Microstructure And Wear Mechanism Of The Al-Mn Alloy And Its Composite Material In Different Sliding Friction State

In order to development the water-saving irrigation, Al-Mn alloy and Al₂O₃particlereinforced Al-Mn-based composite materials as the research content to be fabricated bystirring casting, by analyzing their mechanical properties to reach the low-cost, long life andhave good resistances in corrosion and wear to the result.Their microstructures, strengthening mechanism and impact toughness were investigated.And also research their wear behavior in dry and wet friction in. The results show that:（1）The as-cast microstructure of Al-Mn alloy is composed of α-Al matrix with Al₁₁Mn₄andMnAl₆compounds; The as-cast microstructure of Al₂O₃particle reinforced Al-Mn-basedcomposite materials is composed of α-Al matrix with δ—Al₂O₃, Al₁₁Mn₄and MnAl₆compounds.（2） The hardness of Al-Mn alloy is strengthening by manganese, and thehardness of Al-Mn-based composite materials is strengthening by Al₂O₃particle andmanganese.（3） With the increase of manganese, the impact fractures of Al-Mn alloy and Al-Mn-based composite materials from plastic morphology to quasi-cleavage morphology.（4） Insame condition, the worn mass losses with the load increasing are increasing. The worn masslosses of Al-Mn-based composite materials are lower than The worn mass losses of Al-Mnalloy, when the percents of manganese are similar. And the worn mass losses of both Al-Mnalloy and Al-Mn-based composite materials under lubricating condition are greater than thatunder dry condition, because combination of corrosion and mechanical wear in wet frictioncondition generates furrows and corroded pits on sample surface, while adhesive wear in dryfriction condition makes worn chips flake off the sample surface.（5）In the same condition,most of the friction coefficients of wet condition are higher than the friction coefficients ofdry condition.In all, the Al₂O₃particle reinforced Al-Mn-based composite materials have better wearresistances than Al-Mn alloy.