Microstructural evolution and mechanical properties of Mg-9.8Gd-2.7Y-0.4Zr alloy produced by repetitive upsetting

• Published in: Journal of materials science & technology Vol. 34; no. 7; pp. 1067 - 1075
• Main Authors: Zhou, H., Ning, H.Y., Ma, X.L., Yin, D.D., Xiao, L.R., Sha, X.C., Yu, Y.D., Wang, Q.D., Li, Y.S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2018
• Subjects: Mechanical properties; Mg-RE alloy; Repetitive upsetting (RU); Severe plastic deformation (SPD); Mechanical properties; Mg-RE alloy; Severe plastic deformation (SPD); Repetitive upsetting (RU)
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2018.01.009

A newly developed severe plastic deformation (SPD) technique, i.e. repetitive upsetting (RU), is employed to improve the strength and ductility of a Mg-Gd-Y-Zr alloy. During the RU processing, dynamic recrystallization occurs in the Mg alloy, which leads to a significant grain refinement from 11.2 μm to 2.8 μm. The yield strength (YS), ultimate tensile strength (UTS) and elongation increase simultaneously with increasing RU passes. The microstructural evolution is affected by processing temperatures. Dynamic recrystallization prevails at low temperatures, while dynamic recovery is the main effect factor at high temperatures. Texture characteristics gradually become random during multiple passes of RU processing, which reduces the tension-compression asymmetry of the Mg-Gd-Y-Zr alloy.