Investigation on Surface Integrity of Rapidly Solidified Aluminum RSA 905 by Magnetic Field-Assisted Finishing

Micromachines

Hao Wang¹  Jiang Guo²  Kui Liu³  Min Hao Goh³ 

[1] Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, EA-02-05, 9 Engineering Drive 1, Singapore 117575, Singapore;Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China;Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662, Singapore;

关键词: rapidly solidified aluminum;    magnetic field-assisted finishing (MFAF);    material removal;    surface integrity;    residual stress;    tribology;   

DOI  :  10.3390/mi9040146

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown