Uniaxial tensile and compressive behavior of Mg/Al2O3 nanocomposite at ambient and elevated temperatures

Magnesium matrix nanocomposites exhibit a low density and high specific properties such as strength, stiffness and creep resistance. These outstanding properties enable them to be potential materials for different applications in transportation industries. In this paper, Mg/Al2O3 nanocomposite was fabricated using stir casting technology. Then, the composite was subjected to hot-extrusion process at 350℃ with a 20:1 extrusion ratio. Uniaxial tension and compression tests have been performed on the composite and pure magnesium specimens at ambient temperature and 200°C. The results demonstrated that both monolithic and composite specimens exhibit a significant decrease in the yield stress and the ultimate tensile and compressive strengths with increasing the temperature. On the other hand, ductility is improved at higher temperature. Moreover, the nanocomposite has more desirable properties comparing to the unreinforced magnesium at both temperatures. For instance, ultimate tensile strength of the nanocomposite improved 10% and 39% at ambient temperature and 200°C, respectively.

کلیدواژه ها:

Magnesium matrix nanocomposites ، Hot extrusion ، Tension ، Compression ، Elevated temperature