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TRIBOLOGICAL BEHAVIOR OF A319- Al_2O_3 OR C PARTICULATE COMPOSITES FABRICATED BY STIR AND SQUEEZE CASTING METHODS

机译:搅拌和挤压铸造方法制造的A319-AL_2O_3或C颗粒复合材料的摩擦学行为

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The wear behavior of aluminum alloys has received substantial attention. In dry sliding, ductile materials such as aluminum alloys usually experience severe wear [1-5], which involves substantial surface plastic deformation at the surface. Metal-matrix composites (MMCs) have been received substantial attention from the aerospace and automotive industries because of their improved strength, high elastic modulus and increased wear resistance over conventional monolithic base alloys during the last decade. Improvements in mechanical properties and wear resistance of MMCs have already been demonstrated for a variety of reinforcements [6-14]. A319 alloy is used in transportation vehicle components in which tribological properties are important. It is well known that the wear resistance of Al-Si alloys is influenced by factors such as load and speed as well as microstructural parameters such as the morphology and volume faction of the silicon phase [15-19].A significant improvement in the adhesive wear resistance of Al-Si alloys reinforced with 5 wt. % Al_2O_3 particles was reported by Surappa et al. [20]. Similarly, Pramila et al. [21] noted a decrease in wear rate with increasing of SiC particle content from 15 to 20 wt.% in Al-Si alloy using a pin-on-disc apparatus[6,7]. Generally, it was found that the wear resistance of the composites was considerably higher than that of the aluminum alloy and increased with increasing Al_2O_3 particulates content and size. The majority of the wear behavior of aluminum studies has been undertaken using ferrous counterfaces. It is well known that there are strong adhesive interactions between the aluminum and ferrous materials, as shown by the substantial mechanically mixed layer that is developed in the surface of the aluminum alloy [11,12]. The effect of 2 wt. % graphite particulate addition into Al alloy on the wear rate has been studied by Gibson et al. [22]. They have found that the wear rate of the composite material is significantly reduced by the addition of 2 wt.% graphit particulates. However, with increasing the amount of graphite content to 8 wt.%, the wear rate increases due to the low strength at the interface between graphite particulates and Al alloy. Also, because of the presence of porosity at the interface, the graphite particulates easily fracture and spall along the sliding direction with voids left on the friction surface [23-25]. It was observed that the tribological behavior of the composites in the T6 heat-treated condition is better than in the annealed condition or the unreinforced alloy. Also, it was found that AA6061-SiC MMCs showed a significant improvement in wear resistance over monolithic AA6061 alloy [26-28]. In the present study, the effect of additions of different contents of Al_2O_3 or C particulates into A319 alloy prepared by squeeze casting on the wear and friction behavior under different loads was investigated.
机译:铝合金的磨损行为受到了重大关注。在干滑动中,铝合金如延性材料通常经历严重的磨损[1-5],这涉及表面上的大量表面塑性变形。金属基质复合材料(MMCS)已得到航空航天和汽车行业的大量关注,因为它们在过去十年中提高了常规整体基础合金的强度,高弹性模量和增加的耐磨性。已经证明了MMC的机械性能和耐磨性的改善,用于各种增强材料[6-14]。 A319合金用于运输车辆组分,其中摩擦学特性很重要。众所周知,Al-Si合金的耐磨性受到诸如负荷和速度的因素的因素以及硅阶段的形态和体积派的微观结构参数[15-19]。粘合剂的显着改善用5wt加固的Al-Si合金的耐磨性。由Surappa等人报告%Al_2O_3颗粒。 [20]。同样,Pramila等。 [21]注意到使用引脚盘装置的Al-Si合金的SiC颗粒含量从15至20重量%增加,磨损率降低[6,7]。通常,发现复合材料的耐磨性远高于铝合金的耐磨性,随着Al_2O_3颗粒含量和尺寸的增加而增加。铝研究的大部分磨损行为使用了黑色反复件进行。众所周知,铝和亚铁材料之间存在强的粘合剂相互作用,如在铝合金表面上显影的基本机械混合层所示[11,12]所示。 2重量%的效果。 Gibson等人研究了磨损率的Al合金中的%石墨颗粒。 [22]。他们发现,通过加入2重量%,复合材料的磨损率显着降低。%石墨颗粒。然而,随着石墨含量的量增加至8重量%。%,由于石墨颗粒和Al合金之间的界面处的低强度,磨损率增加。而且,由于界面处存在孔隙率,石墨颗粒容易沿着滑动方向沿着摩擦表面留下的空隙来突破和剥落[23-25]。观察到,T6热处理条件中复合材料的摩擦学行为优于退火条件或未合金的合金。此外,发现AA6061-SiC MMC在整体式AA6061合金上显示出耐磨性的显着改善[26-28]。在本研究中,研究了在不同载荷下,研究了通过挤压和摩擦行为对通过挤压和摩擦行为制备的A319合金的不同含量的效果。

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