On improving the fracture toughness of a NiAl-based alloy by mechanical alloyingMechanical alloying (MA) has been used to process the NiAl-based alloy Ni-35Al-20Fe, such that a fine-grain (about 2 microns) microstructure is obtained through the addition of 2 vol pct Y2O3 particles. When compared to a conventionally processed, coarse-grained (about 28 microns) Ni-35-20 alloy without the Y2O3 particles, the MA alloy exhibits two to three times higher fracture toughness values, despite a 50-percent increase in yield strength. Room-temperature K(O) values as high as 34 MPa sq rt m are observed, accompanied by a yield strength in excess of 1100 MPa. Fractography confirms a change in fracture characteristics of the fine-grained MA alloy.
Document ID
19920048170
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kostrubanic, J. (NASA Lewis Research Center Cleveland, OH, United States)
Koss, D. A. (Pennsylvania State University University Park, United States)
Locci, I. E. (NASA Lewis Research Center Cleveland, OH, United States)
Nathal, M. (NASA Lewis Research Center Cleveland, OH, United States)