Effect of surface grinding on the strength of NiAl and Al2O3/NiAl composites
Journal
Materials Chemistry and Physics
Journal Volume
59
Journal Issue
3
Pages
220-224
Date Issued
1999
Author(s)
Abstract
For structural applications, dimensional tolerance has to be controlled tightly. Surface grinding is thus frequently applied to match the requirement. For brittle material, improper surface grinding can degrade their strength considerably. In the present study, an alumina wheel and a diamond wheel were used to grind NiAl and Al2O3/NiAl composites. The surface quality, strength and toughness after grinding are investigated. Cracks are formed on the surface of NiAl ground with the alumina wheel. However, there is no crack found on the surface of NiAl ground with the diamond wheel. The strength of the NiAl machined with diamond wheel is three times that of the NiAl machined with alumina wheel. As Al2O3 particles are added into NiAl, the presence of weak Al2O3/NiAl interfaces limits the formation of large flaws. The strength of the Al2O3/NiAl composites is thus less sensitive to the grinding conditions. The present study demonstrates that the Al2O3/NiAl composites are tolerant to the surface grinding conditions.
Type
journal article