Aluminum alloys seemed like the alternative material of cast iron in many vehicle industries today due to light-weight and good corrosion resistance. However, aluminum alloy can quickly lose the mechanical properties and thermal physical properties, especially under elevated temperatures. By adding the composites' reinforcement material such as SiC, Al2O3, and other ceramic particles, the mechanical properties of aluminum alloy can be improved. In this work, two different Al-MMCs ( Material Matrix Composites) based on Al-Si alloys with 20wt %SiC were examed. The difference between these two Al-MMCs was the composition of Zr, in which the composition of Zr in alloy A is 0.2 %, and alloy B has 1 wt% Zr. The mechanical properties and thermal physical properties were characterized in this work. The producing method of those alloys is stirring casting, and the sample was produced by using the squeeze casting method. The compression test, dilatometry, DSC, and LFA tests were carried out at room temperature and elevated temperature. Brinell hardness test, wear test, nano-indentation, and nano scratch test, as well as microstructural investigation, were performed at Jönköping University at room temperature. All experiments were done at Jönköping University except squeeze casting, which is accomplished at AC Floby. The result shows that alloy B has better thermal conductivity and diffusivity than alloy A, which has a higher percentage of Zr. By forming a tribo-layer and with the increased strength, which is caused by the extra Zr %, the wear loss of alloy B is less than alloy A under the same conditions. The tribo-layer of alloy B can be seen more clear under SEM, and the spectrum of the tribo-layer elements for both alloys describes that alloy B formed a better tribo-layer than alloy A at the same time interval. The result of the Brinell hardness test shows that the hardness of alloy B is higher than alloy A, but the nano-indentation shows that alloy A has similar hardness as alloy B, which may be caused by the fragments of larger intermetallic phases caused during the nano-indentation test. In the compression test, at a higher strain rate under elevated temperature, there was an improvement in the ultimate stress. The material strength decreases with the increase in temperature, which may be because the intermetallic phases fade, which impedes dislocation, slide, and glide.