A Study on Microstructures and Creep Behaviors in the Mg-3Sr-xY Alloys

Ming Hu; Han Fei; Jing Gao; Fang Fang Zhao

doi:10.4028/www.scientific.net/AMR.418-420.602

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 418-420A Study on Microstructures and Creep Behaviors in...

A Study on Microstructures and Creep Behaviors in the Mg-3Sr-xY Alloys

Abstract:

In this paper, the author successfully fabricated Mg-3Sr-xY alloys by melting-leaching reduction method using SF₆ and N₂ as protected gas. The microstructures of the Mg-3Sr-xY alloys were investigated in details，and the results showed that Mg-3Sr-xY alloys are composed of dendrite α-Mg and eutectic α-Mg and Mg₁₇Sr₂ and Mg₂₄Y₅ particulates, the second phases distribute in the α-Mg dendrites and interdendrites. The fiber microstructures form after thermal extrusion and the dynamic recrystallization occurs. In Mg-3Sr-xY alloy, the tensile strengths, the yield strengths and elongation rates increase firstly, reach the peak values, decrease with the increasing in Y content. Mg-3Sr-xY alloy have the best mechanics properties, including yield strengths and ultimate strengths and elongation rates and creep properties by the addition of 0.6%Y content. The tensile behaviors at elevated temperatures are accord to general laws for the metals at room temperature. The Mg-3Sr-xY alloys with 0.4-1.0% Y are of best creep limit. The dislocation sliding and climbing is the main creep mechanism for Mg-3Sr-0.6Y alloys.

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Materials Processing Technology, ICAMMP2011

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Periodical:

Advanced Materials Research (Volumes 418-420)

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602-605

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.418-420.602

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Online since:

December 2011

Authors:

Ming Hu, Han Fei, Jing Gao, Fang Fang Zhao

Keywords:

Creep, Mechanical Property, Mg-Sr-Y, Microstructure

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