Mechanically alloyed NiAl-TiB_2-Y_2O_3 composite (volume percentage of dispersoids about 15v%) was prepared by hot pressing. The compressive properties of the composite from 300 K to 1360 K were tested and the microstructures were studied mainly by TEM. The yield strengths of the composite at room temperature and high temperatures are considerably higher than that of monolithic NiAl and also is higher than similar NiAl-based composites which contained higher content of dispersoids but showed coarser microstructure. The possible strengthening mechanisms working in the composite are discussed.
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| [8] | NoebeRD,BowmanRR,NathalMV．Int,MaterRev,1993,38:1932AlmanDE,StoloffNS．Int．PowderMetall,1991 |
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