Chapter 5. Intermetallics
- James K. Wessel Editor in chief
Published Online: 8 JUN 2004
Copyright © 2004 John Wiley & Sons, Inc.
Handbook of Advanced Materials: Enabling New Designs
How to Cite
Wessel, J. K. and Sikka, V. (2004) Intermetallics, in Handbook of Advanced Materials: Enabling New Designs (ed J. K. Wessel), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471465186.ch5
Wessel & Associates, 127 Westview Lane, Oak Ridge, Tennessee 37830, USA
- Published Online: 8 JUN 2004
- Published Print: 16 APR 2004
Print ISBN: 9780471454755
Online ISBN: 9780471465188
- nickel aluminide;
- Hastalloy D;
- wear resistance;
- carburizing resistance;
- corrosion resistance;
- Oak Ridge National Laboratory;
- US Department of Energy;
- transfer rolls;
- furnace trays;
Intermetallics is the name for a broad class of metals resulting from the combination of various elements including nickel aluminide, titanium aluminide, niobium aluminide, iron aluminide, iron silicide and various other silicides. Each has a unique set of properties. Titanium aluminide is valued for light weight (lower than nickel-based superalloys), oxidation resistance and stiffness. Niobium aluminide is light weight and with a melting point of 2060C operates at higher temperatures than nickel-based superalloys but, has low fracture toughness and poor oxidation resistance at elevated temperatures.
Other silicides are used for their oxidation resistance. All have attractive melting temperatures with some reaching 2400C. They are also used as coatings to protect other materials such as niobium aluminide from oxidation.
Recent improvements in the nickel aluminide composition Ni3Al resulted in a ductile high temperature, strong, hard and thermally stable intermetallic that combines lower density (25% less than super alloys), and resistance to wear, deformation, fatigue, oxidation, carburization and coking.