ملخص: Yield stress in compression (0.2% flow stress) from ambient temperature up to 800 [deg]C has been studied on Ni3(Al, Si) alloy with the atomic composition Ni78Al11Si11. When annealed at 1000 [deg]C, the alloy has a pure L12 ([gamma]′) ordered structure. After subsequent annealing at 750 [deg]C, the disordered solid solution of Al and Si in Ni (face centred cubic, [gamma]) precipitates in fine coherent particles. Calorimetry helps to describe the various phase transformations necessary to obtain the last microstucture. Solute addition of Si, which replaces Al atoms, increases the 0.2% flow stress of Ni3Al in the fully [gamma]′ microstructure. The [gamma] precipitation shifts the peak stress towards higher temperatures and stresses.

لغة: إنجليزية