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首页> 外文会议>TMS annual meeting exhibition >CORROSION AND WEAR STUDIES OF ALUMINUM ALLOY 6061-FLYASH COMPOSITES
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CORROSION AND WEAR STUDIES OF ALUMINUM ALLOY 6061-FLYASH COMPOSITES

机译：铝合金6061-粉煤灰复合材料的腐蚀与磨损研究

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The environmental degradation of Aluminium metal matrix composites have been a subject of research for the damage tolerant design requirement in aerospace and automobile components. In the past, corrosion characteristics and wear behaviour of aluminium matrix composites with SiC_p, SiCw, and AI_2O_3 as reinforcements have been extensively studied. However, owing to the high cost of these reinforcements, investigations on the usage of fly ash, available in abundance at low cost, as a reinforcement in aluminium matrix composites are being undertaken by many researchers. Also, only a few studies have been carried out on the corrosion and wear characteristics of fly ash reinforced aluminium matrix composites for aerospace applications. In the present investigation, composites with Aluminum alloy of aerospace grade AA6061 as matrix material and up to 10 wt% of fly ash paniculate were fabricated using the liquid metallurgy stir casting route. Potentiodynamic and cyclic polarization studies were carried out in 3.5% NaCI solution on AA6061 and AA6061-fly ash composites to study their corrosion behavior. Polarization results in 3.5% NaCI solution showed same corrosion potential E_(cott) value of aluminium fly ash composites as compared to base alloy. However the corrosion current density (i_(coft)) of the base alloy is lesser than that of composite indicating the higher corrosion rate of composite as compare to base alloy. The base alloy and the composites exhibited passivation followed by pitting. The pitting resistance of the composites was found to be same as that of the base alloy and there is no variation in the pitting potential with the increased in wt% of the reinforcement from 5 to 10%. The repassivation potential for the AA6061 base alloy and that of AA6061 fly ash composite did not change with the inclusion of fly ash reinforcement. The wear rate of aluminium fly ash composites is evaluated by using pin of disc machine and it is found that the wear rate of fly ash composite decreases with the increase in the reinforcement percentage from 5 to 10 %. Also the frictional force and the factional coefficient of the fly ash composite decreases with the increase in the fly ash reinforcement. The environmentally degraded and wear samples of base alloy and composites were analyzed using optical and scanning electron microscopes. The reinforcement sites were found to be preferentially pitting in the case of composites and the pits were regularly shaped as against the irregularly shaped pits in the base alloy.
机译：铝金属基复合材料的环境降解已成为航空航天和汽车零部件中耐损伤设计要求的研究主题。过去，已经广泛研究了以SiC_p，SiCw和AI_2O_3为增强材料的铝基复合材料的腐蚀特性和磨损行为。然而，由于这些增强材料的高成本，许多研究者正在对粉煤灰的使用进行研究，该粉煤灰作为铝基复合材料的增强材料以低成本大量提供。同样，关于用于航空航天的粉煤灰增强铝基复合材料的腐蚀和磨损特性仅进行了很少的研究。在本研究中，采用液态冶金搅拌铸造法制备了以航空级AA6061铝合金为基体材料和高达10 wt％的粉煤灰颗粒的复合材料。在Aa6061和Aa6061粉煤灰复合材料的3.5％NaCl溶液中进行了电位动力学和循环极化研究，以研究其腐蚀行为。在3.5％NaCl溶液中的极化结果表明，与基础合金相比，铝粉煤灰复合材料的腐蚀电位E_（cott）值相同。然而，基础合金的腐蚀电流密度（i_（coft））小于复合材料的腐蚀电流密度（i_（coft）），表明与基础合金相比，复合材料的腐蚀速率更高。基体合金和复合材料表现出钝化，随后出现点蚀。发现复合材料的耐点蚀性与基础合金相同，并且随着增强剂的wt％从5％增加到10％，点蚀电位没有变化。 AA6061基合金和AA6061粉煤灰复合材料的再钝化电位不会因添加粉煤灰增强剂而改变。用圆盘机销钉对铝粉煤灰复合材料的磨损率进行了评估，发现粉煤灰复合材料的磨损率随增强百分比的增加从5％降低到10％。而且，随着粉煤灰增强材料的增加，粉煤灰复合材料的摩擦力和摩擦系数减小。使用光学和扫描电子显微镜分析了基础合金和复合材料在环境中降解和磨损的样品。在复合材料的情况下，发现补强部位优先出现凹坑，并且凹坑的形状与基础合金中不规则形状的凹坑的形状规则。

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