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Enhanced very high cycle fatigue performance of extruded Mg-12Gd-3Y-0.5Zr magnesium alloy |
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| Authors: | F Yang F LvXM Yang SX LiZF Zhang QD Wang |
| Affiliation: | a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China b National Engineering Research Center of Light Alloys Net Forming, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China |
| Abstract: | Very high-cycle fatigue behaviors of extruded Mg-12Gd-3Y-0.5Zr (GW123k) magnesium alloy have been investigated and compared to that of conventional extruded AZ31 magnesium alloy. Typical post-fatigue microstructure and surface morphology features are presented for both the GW123k and the AZ31 alloy in order to stand out the uniqueness of GW123k alloy. Respective fatigue damage mechanisms for both alloys were also proposed in accordance. It is found that GW123k alloy contains a large amount of precipitated particles and possesses a relatively weak texture, which give rise to its much relieved tension-compression yield asymmetry and enhanced fatigue failure resistance. The much homogenized deformation mechanism in GW123k alloy is considered the underline reason for the improvement of material's fatigue performance. |
| Keywords: | Mg-Gd-Y-Zr alloy AZ31 alloy Very high cycle fatigue Crack initiation Yield asymmetry Texture |
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