کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1261557 | 971818 | 2016 | 6 صفحه PDF | دانلود رایگان |
The microstructure and mechanical properties of AZ80 magnesium alloys with varying Nd, Gd contents were investigated. The results revealed that the as-cast microstructure of AZ80 alloy was composed of α-Mg matrix and divorced eutectic β-Mg17Al12 phases. The fraction of Mg17Al12 phase was reduced when 0.6 wt.% Nd was added, and new rod-shaped Al11Nd3 phase and small block-shaped Al-Nd-Mn phase appeared. With Gd addition, the Gd elements mixed with Nd to form rare earth phases. New block-shaped Al2Gd and Al2Nd phases which were collectively called Al2RE phases were observed in the microstructure with more than 0.6 wt.% Gd addition. Moreover, the addition of Gd could promote the precipitation of block-shaped Al2RE phase, and inhibit the original rod-shaped Al11Nd3 phase. The AZ80-0.6Nd-0.6Gd alloy exhibited the optimal mechanical properties among all the experimental alloys, in which the tensile strength, yield strength and elongation were 215, 145 MPa and 8.33%, respectively.
The as-cast microstructure of AZ80 alloy is composed of α-Mg matrix and divorced eutectic β-Mg17Al12 phases. The fraction of Mg17Al12 phase is reduced when 0.6 wt.% Nd is added, and new rod-shaped Al11Nd3 phase and small block-shaped Al-Nd-Mn phase appear. The addition of Gd in the Nd modified alloy could promote the precipitation of block-shaped Al2RE phase, and inhibit the original rod-shaped Al11Nd3 phaseSEM image of as-cast experimental alloys(a) AZ80; (b) AZ80-0.6Nd; (c) AZ80-0.6Nd-0.3Gd; (d) AZ80-0.6Nd-0.6Gd; (e) AZ80-0.6Nd-0.9Gd; (f) AZ80-0.6Nd-1.2GdFigure optionsDownload as PowerPoint slide
Journal: Journal of Rare Earths - Volume 34, Issue 6, June 2016, Pages 632–637