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

Jian Rong, J. Zhu, Wenlong Xiao*, Xinqing Zhao, Chaoli Ma

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Article number107350
Number of pages8
JournalIntermetallics
Volume139
DOIs
Publication statusPublished - 2021

Bibliographical note

Accepted Author Manuscript

Keywords

  • High pressure die casting
  • Magnesium alloys
  • Mechanical properties
  • Microstructure
  • Thermal conductivity

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