Effect of Ca and Rare Earths on Compressive Creep Behavior of Mg-4Al Alloy

The effect of Ca and rare earths on compressive creep behavior of Mg-4Al alloy was investigated with a special apparatus. The microstructures were analyzed by OM, XRD, SEM and EDS before and after compressive creep test. The results reveal that a small amount of Ca was added into AE41 alloy in order...

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Bibliographic Details
Published inApplied Mechanics and Materials Vol. 190-191; pp. 457 - 461
Main Authors Du, Chun Ping, Xu, Dao Fen, Wang, Bin Wu
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.07.2012
Subjects
Compressive Creep
AE41 Alloy
Creep Resistance
Rare Earth (RE)
CA
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Summary:The effect of Ca and rare earths on compressive creep behavior of Mg-4Al alloy was investigated with a special apparatus. The microstructures were analyzed by OM, XRD, SEM and EDS before and after compressive creep test. The results reveal that a small amount of Ca was added into AE41 alloy in order to refine the crystalline structure and improve the creep resistance. Comparing with NdPr rare earths alloy, the creep resistance of LPC rare earths alloy decreases, but is still better than AE41 alloy. The as-cast microstructure of AE41 alloy is mainly composed of α-Mg matrix and Al11Nd3 phase. The acicular Al11Nd3 phase is prone to decompose at high temperature, which leads to the poor creep resistance of AE41 alloy. The acicular Al11RE3 phase is gradually replaced by Al2Ca and Al2RE with Ca addition into AE41. LPC rare-earth mixture is in cluster at grain boundaries so that the creep resistance is worse than that of alloy containing NdPr rare-earth mixture.
Bibliography:Selected, peer reviewed papers from the 3nd International Conference on Digital Manufacturing & Automation (ICDMA 2012), August 1-2, 2012, Guangxi, China
ISBN:9783037854624
3037854626
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/www.scientific.net/AMM.190-191.457