The effect of co-addition of Si, Ca and RE on microstructure and tensile properties of as-extruded AZ91 alloy

The microstructure and tensile properties of as-extruded AZ91 alloy with 1.0wt% Ca, 0.5wt% Si, 0.1wt% La and 0.1wt% Ce additions (was named AZXSE91100 alloy) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The addition of m...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-09, Vol.705, p.282-290
Main Authors: Che, Chaojie, Cai, Zhongyi, Yang, Xiaohong, Cheng, Liren, Du, Yunqiu
Format: Article
Language:English
Subjects:
Alloying elements
AZ91
CaMgSi phase
Casting alloys
Chemical elements
Discontinuous precipitation
Dislocations
Dynamic recrystallization
Electron microscopy
Elongation
Extrusion
Grain refinement
High temperature
Hot extrusion
Impact analysis
Intermetallic compounds
Magnesium compounds
Metal silicides
Microstructure
Recrystallization
Studies
Tensile properties
Tensile property
Tensile strength
Tensile stress
X-ray diffraction
Yield stress
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Summary:The microstructure and tensile properties of as-extruded AZ91 alloy with 1.0wt% Ca, 0.5wt% Si, 0.1wt% La and 0.1wt% Ce additions (was named AZXSE91100 alloy) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The addition of multiple elements results in various compounds forming in as-cast alloys. On one hand, the massive large particles are good for grain refinement of as-extruded alloy, which can promote dynamic recrystallization (DRX) during extrusion process via the mechanism of particle stimulated nucleation (PSN). On the other hand, through hot extrusion, the coarse second phases are fragmented into finer dispersed particles including lots of heat-resistant compounds, such as CaMgSi, Mg2Si, Al2RE, which play an important role in hindering dislocation motions and grain boundary sliding at elevated temperature. Accordingly, the best tensile properties at room temperature are obtained from the peak-aged as-extruded AZXSE91100 alloy, and yield stress (YS), ultimate tensile stress (UTS) and elongation (EL) are 310MPa, 370MPa and 8.9%, respectively. The best tensile properties at elevated temperature are obtained from as-extruded AZXSE91100 alloy, and YS, UTS and EL at 423K reach 222MPa, 230MPa and 25.9%, respectively.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.08.026