High Temperature Creep Behavior and Effects of Stacking Fault Energy in Mg-Y and Mg-Y-Zn Dilute Solid Solution Alloys

Abstract:

Compressive creep behavior of hot-rolled (40%) Mg-Y binary and Mg-Y-Zn ternary dilute solid solution alloys are investigated in this study. Creep strength is substantially improved by the addition of zinc. Activation Energy for creep in Mg-Y and Mg-Y-Zn alloys are around 200 kJ/mol at the temperature range from 480 to 570 K. These values are higher than the activation energy for self-diffusion coefficient in magnesium (135 kJ/mol). Many stacking faults, which are planar type defects are observed on the basal planes of the magnesium matrix in Mg-Y-Zn ternary alloys. TEM observation has been revealed that the non-basal a-dislocation slip is significantly activated by these alloys. The rate controlling mechanism of Mg-Y and Mg-Y-Zn dilute alloys are considered to the cross-slip or prismatic-slip controlled dislocation creep with high activation energy for creep, more than 1.5 times higher than the activation energy for creep controlled dislocation climb.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 491-496
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.491
• Online since: May 2014
• Authors: Mayumi Suzuki*, Yasuyuki Murata, Kyosuke Yoshimi
• Keywords: Activation Energy, Creep Strength, Dislocation Substructure, Mg-Y Alloys, Microalloying Stacking Fault Energy

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