Date of Award


Publication Type


Degree Name



Mechanical, Automotive, and Materials Engineering


Al-0.3Mn;As-cast;Electrical Conductivities;Mechanical Properties;Microstructure


Henry Hu



Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Al-0.3Mn was prepared by permanent steel mold casting (PMSC) with three different section thicknesses of 6, 10, 20 mm, and also by squeeze casting (SC) with a cross-sectional thickness of 20 mm under an applied pressure of 90 MPa. The first group of samples was employed to investigate the difference in mechanical and electrical properties between the PSMC Al-0.3Mn Alloy and high-purity (HP) Al (99.9%). The results of tensile testing indicated that the ultimate tensile strength (UTS), yield strength (YS) of the cast HP Al significantly increased to 72.3 and 20.4 MPa from 59.2 and 14.0 MPa. However, the elongation (ef ) and electrical conductivity of the cast alloy decreased to 28.9% and 45.6 %IACS from 37.1% and 61.1 %IACS. The large area fraction (2.1%) of the micron Al-Fe-Mn and nano Al-Mn phases in the PSMC Al-0.3%Mn alloy should be responsible for the difference in mechanical and electrical properties between the PSMC Al-0.3Mn alloy and the PSMC HP Al. The second group of samples was used to study the effect of section thicknesses on microstructure, mechanical and electrical properties of the PSMC Al-0.3Mn alloy. The UTS, YS, ef, and elastic modulus (E) of the alloy increased, when the section thickness of the PSMC Al-0.3Mn decreased to 6 mm from 20 mm. However, the porosity level increased to 1.25% from 2.58% with increasing the thickness to 20 mm from 6 mm, respectively. The fine microstructure and low porosity level resulted in the high mechanical properties and electrical conductivities of the 6 mm sample