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The Si_3N_4 whisker reinforced 6061Al composite with bending strength of 790 MPa wasprepared by squeeze casting process.After heat-treatment under T6 regime i.e.530℃,1 h solutioning and 160℃,24 h aging,an increment in strength and microhardnessmay be over 20% and 28% respectively,The microstructures of Si_3N_4 whisker andSi_3N_4/Al interface were observed by meas of HRTEM.The relation between interracialstructure and composite properties was discussed.
The Si_3N_4 whisker reinforced 6061Al composite with bending strength of 790 MPa wasprepared by squeeze casting process. After heat-treatment under T6 regime ie530 ° C for 1 h solutioning and 160 ° C for 24 h aging, an increment in strength and microhardness may be over 20% and 28% respectively, The microstructures of Si_3N_4 whisker and Si_3N_4 / Al interface were observed by meas of HRTEM. The relation between interracial structure and composite properties was discussed.