Effect of rolling deformation on microstructure and texture of spray-deposited magnesium alloy containing Mg-Nd-Zn typed LPSO

• Published in: Journal of materials science & technology Vol. 33; no. 7; pp. 630 - 636
• Main Authors: Li, Zhenliang, Liu, Fei, Yuan, Aiping, Duan, Baoyu, Li, Yiming, Li, Xiaowei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2017
• Subjects: Laves相; LPSO phase; Mg alloy; Microcosmic plastic deformation; Sub-cells; Texture randomization; 喷雾沉积; 微观结构; 纹理; 轧制变形; 透射电子显微镜; 锌; 镁合金; Mg alloy; Texture randomization; Sub-cells; Microcosmic plastic deformation; LPSO phase
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2017.02.003

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.