Microstructure and Creep Behaviors of As-Cast Mg-Zn-Er Alloys

Rui Jing Li; Shu Bo Li; Ke Liu; Zhao Hui Wang; Xian Du; Wen Bo Du

doi:10.4028/www.scientific.net/MSF.898.305

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HomeMaterials Science ForumMaterials Science Forum Vol. 898Microstructure and Creep Behaviors of As-Cast...

Microstructure and Creep Behaviors of As-Cast Mg-Zn-Er Alloys

Abstract:

The microstructure and creep behaviors of cast Mg-xZn-yEr (x=3,6,9 wt.%, x/y=6) alloys were investigated by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). XRD results indicated that the main phase compositions of as-cast Mg-xZn-yEr alloys were the icosahedral quasicrystalline phase (I-phase) and α-Mg solid solution. The I-phase mainly distributed in the dendritic and staccato strips. The creep tests were conducted under the condition of 448 K, 70 MPa for 100 h. As the addition of Er increased from 0.5 wt.% to 1.5 wt.%, the total creep strain decreased from 0.962% to 0.512%, and the steady state creep rate decreased from 1.411×10^-⁸s^-1 to 4.917×10^-9s^-1. The I-phase had a tendency to be bulky and continuous, as the volume fraction of Er element increased. Ascribed to the I-phase, the creep strain happened and effectively blocked the movement of dislocations, resulting in the strengthened as-cast Mg-Zn-Er alloys and improved creep resistance. Based on the investigation of creep behaviors, the creep mechanism of the as-cast alloy was mainly grain boundary slipping.

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Materials Science Forum (Volume 898)

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305-310

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https://doi.org/10.4028/www.scientific.net/MSF.898.305

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June 2017

Authors:

Rui Jing Li, Shu Bo Li*, Ke Liu, Zhao Hui Wang, Xian Du, Wen Bo Du

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Creep Resistance, I-Phase, Mg-Zn-Er Alloy, Microstructure

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