通过搅拌铸造开发原位铝化镍增强铝硅基复合材料并确定其特性

A. Saiyathibrahim, V. Jatti, P. Dhanapal, D. Mohan
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引用次数: 0

摘要

铝基复合材料(AMC)具有航空和汽车工业所需的良好机械性能。在当前的研究中,A413(共晶铝Si)合金被用作基体材料,镍基试卤化物(Al3Ni)和原生硅颗粒被用作增强材料,通过搅拌铸造工艺制造铝基复合材料。共使用了三种含镍量分别为 3、6 和 9 wt% 的复合合金来制造搅拌铸造复合材料,并对其微观结构特征以及拉伸强度、冲击强度和硬度等机械性能进行了评估。此外,还研究了三种不同施加载荷(10、20 和 30 N)下的干滑动磨损行为。扫描电子显微镜(SEM)显示了 Al3Ni 镍试铝化物的成核和原生硅相的增加,并显示了这种增强材料在 α-Al 中的均匀分布。镍含量最高(9 wt%)的复合材料的微观结构由 31 Vol% 的原位 Al3Ni 金属间化合物和 8.1 Vol% 的原生硅颗粒组成。这种复合材料的硬度和拉伸强度分别提高了 25.93% 和 40.30%。与 A413 合金相比,原位增强复合材料的质量指数值更高,A413 合金的质量指数值最低,为 248.83 兆帕,下降了 9.91%。与 A413 铝合金相比,复合材料的冲击强度最大降低了 50%,延展性也显著降低。耐磨性随着基体内部原位增强材料的增加而提高,而外加载荷的增加则导致磨损率升高。铝基体与原位增强材料(镍钛铝化物和原生硅)之间的均匀分散和良好的界面结合显示出卓越的机械性能,可作为一种新型复合材料用于工业应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development and characterization of in‐situ nickel aluminide reinforced Al‐Si matrix composites by stir casting
Aluminium matrix composites (AMCs) exhibit promising mechanical properties that are required for the aeronautical and automotive industries. In the current research, A413 (eutectic AlSi) alloy is employed as matrix material, and nickel based trialuminide (Al3Ni) with primary Si particles as reinforcements to manufacture aluminium matrix composites through the stir casting process. A total of three varieties of composite alloys containing 3, 6, and 9 wt% of nickel were used to fabricate stir cast composites, and their microstructural features, along with mechanical properties, such as tensile strength, impact strength, and hardness, were evaluated. Furthermore, the dry sliding wear behavior for three different applied loads (10, 20, and 30 N) was studied. Scanning electron microscopy (SEM) revealed nucleation of Al3Ni nickel trialuminide and increase of primary Si phases as well as exhibited even dissemination of such reinforcements in α‐Al. The composite with the highest nickel content (9 wt%) had a microstructure that consisted of 31 vol% in‐situ Al3Ni intermetallic and 8.1 vol% primary Si particles. This composite demonstrated a maximum increase of 25.93% in hardness and 40.30% in tensile strength. The quality index values of composites with in‐situ reinforcements were higher compared to that of A413 alloy, which had the lowest quality index value of 248.83 MPa, representing a 9.91% decrease. The impact strength of the composite was found to be reduced by a maximum of 50% and showed a significant loss in ductility also when compared with A413 aluminium alloy. Wear resistance was found to be increased with the evolution of in‐situ reinforcements inside the matrix, whereas an increase in applied load resulted in a higher wear rate. The uniform dispersion and good interfacial bonding between the aluminium matrix and in‐situ reinforcements (nickel trialuminide and primary Si) are showing preeminent mechanical properties and can be a novel composite material for industrial applications.
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