Abstract
The properties of the intermetallic NiAl–Ta–Cr alloy IP75 with strengthening Laves phase were studied as a function of alloy processing procedure: investment casting, hot extrusion of cast material, hot isostatic pressing (HIP), powder injection moulding (PIM) of pre-alloyed powder, and isothermal forging of HIPped material. Powder-metallurgically processed materials show finer microstructures and correspondingly reduced brittle-to-ductile transition temperatures (BDTT), lower yield stresses at all temperatures and lower creep resistances at high temperatures than cast materials. The lowest BDTT was obtained for isothermally forged material, whereas the highest yield stress was observed for remelted cast material. The effects of processing on the mechanical behaviour can be used for adjusting the property spectrum to specific applications. IP75, which is attractive for high-temperature applications because of high strength at temperatures above 1000 °C in combination with tolerable brittleness at room temperature as well as high corrosion and thermo-shock resistance, is the subject of an ongoing development aiming at applications in stationary gas turbines.
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