Effect of erbium modification on the microstructure, mechanical and corrosion characteristics of binary Mg-Al alloys
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in: Journal of Alloys and Compounds, Jahrgang 648, 34680, 05.11.2015, S. 759-770.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Effect of erbium modification on the microstructure, mechanical and corrosion characteristics of binary Mg-Al alloys
AU - Seetharaman, Sankaranarayanan
AU - Blawert, Carsten
AU - Ng, Baoshu Milton
AU - Wong, Wai Leong Eugene
AU - Goh, Chwee Sim
AU - Hort, Norbert
AU - Gupta, Manoj
PY - 2015/11/5
Y1 - 2015/11/5
N2 - Abstract In this study, new erbium modified Mg-Al alloys were developed by integrating trace erbium (in the form of Al94.67Er5.33 master alloy) into pure Mg using disintegrated melt deposition technique. The developed Er- modified Mg-Al alloys were investigated for their microstructural, mechanical and corrosion characteristics in comparison with their unmodified counterparts. Microstructural investigation revealed (i) improved purity, (ii) (marginal) grain refinement, (iii) more uniform second phase distribution and (iv) Al3Er phase formation due to Er modification. Mechanical property measurements revealed an overall enhancement under indentation, tension and compression loads. A remarkable improvement in tensile ductility (without adverse effects on strength) by +19%, +29%, and +58% was obtained in Mg-3Al-0.1Er, Mg-6Al-0.3Er and Mg-9Al-0.5Er when compared to Mg-3Al, Mg-6Al and Mg-9Al respectively. While the Mg-6Al-0.3Er alloy exhibited best ductility, the Mg-9Al-0.5Er has the best strength under both tension and compression loads. Corrosion characteristics evaluated by hydrogen evolution, salt spray and electrochemical impedance experiments revealed improved corrosion resistance of Er modified Mg-Al alloys by the enhanced purity levels and the formation of Al-Er phases.
AB - Abstract In this study, new erbium modified Mg-Al alloys were developed by integrating trace erbium (in the form of Al94.67Er5.33 master alloy) into pure Mg using disintegrated melt deposition technique. The developed Er- modified Mg-Al alloys were investigated for their microstructural, mechanical and corrosion characteristics in comparison with their unmodified counterparts. Microstructural investigation revealed (i) improved purity, (ii) (marginal) grain refinement, (iii) more uniform second phase distribution and (iv) Al3Er phase formation due to Er modification. Mechanical property measurements revealed an overall enhancement under indentation, tension and compression loads. A remarkable improvement in tensile ductility (without adverse effects on strength) by +19%, +29%, and +58% was obtained in Mg-3Al-0.1Er, Mg-6Al-0.3Er and Mg-9Al-0.5Er when compared to Mg-3Al, Mg-6Al and Mg-9Al respectively. While the Mg-6Al-0.3Er alloy exhibited best ductility, the Mg-9Al-0.5Er has the best strength under both tension and compression loads. Corrosion characteristics evaluated by hydrogen evolution, salt spray and electrochemical impedance experiments revealed improved corrosion resistance of Er modified Mg-Al alloys by the enhanced purity levels and the formation of Al-Er phases.
KW - Corrosion
KW - Er modification
KW - Mechanical properties
KW - Mg-Al alloys
KW - Microstructure
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84937597755&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2015.05.284
DO - 10.1016/j.jallcom.2015.05.284
M3 - Journal articles
AN - SCOPUS:84937597755
VL - 648
SP - 759
EP - 770
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 34680
ER -