A wide range of properties can be achieved in intermetallic coatings applied by gas detonation spraying (GDS). The properties of Fe-40at%Al GDS layers, however, may change when exposed to temperatures exceeding a threshold level. To characterize such changes, Fe-40at%Al GDS coatings were subjected to systematic dilatometric studies in which temperatures were cycled from room temperature to 1180 °C. The investigation revealed both irreversible and reversible phase transitions as described in the paper. Dilatometry measurements obtained from sintered samples made from the same powder are presented for comparison.

dilatometry, FeAl composite powder, gas detonation spraying, iron-aluminide coating, phase transition, thermal expansion coefficient
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Copyright © 2019 ASM International. All rights reserved.
2019
ASM International
Topics
Ceramic coating Detonation gun spraying Coefficient of thermal expansion Phase transition temperatures Iron-aluminide composites Extensometers
Issue Section:
Materials and Technology
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