High temperature tensile response of nano-Al2O3 reinforced AZ31 nanocomposites

作者：Hassan S F^*; Paramsothy M; Patel F; Gupta M

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2012, 558: 278-284.

DOI：10.1016/j.msea.2012.08.002

• AZ31
• Nanocomposite
• Nano-Al2O3
• High-temperature strength
• Ductility

Nano-Al2O3 reinforcement%26apos;s capability to simultaneously enhance the room temperature (25 degrees C) strength and ductility of magnesium alloys has effectively been exploited in ingot metallurgy processed AZ31/1.5Al(2)O(3) nanocomposite in this study. Tensile characterization revealed that at high temperature (150-250 degrees C), instead of strengthening, the thermally stable nano-Al2O3 reinforcement ironically exacerbated the softening of AZ31 alloy. However, an incredible increment in AZ31 alloy (with grain size of similar to 2.3 mu m) ductility (up to 184%) has been achieved in the nanocomposite with increasing temperature due to the incorporation of nano-Al2O3 as reinforcement. Microstructural characterization of the nanocomposite revealed that the dynamic recrystallization process has induced a complete recrystallization in AZ31 alloy matrix at a relatively much lower temperature (150 degrees C) with tremendous grain growth near the fracture surface at higher temperature (250 degrees C). Fractography of the nanocomposite revealed that the room temperature mixed ductile mode fracture behavior of AZ31 alloy transformed to a complete ductile mode at high temperature due to the presence of nano-Al2O3 particulates.

• 出版日期2012-12-15
• 单位中国石油大学（北京）