An intermetallic compound is one consisting of two or more metallic elements present in definite proportions in alloy. They are used in a wide range of industries such as semiconductors and the aerospace industry. Thousands of tons of the nickel aluminum alloy are used worldwide every year.About the Author: J. H. Westbrook is the editor of Intermetallic Compounds, 4 Volume Set, published by Wiley. R. L. Fleischer is the editor of Intermetallic Compounds, 4 Volume Set, published by Wiley.