Özkaya Serdar
Faculty of Engineering, Metallurgical and Materials Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey.
Materials (Basel). 2024 Dec 20;17(24):6246. doi: 10.3390/ma17246246.
The objective of this study is to develop chromium-reinforced metal-metal composites utilizing an AA5083 aluminum alloy matrix through powder metallurgy while also examining their properties. Samples were produced by incorporating varying quantities of chromium (5%, 10%, and 15% by weight) into the AA5083 matrix. In order to ensure a uniform distribution of chromium particles, the powders were blended in a ball mill and subsequently hot-pressed at 500 °C under 500 MPa for a period of two hours in an argon atmosphere. The resulting samples were subjected to analysis in order to determine the effect of chromium content on the composites, with particular attention being paid to their microstructure, hardness, density, tensile properties, tribological performance and corrosion resistance. The findings demonstrated that an elevated chromium concentration markedly augmented the hardness of the composite, exhibiting a 50% enhancement in the 15 wt.% Cr composite. A 30% reduction in wear loss was observed for the same sample. The A10 sample (10 wt.% Cr) exhibited the greatest corrosion resistance, although this declined in the A15 sample due to increased porosity. Tensile strength increased by up to 10 wt.% Cr before decreasing at 15 wt.% Cr, which was also attributed to porosity. These findings demonstrate that chromium reinforcement enhances the mechanical and tribological performance of AA5083 composites, rendering them suitable for applications requiring high hardness and wear resistance.
本研究的目的是通过粉末冶金开发以AA5083铝合金为基体的铬增强金属-金属复合材料，同时研究其性能。通过将不同数量的铬（重量百分比分别为5%、10%和15%）加入到AA5083基体中来制备样品。为确保铬颗粒均匀分布，将粉末在球磨机中混合，随后在氩气气氛中于500℃、500MPa下热压两小时。对所得样品进行分析，以确定铬含量对复合材料的影响，尤其关注其微观结构、硬度、密度、拉伸性能、摩擦学性能和耐腐蚀性。研究结果表明，较高的铬浓度显著提高了复合材料的硬度，在含15wt.%铬的复合材料中硬度提高了50%。同一样品的磨损损失降低了30%。A10样品（含10wt.%铬）表现出最大的耐腐蚀性，不过由于孔隙率增加，A15样品的耐腐蚀性有所下降。拉伸强度在含铬量达到10wt.%之前有所提高，在15wt.%时下降，这也归因于孔隙率。这些研究结果表明，铬增强提高了AA5083复合材料的力学性能和摩擦学性能，使其适用于需要高硬度和耐磨性的应用。
