Mechanical behaviour of Al/Al_2O_3 composite in pseudo-semi-solid state during isothermal compressio

• 作 者: 程远胜 罗守靖
• 机 构: School of Materials Science and Engineering,Harbin Institute of Technology,
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2009年S2期
• 关键词: isothermal compressive sliding slowly ascending behaviour decreasing grains rota

To gain a better understanding of thixoforging for the Al2O3-37%Al composite,its mechanical behavior in the pseudo-semi-solid state was studied by isothermal compression tests.The results show that the values of peak stress obviously decrease with increasing temperature and decreasing strain rate.The compressive true stress-strain curves of the Al2O3-37%Al composite can be divided into four stages.They are rapidly ascending,decreasing,steady and slowly ascending.Moreover,the main deformation mechanism controlling deformation of the composite in the pseudo-semi-solid state is the sliding or rotary movement between solid particles.

To gain a better understanding of thixoforging for the Al2O3-37% Al composite, its mechanical behavior in the pseudo-semi-solid state was studied by isothermal compression tests. Results show that the values ​​of peak stress obviously decrease with increasing temperature and decreasing strain rate.The compressive true stress-strain curves of the Al2O3-37% Al composite can be divided into four stages.They are rapidly ascending, decreasing, steady and slowly ascending. Moreover, the main deformation mechanism controlling deformation of the composite in the pseudo-semi-solid state is the sliding or rotary movement between solid particles.