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The microstructural, electrical and mechanical characteristics of conventionally and rapidly solidified Ni-23 wt.% Al alloys after heat treatments were investigated. The microstructures of Ni-23Al alloys were examined by means of scanning electron microscopy and the phase composition was identified using X-ray diffraction analysis. The phase transitions during the solidification process were investigated using differential thermal analysis under an Ar atmosphere. X-ray diffraction analysis indicated that the Ni-23Al samples showed an intermetallic γ′-Ni 3 Al phase, and we observed the intermetallic γ′-Ni 3 Al phase together with the β-NiAl phase after heat treatment at 700–900°C for 24 h. We performed electrical resistivity measurements by using the four-point probe technique in the temperature range 100–900°C. The resistivity of Ni-23 wt.% Al samples increases linearly with temperature. Vickers microindentation tests were carried out on the heat-treated samples with loads ranging from 392.26 mN to 1174.86 mN at room temperature. We found that the microhardness and effective elastic modulus values increased with increasing temperature and these values showed peak load dependence. The tensile and compressive stress values of the Ni–Al alloys also decreased with increasing temperature.

Influences of high temperature on the microstructural, electrical and mechanical properties of Ni-23 wt.% Al alloy