The elTcct of different dimension stabilization treatments on the dimension stability of SiC_(p)/Al composites were investigated by the measurement of microyield strength,microcreep properties,dimension,residual stres...The elTcct of different dimension stabilization treatments on the dimension stability of SiC_(p)/Al composites were investigated by the measurement of microyield strength,microcreep properties,dimension,residual stress and analyses of transmission electron microscopy.Results show that the heat cycle dimension stabilization techniques could efficiently decrease the residual stress,stabilize the dimension change,and increase resistance to microplastic deformation.The main reason was that the heat cycle dimension stabilization techniques might form stable dislocation structure in the SiC_(p)/A1 composites.展开更多
Si_(3)N_(4p)/2024Al composite was fabricated by squeeze casting method and treated by extrusion deformation.Microstructure analyses indicate that Si_(3)N_(4) particles in the composite are in cylindrical polyhedron sh...Si_(3)N_(4p)/2024Al composite was fabricated by squeeze casting method and treated by extrusion deformation.Microstructure analyses indicate that Si_(3)N_(4) particles in the composite are in cylindrical polyhedron shape.Extrusion deformation is beneficial to uniform distribution of Si_(3)N_(4) particles and improves the relative density of Si_(3)N_(4p)/2024Al composite.Tensile strength of Si_(3)N_(4p)/2024Al composite increases by 76.6%after T6 treatment,and after extrusion and T6 treatment it is by 57.6%more than T6 treatment only.Elastic modulus of Si_(3)N_(4p)/2024Al composite increases a little after T6 treatment but increases by 33.5%after extrusion deformation.展开更多
文摘The elTcct of different dimension stabilization treatments on the dimension stability of SiC_(p)/Al composites were investigated by the measurement of microyield strength,microcreep properties,dimension,residual stress and analyses of transmission electron microscopy.Results show that the heat cycle dimension stabilization techniques could efficiently decrease the residual stress,stabilize the dimension change,and increase resistance to microplastic deformation.The main reason was that the heat cycle dimension stabilization techniques might form stable dislocation structure in the SiC_(p)/A1 composites.
基金Project(HITQNJS.2008.057)Supported by Development Program for Outstanding Young Teachers in Harbin Institute of Technology,China。
文摘Si_(3)N_(4p)/2024Al composite was fabricated by squeeze casting method and treated by extrusion deformation.Microstructure analyses indicate that Si_(3)N_(4) particles in the composite are in cylindrical polyhedron shape.Extrusion deformation is beneficial to uniform distribution of Si_(3)N_(4) particles and improves the relative density of Si_(3)N_(4p)/2024Al composite.Tensile strength of Si_(3)N_(4p)/2024Al composite increases by 76.6%after T6 treatment,and after extrusion and T6 treatment it is by 57.6%more than T6 treatment only.Elastic modulus of Si_(3)N_(4p)/2024Al composite increases a little after T6 treatment but increases by 33.5%after extrusion deformation.
