A high pressure die cast magnesium alloy with superior thermal conductivity and high strength

Rong, Jian; Zhu, Jia-Ning; Xiao, Wenlong; Zhao, Xinqing; Ma, Chaoli

doi:10.1016/j.intermet.2021.107350

A high pressure die cast magnesium alloy with superior thermal conductivity and high strength

Title

A high pressure die cast magnesium alloy with superior thermal conductivity and high strength

Author

Rong, Jian (Beihang University)
Zhu, Jia-Ning (TU Delft Team Vera Popovich)
Xiao, Wenlong (Beihang University)
Zhao, Xinqing (Beihang University)
Ma, Chaoli (Beihang University)

Date

2021

Abstract

Thermal conductivity is a key parameter for high performance material needed for electronic devices. While most commercially used Mg foundry alloys exhibit low thermal conductivities. In this work, we developed an Mg–3RE–0.5Zn alloy that is suitable for high pressure die cast (HPDC) ultrathin wall cellphone components. The thermal conductivity of this alloy was measured to be 133.9 W/(m·K) at room temperature, approximately 85% that of pure Mg (156 W/(m·K)). Meanwhile, it exhibited acceptable room-temperature mechanical properties with high yield strength of ∼153 MPa, ultimate tensile strength of ∼195 MPa, and elongation of ∼4.3%. The excellent combination of superior thermal conductivity and high strength is attributed to low solute atoms in the α-Mg matrix and the formation of networked (Mg, Zn)₁₂RE eutectic phase. The results from this study will be helpful for developing new HPDC Mg alloys with more excellent performances and promoting the wider application of Mg alloys.

Subject

High pressure die casting
Magnesium alloys
Mechanical properties
Microstructure
Thermal conductivity

To reference this document use:

http://resolver.tudelft.nl/uuid:bf8763a2-2d22-48e0-8a55-68104675d240

DOI

https://doi.org/10.1016/j.intermet.2021.107350

Embargo date

2023-09-11

ISSN

0966-9795

Source

Intermetallics, 139