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Proceedings Paper

Investigation of rapidly solidified aluminum by using diamond turning and a magnetorheological finishing process
Author(s): Yuan-Chieh Cheng; Wei-Yao Hsu; Ching-Hsiang Kuo; Khaled Abou-El-Hossein; Timothy Otieno
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Paper Abstract

The metal mirror has been widely used in optical application for a longtime. Especially the aluminum 6061 is often considered the preferred material for manufacturing optical components for ground-based astronomical applications. One reason for using this material is its high specific stiffness and excellent thermal properties. However, a large amount of data exists for this material and commercially available aluminum 6061 using single point diamond turning (SPDT) and polishing process can achieve surface roughness values of approximately 2 to 4 nm, which is adequate for applications that involve the infrared spectral range, but not for the shorter spectral range. A novel aluminum material, fabricated using a rapid solidification process that is equivalent to the conventional aluminum 6061 alloy grade has been used in optical applications in recent years because of its smaller grain size. In this study, the surface quality of the rapid solidification aluminum after single point diamond turning and followed by magnetorheological finish (MRF) process is investigated and compared with conventional aluminum 6061. Both the surface roughness Ra was evaluated using white light interferometers. Finally, indicators such as optimal fabrication parameter combination and optical performance are discussed.

Paper Details

Date Published: 27 August 2015
PDF: 8 pages
Proc. SPIE 9575, Optical Manufacturing and Testing XI, 957519 (27 August 2015); doi: 10.1117/12.2186725
Show Author Affiliations
Yuan-Chieh Cheng, Instrument Technology Research Ctr. (Taiwan)
Wei-Yao Hsu, Instrument Technology Research Ctr. (Taiwan)
Ching-Hsiang Kuo, Instrument Technology Research Ctr. (Taiwan)
Khaled Abou-El-Hossein, Nelson Mandela Metropolitan Univ. (South Africa)
Timothy Otieno, Nelson Mandela Metropolitan Univ. (South Africa)

Published in SPIE Proceedings Vol. 9575:
Optical Manufacturing and Testing XI
Oliver W. Fähnle; Ray Williamson; Dae Wook Kim, Editor(s)

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