Rapidly Solidified Lightweight Durable Disk Material.
Final rept. Jun 84-Mar 87,
PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
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A 2-year program was conducted to explore the potential of NiAl as a high temperature structural material with emphasis on overcoming the low temperature brittleness problem. The inherent ductility characteristics of binary alloys containing 29 ao Al to 54 ao Al were studied and it was observed that room temperature ductility was achieved only in alloys with lower amounts of Al. The highest Al level in which room temperature ductility was observed is process dependent, being 35 ao in the case of the melt spun alloys and 29 ao for the cast alloys. The brittle to ductile transition temperatures for the higher aluminum alloys 43 ao - 52 ao were found to be in the range 375 c to 625 c, showing no clear trends in terms of the Al content and starting form castings versus powder. Minor additions of boron significantly raised strength and the brittle to ductile transition temperature. An attempt to improve the ductility of NiAl through modification of the basic deformation behavior was made. Keywords Nickel aluminide, Ordered alloys, Intermetallic, Ductility, Disk alloys.
- Properties of Metals and Alloys