Analysis of hot deformation behavior and microstructure evolution of as-cast SiC nanoparticles reinforced magnesium matrix composite

作者：Wang, Ting; Nie, Kai-bo^*; Deng, Kun-kun; Liang, Wei

来源：Journal of Materials Research, 2016, 31(21): 3437-3447.

DOI：10.1557/jmr.2016.362

• magnesium matrix nanocomposite
• processing map
• constructive equation
• activation energy

The hot deformation behavior of as-cast AZ91 magnesium alloy reinforced by SiC nanoparticles (SiCp/AZ91 nanocomposite) was investigated using hot compression test. Compared with unreinforced AZ91 alloy, peak stress of the SiCp/AZ91 nanocomposite achieved faster and high temperature deformation ability which was enhanced by the addition of SiC nanoparticles. The values of n for the AZ91 alloy and nanocomposite were 6.9 and 4.6, while the values of Q were 207.96 kJ/mol and 184.6 kJ/mol, respectively. The processing map showed the optimum processing conditions for the nanocomposite mainly concentrated at 523-673 K/0.018-0.001 s(-1) and the maximum power dissipation efficiency was found to be 36% at a temperature of 673 K and the strain rate of 0.001 s(-1). Based on the constitutive equation and processing map, the deformation mechanism for the present nanocomposite should be dominated by the mechanism of dynamic recrystalization.

• 出版日期2016-11
• 单位太原理工大学