Tai-Il Mah
Wright-Patterson Air Force Base
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Featured researches published by Tai-Il Mah.
Journal of Materials Research | 2000
Tieshu Huang; Mohamed N. Rahaman; Tai-Il Mah; Triplicane A. Parthasarathay
Mullite powder with a nearly stoichiometric composition was doped with 1.5–5 wt% SiO 2 or 0.5–1.0 wt% Y 2 O 3 and hot pressed at 1525–1550 °C to produce almost fully dense materials. The effect of the additives on the grain growth of the dense systems was investigated during subsequent annealing at temperatures above that of the eutectic (∼1590 °C) for the SiO 2 –Al 2 O 3 system. The average length and width of the grains were measured by image analysis of polished and etched sections. At 1750 °C, anisotropic grain growth was relatively rapid, leading to the formation of rodlike grains. Compared to the undoped mullite, the addition of SiO 2 and Y 2 O 3 produced a small reduction in the grain growth kinetics. Transmission electron microscopy revealed that the glassy second phase was concentrated at the three-grain junctions or distributed inhomogeneously at the grain boundaries. For the materials annealed at 1750 °C, the indentation fracture toughness at room temperature increased from 2.0 to 2.5 MPa m 1/2 for the undoped mullite to values as high as 4.0–4.5 MPa m 1/2 for the doped mullite. The implications of the data for enhancing the fracture toughness of mullite by the in situ development of a microstructure of elongated grains are considered.
Journal of the American Ceramic Society | 1983
Tai-Il Mah; K. S. Mazdiyasni
Journal of the American Ceramic Society | 1993
Triplicane A. Parthasarathy; Tai-Il Mah; Lawrence Matson
Journal of the American Ceramic Society | 1992
Triplicane A. Parthasarathy; Tai-Il Mah; Kristen A. Keller
Journal of the American Ceramic Society | 2003
Tai-Il Mah; Triplicane A. Parthasarathy; Emmanuel E. Boakye; P. Mogilevsky; Michael K. Cinibulk
Journal of the American Ceramic Society | 1992
Tai-Il Mah; M. Dennis Petry
Journal of the American Ceramic Society | 2005
M. Dennis Petry; Tai-Il Mah; Ronald J. Kerans
Journal of the American Ceramic Society | 2000
Tieshu Huang; Mohamed N. Rahaman; Tai-Il Mah; Triplicane A. Parthasarathay
Journal of the American Ceramic Society | 1985
Tai-Il Mah; M. G. Mendiratta; Allan P. Katz; Robert Ruh; K. S. Mazdiyasni
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 | 2008
Edmund H. Moore; Tai-Il Mah