Abstract
The well-densified Ni 3Al alloys without and with boron addition were fabricated by self-propagation high-temperature synthesis and hot extrusion (SHS/HE) technology. Microstructure investigation showed that Ni 3Al and Ni 3Al-1B alloys contained fine grain structure. Analysis of X-ray spectra as well as transmission electron microscopy studies revealed that three phases present in all alloys: γ-Ni, Ni 3Al and dispersoids of α- Al 2O 3 and γ- Al 2O 3. However, β-NiAl, Ni 3B phase and twinned Ni 3Al crystal are observed in the Ni 3Al-1B alloy. In addition, dislocations with high density exist in all alloys. The mechanical test showed that the B addition leads to obvious improvement in yield strength and compressive ductility, and compared with the ones synthesized by combustion, SHS/HE synthesized Ni 3Al and Ni 3Al-1B alloys exhibit more excellent mechanical properties.
Published Version
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