Abstract
To evaluate the potential values in heat dissipation applications, this study investigated the microstructure, mechanical and thermal properties of the Mg-0.5Ca-xZr alloys (x = 0.5 and 1 wt.%) under the as-cast, as-extruded and aged states. The phase constituents of the Mg alloys were examined by X-ray diffraction analysis, and the microstructure was inspected by optical microscopy and scanning electron microscopy. The thermal conductivity and mechanical properties of the Mg alloys were measured by the laser flash method and tensile tests, respectively. The results showed that the Mg alloys exhibited the equiaxed microstructure which is composed of α-Mg, Zr and compound Mg2Ca. Both the extrusion process and increase of Zr content remarkably enhanced the mechanical strength of the Mg alloys and deteriorated the thermal performance simultaneously. It was also found that the thermal conductivity and mechanical strength of the Mg alloys increased gradually with the increase of aging time due to the higher precipitation of Zr and compound Mg2Ca during the aging treatment. TheMg-0.5Ca-0.5Zr alloy aged at 473 K for 48 h demonstratedhigher thermal conductivity than the required values of the Mg alloys used as heat dissipation materials. Moreover, theMg-0.5Ca-0.5Zr alloy exhibited similar mechanical strength to the commonly-used Mg alloys, highlighting its potential become a potential heat dissipation material in the future due to its good combination of high thermal performance and mechanical strength.
Highlights
Academic Editors: Erdem KarakulakThe electronic, computer, communication and light-emitting diode (LED) lighting industries have grown rapidly in recent years, which raises high demand for materials that feature superior heat dissipation, high mechanical strength, low cost and light weight.Due to its desirable properties of low cost, lower density and relatively high thermal conductivity (TC) of 156 W/(m·K) at room temperature (RT) among metallic materials [1], magnesium (Mg) has attracted increasing research attention recently
TheMg-0.5Ca-0.5Zr alloy aged at 473 K for 48 h demonstratedhigher thermal conductivity than the required values of the Mg alloys used as heat dissipation materials
We investigated the microstructure, mechanical and thermal properties of the Mg-0.5Ca-xZr alloys under the as-cast, as-extruded and aged states for heat dissipation applications
Summary
The electronic, computer, communication and light-emitting diode (LED) lighting industries have grown rapidly in recent years, which raises high demand for materials that feature superior heat dissipation, high mechanical strength, low cost and light weight. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations Both high thermal performance and good mechanical strength for the heat dissipation applications. According to previous studies, increasing the alloying contents results in the decrease of TC of Mg alloys in different degrees [10,11,12,13,14,15,16,17,18,19,20,21], which may allow us to obtain Mg alloys with higher thermal property by adding only of small amount of alloying elements If those added elements can effectively strengthen the Mg alloys at the same time, it is possible to obtain Mg alloys with both higher thermal performance and good mechanical strength. The designed Mg alloys were subjected to the plastic deformation and aging treatment, and the resulting thermal and mechanical properties of Mg alloys were evaluated for potential applications in heat dissipation
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