Effects of La Addition on the Microstructure, Thermal Conductivity and Mechanical Properties of Mg-3Al-0.3Mn Alloys

The effects of La addition on the microstructure, thermal conductivity and mechanical properties of as-cast and as-extruded Mg-3Al-xLa-0.3Mn (x = 1, 3 and 5 wt.%) alloys were studied. The results showed that the thermal conductivity of the alloys increased with the addition of La element, which was...

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Published inMaterials Vol. 15; no. 3; p. 1078
Main Authors Liu, Huafeng, Zuo, Jing, Nakata, Taiki, Xu, Chao, Wang, Guisong, Shi, Hailong, Tang, Guangze, Wang, Xiaojun, Kamado, Shigeharu, Geng, Lin
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 29.01.2022
MDPI
Subjects
Alloys
Anisotropy
Crystal defects
Elongation
Grain boundaries
Heat conductivity
Heat transfer
Hot extrusion
Intermetallic compounds
Magnesium base alloys
Mechanical properties
Mg-Al-La-Mn alloys
Microstructure
Scanning electron microscopy
Solids
Strengthening
Temperature
Tensile strength
Texture
Thermal conductivity
Yield strength
United States > US
microstructure
thermal conductivity
Mg-Al-La-Mn alloys
texture
mechanical properties
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Summary:The effects of La addition on the microstructure, thermal conductivity and mechanical properties of as-cast and as-extruded Mg-3Al-xLa-0.3Mn (x = 1, 3 and 5 wt.%) alloys were studied. The results showed that the thermal conductivity of the alloys increased with the addition of La element, which was due to the formation of the Al La phases by consuming the solute Al and the added La element. The yield strength of the as-cast Mg-3Al-xLa-0.3Mn alloys increased with the increase in La concentration. The thermal conductivity of the as-extruded alloys was lower than that of as-cast counterparts owing to lots of defects generated in the process of hot extrusion deformation, particularly the grain boundaries. The anisotropy of thermal conductivity was discovered in the as-extruded alloys on account of the formation of texture. As the La content increases, the tensile strength and yield strength of the as-extruded alloys decreased gradually. In contrast, the elongation first increased and then decreased, resulting from the combined effect of the texture strengthening and second phase strengthening.
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These authors contribute equally to the paper.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15031078