STATISTICAL RESEARCH ON EFFECT OF HEAT-TREATMENT ON DRY SLIDING FRICTION AND WEAR PROPERTIES OF Al₂O_3f+C_f/ZL109 HYBRID COMPOSITE

An Al₂O_3f+C_f/ZL109 short fibers reinforced hybrid metal matrix composite was fabricated by squeeze casting.By means of the statistical research method,the effects of heat-treatment on the dry sliding friction and wear properties of the hybrid composites were investigated under the condition of 196 N load and velocity of 0.837 m/s.The results show that the wear rate and friction coefficient of both as cast and as heat-treated hybrid composite accord with normal distribution of probability density.The normal distribution functions of the wear rate and friction coefficient are of identical variance,but the average values of the wear rate and friction coefficient of as cast hybrid composite are greater than those of as heat-treated hybrid composite.Heat-treatment is beneficial to improving the dry sliding friction and wear property of the composite.The dominant wear mechanism of as cast hybrid composite is plough and delamination.Heat-treatment can improve the resistivity of delamination of composite.The dominant wear mechanism of as heat-treated hybrid composite is slight plough.