Estimation of microstructural plastic property of die-cast Mg alloy (AZ91D) with an elevated temperature indentation

Fujisawa, Shoichi; Yonezu, Akio; Okamura, Takeo; Yoneda, Koji

doi:10.1016/j.msea.2014.07.106

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…Magnesium and its alloys have attracted considerable attention due to the superior properties, such as low density, high specific strength and stiffness [1,2]. However, magnesium alloys exhibit poor creep resistance and low strength at elevated temperature limiting the application of magnesium alloys as structural materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

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

Liu

et al. 2017

MSF

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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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