Billets of Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy were produced by spray-deposition（the Osprey process）.Effect of rolling deformation（T = 350？C, ε = 5%, 10%, and 15%, respectively） on microstructure and texture evolution ...Billets of Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy were produced by spray-deposition（the Osprey process）.Effect of rolling deformation（T = 350？C, ε = 5%, 10%, and 15%, respectively） on microstructure and texture evolution of the Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy was investigated by scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and X-ray diffraction（XRD）. Results show that at pass reduction of ε = 5%, 10% and 15% at 350？C respectively, Mg-Nd-Zn typed 24R-LPSO structure was formed in（Ca, Nd）Al2phase（C15 Laves phase）. With the increase in pass reduction（i.e. 5%, 10% and 15%）, the texture pole density level of basal texture（0002） changed little and pyramidal texture（10 1ˉ3） were increased.In contrast, those of prismatic texture {101ˉ0} 〈11 2ˉ0〉 were increased initially and followed by a reduction, indicating texture randomization in the grain-refined Mg alloy. The combined contribution of LPSO phase and C15 phase was key to randomize the texture of the grain-refined Mg alloy. It was noted that the microcosmic plastic deformation of LPSO phase and nanometer-sized dispersed C15 phase impeded dislocation movement, led to dislocation tangles, and facilitated recrystallization.展开更多
基金financial support by the National Natural Science Foundation of China (No. 51364032)
文摘Billets of Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy were produced by spray-deposition（the Osprey process）.Effect of rolling deformation（T = 350？C, ε = 5%, 10%, and 15%, respectively） on microstructure and texture evolution of the Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy was investigated by scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and X-ray diffraction（XRD）. Results show that at pass reduction of ε = 5%, 10% and 15% at 350？C respectively, Mg-Nd-Zn typed 24R-LPSO structure was formed in（Ca, Nd）Al2phase（C15 Laves phase）. With the increase in pass reduction（i.e. 5%, 10% and 15%）, the texture pole density level of basal texture（0002） changed little and pyramidal texture（10 1ˉ3） were increased.In contrast, those of prismatic texture {101ˉ0} 〈11 2ˉ0〉 were increased initially and followed by a reduction, indicating texture randomization in the grain-refined Mg alloy. The combined contribution of LPSO phase and C15 phase was key to randomize the texture of the grain-refined Mg alloy. It was noted that the microcosmic plastic deformation of LPSO phase and nanometer-sized dispersed C15 phase impeded dislocation movement, led to dislocation tangles, and facilitated recrystallization.
