Structure and properties of melt-spun Al-Zr-Ti alloys I. Composition of as-melt-spun ribbons

The AI-Zr-Ti system has recently been suggested as a candidate for AI-based materials capable of retaining a high strength during a long term exposure to high temperatures up to 700 K. The Al-1.25at.%(Zr+Ti) allays with a var iable Zr : Ti ratio were rapidly solidified using the chill block melt spin ning method. The homogeneity of the chemical composition was verified using the energy dispersive (EDX) and wave dispersive (WDA) X-ray analysis metho ds. The investigation of the phase composition of as-melt spun ribbons perf ormed using the small angle X-ray scattering (SAXS)method revealed the pres ence of second-phase particles. In Zr-rich alloys, the fine second-phase pa rticles were identified to be formed by the metastable Al-3(ZrxTi1-x) phase with the cubic L1(2) structure. The coarse particles present in the Ti-ric h alloys were preferably constitutional particles in the spectrum of which Fe was found.