Journal Article

PUBDB-2025-05346

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Temperature-dependent thermal conductivity and microscopic mechanisms in a Mg-Al-Y alloy

Zhang, L. ; Wang, J. (Corresponding author)Extern* ; Wu, L. ; Zhao, Y. (Corresponding author) ; Liu, Y. ; Huang, M.Extern* ; Chen, Z. ; Zhu, G. (Corresponding author)Extern* ; Zeng, X.

2025
[Verlag nicht ermittelbar] Beijing

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Please use a persistent id in citations: doi:10.1016/j.jre.2025.08.014

Abstract: Products designed for heat dissipation are often operated in elevated temperature environments. Therefore, understanding the microstructural variations, affected by heat treating processes, on thermal behavior at elevated temperatures is essential for the advancement of heat dissipation applications. Nevertheless, the temperature effect on thermal conductivity of magnesium alloys with different microstructures remains unclear. This study introduces an “intermetallic + α-Mg” two-phase model to clarify these effects in a Mg-7.28Al-0.13Y-0.11Mn (AW70) alloy. The thermal conductivity of as-solutionized AW70 alloy is 55.1 W/(m·K) at ambient temperature, and increases to 68.2 W/(m·K) after aging, due to precipitation that reduces lattice distortion. As temperature rises, the thermal conductivity, in both solutionized and aged states, generally increases owing to consistent electron scattering by static lattice defects. The thermal conductivity of solutionized and aged AW70 alloy at 250 °C is about 79.2 and 91.2 W/(m·K) respectively, reflecting increase of 24.8 W/(m·K) (45.6%) and 22.2 W/(m·K) (32.3%) compared to the values measured at 25 °C. Both the solutionized and aged alloys exhibit a stable thermal conductivity increase rate (0.11 W/(m·K2)) below 250 °C, demonstrating a remarkable independence from variations in solute content and precipitates. Within the temperature range of 250–350 °C, the as-aged alloy shows a temporary decline in thermal conductivity, attributed to the dissolution of the Mg17Al12 precipitates into the α-Mg matrix. This research fills a gap in current understanding, while also sets the stage for further explorations in manipulating thermal properties of Mg alloys.

Note: OnlineFirst VDB

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P21.2 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
Clarivate Analytics Master Journal List ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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