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| Effect of Yttrium on Microstructure and Property of AZ91 Magnesium Alloy |
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Received:March 23, 2012
Revised:March 23, 2012
Accepted:March 23, 2012
Published Online:September 19, 2012
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| DOI：10.3969/j.issn.1007-7545.2012.10.015 |
| KeyWord:AZ91 magnesium alloy; yttrium; microstructure; mechanical property; corrosion property |
| Author | Institution |
| KONG Fan-xiao |
广西工学院职业技术教育学院 |
| YAO Su-juan |
河南神火集团有限公司，中国铝业股份有限公司 |
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| Abstract: |
| The effects of yttrium on the microstructure, mechanical property and corrosion property of AZ91 were studied, the phase composition and microstructure of yttrium in the alloy was also investigated. The results show that yttrium generates Al4MgY phase in AZ91 alloy and refines the crystal grain by heterogeneous nucleation and reducing the secondary dendritic crystal distance. The surface of alloy changes from severe corrosion to uniform corrosion with slight pitting corrosion after adding yttrium. The optimum mechanical property at room temperature and 200 ℃ are improved to 264.8 MPa, 164.8 MPa respectively when the content of yttrium is increased to 1.25%. |
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