Abstract
The Pt-Al system has high potential to act as alloy base for so-called refractory superalloys. Although the envisaged strengthening phase Pt3Al(r) has favorable L12 crystal structure only at high temperatures, even small amounts of Sc stabilized L12 crystal structure at low temperature. Pt-Al-Sc alloys were arc melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt3Al1−x Sc x (r) forms a continuous phase field from the Al-rich side to the Sc-rich side of the Pt-Al-Sc ternary system. The absolute value of the lattice misfit between cubic Pt3Al1−x Sc x (r) and the matrix decreases with increasing Sc content.
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