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| Effect of Gadolinium Addition on Microstructure and Property of AZ91 Alloy |
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Received:October 08, 2016
Revised:October 14, 2016
Accepted:October 17, 2016
Published Online:January 22, 2017
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| DOI：doi：10.3969/j.issn.1007-7545.2017.02.014 |
| KeyWord:AZ91; gadolinium; microstructure; mechanical property; corrosion property |
| Author | Institution |
| KONG Fan-xiao |
广西科技大学汽车与交通学院 |
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| Abstract: |
| Effects of microstructure, phase composition, composition of scandium in AZ91 alloy on alloy’s mechanical and corrosion properties were investigated. The results show that grain size of Mg-Gd alloy drops with increase of gadolinium content, and crystal morphology transforms from dendrite to isometric crystal with gadolinium content of about 1%~3%. Correspondingly, grain size rises with increase of gadolinium content and crystal defects increases with gadolinium content of 3% above. Dendrite crystal is observed again when gadolinium content is up to 5%. The optimum mechanical properties at room temperature and 200 ℃ are improved to 261.6 MPa and 148.7 MPa respectively when gadolinium content is increased to 3%. Corrosion current density drops markedly opon adding gadolinium, while sel-corrosion potential rises slightly. |
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