Effect of plastic deformation on microstructure and hardness of AlSi/Al gradient composites
The effects of plastic deformation on the evolution of microstructure and micro-hardness were studied on plates made from a cylindrical ingot of AlSi/Al aluminum composite.This ingot was produced by double-stream-pouring continuous casting(DSPCC).The results show that the three layers,i.e.the external pure aluminum,internal Al-Si alloy and the transition gradient layer,are maintained after compression as well as rolling processing.With the decrease in thickness of the gradient composite plate,the fluctuation of micro-hardness in transition layer in the direction normal to the applied force is significantly reduced.A simplified lamination model was used to evaluate qualitatively the micro-hardness distribution in the direction parallel to the applied force.However,the model is invalid in the explanation of the fluctuation of the micro-hardness in the direction normal to the applied force.The micro-hardness distribution variation in this direction is mainly attributed to the deformation of α(Al) matrix incorporated the dissolution and spheroidization of eutectic silicon phase.
continuous casting plastic deformation gradient composites microstructure hardness
ZHANG Wei-wen LUO Zong-qiang XIA Wei LI Yuan-yuan
School of Mechanical Engineering,South China University of Technology,Guangzhou 510640,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）