Structure-property relationships in directionally solidified single crystal NiAlThe ordered intermetallic alloy NiAl is being considered as a potential high temperature structural material, but lack of ductility at ambient temperatures, especially in polycrystalline form, is presently a major obstacle in achieving this goal. Even general agreement of the intrinsic ductility that can be achieved in monocrystals is in dispute. In order to understand this problem, two directionally solidified ingots of NiAl which displayed known differences in ductility were characterized in sufficient detail to identify the corresponding microstructural differences. It was found that the type and size of casting defects, i.e., porosity, present in the material were the major factors in controlling ductility of NiAl single crystals and could explain the order of magnitude variance in fracture strains reported in the literature.
Document ID
19880056701
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Noebe, R. D. (Michigan Univ. Ann Arbor, MI, United States)
Kim, J. T. (Michigan Univ. Ann Arbor, MI, United States)
Gibala, R. (Michigan, University Ann Arbor, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Metallic Materials
Meeting Information
Meeting: Interdisciplinary issues in materials processing and manufacturing