Cyclic Deformation of Rare-Earth Containing Magnesium Alloys

Abstract:

Cyclic deformation characteristics of a rare-earth (RE) element containing extruded Mg-10Gd-3Y-0.5Zr (GW103K) magnesium alloy were evaluated via strain-controlled low-cycle fatigue tests under varying strain amplitudes. Microstructural observations revealed that this alloy consisted of fine equiaxed grains and a large number of RE-containing precipitates. Unlike the RE-free extruded magnesium alloys, this alloy exhibited essentially cyclic stabilization and symmetrical hysteresis loop due to relatively weak crystallographic textures and reduced twinning-detwinning activities. The fatigue life of the present alloy was observed to be longer than that of the RE-free extruded magnesium alloys, which could also be described by the Coffin-Manson law and Basquins equation. Fatigue crack was observed to initiate from the specimen surface and crack propagation was basically characterized by fatigue striations.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 391-396
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.391
• Online since: March 2014
• Authors: F.A. Mirza, Dao Lun Chen*, De Jiang Li, Xiao Qin Zeng
• Keywords: Twinning, Low Cycle Fatigue, Magnesium Alloy, Rare-Earth Elements, Tension-Compression Yield Asymmetry, Texture

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