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The effect of gravity level on the average primary dendritic spacing of a directionally solidified superalloyThe effect of alternating low (0.01 g) and high (1.8 g) gravity force on the primary spacings in the dendrite structure in a directionally solidified Ni-based superalloy (PWA 1480, containing 5 pct Co, 10 pct Cr, 4 pct W, 12 pct Ta, 5 pct Al, 1.5 pct Ti, and the balance Ni) was investigated using samples solidified in a directional solidification furnace aboard the NASA KC-135 aircraft that made a series of low-g parabolas. The cross-section slices for each growth rate were polished and etched with Kallings II, and the primary dendritic arm spacings were measured using the method of Jacobi and Schwerdtfeger (1976). The arm spacings were found to fluctuate with gravity force, increasing as the gravity level decreased, and growing finer as gravity increased.
Document ID
19870044763
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mccay, M. H.
(Tennessee, University Tullahoma, United States)
Lee, J. E.
(Tennessee Univ. Tullahoma, TN, United States)
Curreri, P. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1986
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 17A
ISSN: 0360-2133
Subject Category
Materials Processing
Accession Number
87A32037
Distribution Limits
Public
Copyright
Other

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