J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (7): 630-636.DOI: 10.1016/j.jmst.2017.02.003

Special Issue: 2017-2018年Mg合金专题

• Orginal Article • Previous Articles     Next Articles

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

Li Zhenlianga*(), Liu Feia, Yuan Aipinga, Duan Baoyub, Li Yimingb, Li Xiaoweib   

  1. a School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China
    b Analysis and Test Center, Inner Mongolia University of Science & Technology, Baotou 014010, China
  • Received:2016-06-24 Revised:2016-10-16 Accepted:2016-11-15 Online:2017-07-20 Published:2017-08-29
  • Contact: Li Zhenliang

Abstract:

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)Al2 phase (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 (101?3) were increased. In contrast, those of prismatic texture {101?0} <112?0> 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.

Key words: Mg alloy, Sub-cells, Texture randomization, LPSO phase, Microcosmic plastic deformation