Abstract
As-cast and as-extruded Mg-[x]Zn-0.3Mn (x=1.5, 2.0 wt.%) alloys were prepared by means of medium-frequency induction-heating technique and extrusion process, respectively. The microstructural characteristics, thermal conductivity and mechanical properties of the samples were characterized. The research results show that the samples are composed of major α-Mg and minor second phases MgZn2. For the as-extruded samples, the grain size is refined. After extrusion, much more second phases were precipitated from α-Mg matrix and the dislocations were reduced. The degree of lattice distortion was decreased for as-extruded samples. Because of the decline of lattice distortion degree, the as-extruded samples display much higher thermal conductivity than the as-cast samples. Additionally, on account of lower lattice distortion, Mg-1.5Zn-0.3Mn alloy has a bit larger thermal conductivity than Mg-2Zn-0.3Mn alloy. Finally, the as-extruded alloys present good mechanical properties based on the fine-grained strengthening and second-phase strengthening mechanism.
Highlights
Magnesium alloys have attracted more and more attention due to their excellent application properties which include high specific strength for light structural materials and proper thermal conductivity[1,2,3,4,5,6]
Much more second phases precipitated from α-Mg matrix
The content of the solute atoms such as Zn would decrease in α-Mg matrix, which resulted in the declined lattice distortion degree for the as-extruded samples
Summary
Magnesium alloys have attracted more and more attention due to their excellent application properties which include high specific strength for light structural materials and proper thermal conductivity[1,2,3,4,5,6]. Pan et al reported the thermal conductivity of Mg-Zn alloys at room temperature Their results showed that thermal conductivity decreased with the increasing content of Zn. The additive amount of Zn for moderate thermal conductance should be around 2 wt.% 10. The additive amount of Zn for moderate thermal conductance should be around 2 wt.% 10 Other element such as Mn could play an important role in improving the properties of Mg alloys. From the application point of view, besides good thermal conductivity, the mechanical properties of magnesium alloys are very important. The properties of magnesium alloys are related to their microstructural characteristics including dislocations, grain boundaries and second phases, which are strongly affected by the addition of alloy elements and deformational processing. Their microstructure, thermal conductivity and mechanical properties were characterized. The correlation between thermal conductivity, mechanical properties and microstructure was discussed to reveal the mechanism of high thermal conductivity and mechanical properties for the as-extruded samples
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