Stabilizing the L12 structure of Pt3Al(r) in the Pt-Al-Sc system

R. Völkl; Y. Yamabe-Mitarai; C. Huang; H. Harada

doi:10.1007/s11661-005-0061-z

Stabilizing the L1₂ structure of Pt₃Al(r) in the Pt-Al-Sc system

R. Völkl, Y. Yamabe-Mitarai, C. Huang, H. Harada

Integrated Research Division

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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 are melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt₃Al_1-xSc_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 Pt₃Al_1-xSc_x(r) and the matrix decreases with increasing Sc content.

Original language	English
Pages (from-to)	2881-2892
Number of pages	12
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	36
Issue number	11
DOIs	https://doi.org/10.1007/s11661-005-0061-z
Publication status	Published - 2005 Nov

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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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 are melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt3Al1-xScx(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-xScx(r) and the matrix decreases with increasing Sc content.",

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AU - Harada, H.

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N2 - 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 are melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt3Al1-xScx(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-xScx(r) and the matrix decreases with increasing Sc content.

AB - 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 are melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt3Al1-xScx(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-xScx(r) and the matrix decreases with increasing Sc content.

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