Effect of laser surface melting on surface integrity of Ala??4.5Cu composites reinforced with SiC and MoS2

DOI：10.1016/S1003-6326(20)65217-7 期刊：Transactions of Nonferrous Metals Society of China 出版年份：2020 更新时间：2025-09-23 15:21:01

摘要： Two types of composites were prepared with Al?4.5Cu alloy as a matrix using stir casting method. One was reinforced with 10 wt.% of SiC and 2 wt.% of MoS2. The other was reinforced with 10 wt.% of SiC and 4 wt.% of MoS2. Their surfaces were remelted using a CO2 laser beam with an objective to study the influence of laser surface melting (LSM). The topography, microhardness, corrosion resistance and wear resistance of the laser melted surfaces were studied. Overall surface integrity after LSM was compared with as-cast surface. LSM enhanced the microhardness and wear resistance of the surface in each case. Porosity of the laser melted surface was low and corrosion resistance was high. Thus, LSM can be conveniently applied to enhancing the surface integrity of the aluminium composites. However, there is an optimum laser specific energy, around 38 J/m2 in this study, for obtaining the best surface integrity.

关键词： microhardness aluminium composites laser surface melting corrosion resistance molybdenum disulfide silicon carbide

作者： Praveen Kumar BANNARAVURI，Anil Kumar BIRRU，Uday Shanker DIXIT

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研究概述实验方案设备清单

研究目的

To study the influence of laser surface melting (LSM) on the surface integrity of Al?4.5Cu composites reinforced with SiC and MoS2.

研究成果

LSM refined the microstructure and eliminated porosity by forming a homogeneous melted layer. It enhanced the hardness and improved the corrosion and wear resistance of the composites. The highest hardness was noticed in the Al?4.5Cu/10SiC/4MoS2 composite after LSM at LSE of 38 J/mm2. The corrosion resistance was improved after LSM treatment due to elimination of porosity and fine grain structure. The wear resistance was also improved after LSM, with the highest wear resistance observed in the LSM-treated hybrid composites of Al?4.5Cu/10SiC/4MoS2 at LSE of 38 J/mm2.

研究不足

The study is limited to the effects of LSM on Al?4.5Cu composites reinforced with SiC and MoS2. The optimal laser specific energy for obtaining the best surface integrity was found to be around 38 J/m2, but the effects of other laser parameters were not extensively explored.

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