled by the variation of deformation factors such as solute atoms, deformation rate, and temperature. Considering that these factors are influenced by the activity of dislocations, they can also affect the control of damping performance.…”

Effect of Recrystallization Behavior of AZ31 Magnesium Alloy on Damping Capacity

“…In addition, the development of texture orientation in magnesium alloy is known as a factor that has a great influence on plasticity anisotropy or workability compared to other alloys [ 12 , 13 ]. One of authors conducted research using magnesium alloys with different Al contents in alloy, such as AZ series magnesium alloys [ 14 , 15 ]. Through these results, the formation of textures can be controlled by the variation in deformation factors such as solute atoms, deformation rate, and temperature.…”