Investigation on Surface Integrity of Rapidly Solidified Aluminum RSA 905 by Magnetic Field-Assisted Finishing
Guo, Jiang WANG HAO Goh, Min Hao Liu, Kui
Guo, Jiang
Goh, Min Hao
Liu, Kui
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Abstract
RSA 905, a rapidly solidified aluminum alloy, has been widely utilized in optical, automotive, and aerospace industries owing to its superior mechanical properties such as hardness and strength compared to conventional aluminum alloys. However, the surface finishing of RSA 905 to achieve submicron surface roughness is quite challenging and was rarely addressed. This paper presents an experimental and analytical study on magnetic field-assisted finishing (MFAF) of RSA 905 through a systematic investigation on surface integrity in relation to the MFAF process parameters. The effect of abrasive and polishing speed conditions on material removal and surface roughness was quantitatively investigated. The surface and subsurface quality were evaluated by optical microscope and scanning electron microscope (SEM) observations, residual stress measurement, surface microhardness and tribology test. The results show that relatively high material removal and low surface roughness were obtained under conditions using the SiC abrasive with a grit size of 12 μm at polishing speed of 400 rpm or using the Al2O3 abrasive with a grit size of 5 μm at polishing speed of 800 rpm. Heat melt layer caused by wire electrical discharge machining (EDM) during the sample preparation was removed by MFAF without inducing new subsurface damage. The MFAF process also helps release the surface residual stress and improve the tribological performance although the surface microhardness was slightly reduced.
Keywords
Science & Technology, Technology, Nanoscience & Nanotechnology, Instruments & Instrumentation, Science & Technology - Other Topics, rapidly solidified aluminum, magnetic field-assisted finishing (MFAF), material removal, surface integrity, residual stress, tribology, MICROSTRUCTURE, ALLOYS, STEEL, STABILITY
Source Title
Micromachines
Publisher
MDPI AG
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Date
2018-04-01
DOI
10.3390/mi9040146
Type
Article