Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys

M. Wenderoth; R. Völkl; S. Vorberg; Y. Yamabe-Mitarai; H. Harada; U. Glatzel

doi:10.1016/j.intermet.2006.09.009

Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys

M. Wenderoth, R. Völkl, S. Vorberg, Y. Yamabe-Mitarai, H. Harada, U. Glatzel

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

30 Citations (Scopus)

Abstract

Starting from the base composition with 12 at.% Al, 6 at.% Cr, 5 at.% Ni and Pt balance, precipitation hardened Pt-Al-Cr-Ni alloys with additions of 2 at.% Mo, Re, Ru and W, respectively, were investigated. After homogenization heat treatment and air cooling, all five-component alloys show a bimodal distribution of γ′ precipitates. Along with a fraction of fine γ′ precipitates embedded in a Pt-rich matrix, some coarse primary γ′ particles are observed. Mo, Re and W additions increase strength above 1000 °C, whereas Ru has no beneficial effect on strength. W increases the γ′ volume fraction most effectively, however, the oxidation resistance is worsened dramatically by W additions. The Re-containing alloy shows the best resistance against γ′ growth and coarsening during long-term ageing.

Original language	English
Pages (from-to)	539-549
Number of pages	11
Journal	Intermetallics
Volume	15
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2006.09.009
Publication status	Published - 2007 Apr 1
Externally published	Yes

Keywords

A. Intermetallics, miscellaneous
B. Alloy design
B. Mechanical properties at high temperatures
B. Oxidation
B. Precipitation

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys",

abstract = "Starting from the base composition with 12 at.% Al, 6 at.% Cr, 5 at.% Ni and Pt balance, precipitation hardened Pt-Al-Cr-Ni alloys with additions of 2 at.% Mo, Re, Ru and W, respectively, were investigated. After homogenization heat treatment and air cooling, all five-component alloys show a bimodal distribution of γ′ precipitates. Along with a fraction of fine γ′ precipitates embedded in a Pt-rich matrix, some coarse primary γ′ particles are observed. Mo, Re and W additions increase strength above 1000 °C, whereas Ru has no beneficial effect on strength. W increases the γ′ volume fraction most effectively, however, the oxidation resistance is worsened dramatically by W additions. The Re-containing alloy shows the best resistance against γ′ growth and coarsening during long-term ageing.",

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T1 - Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys

AU - Wenderoth, M.

AU - Völkl, R.

AU - Vorberg, S.

AU - Yamabe-Mitarai, Y.

AU - Harada, H.

AU - Glatzel, U.

PY - 2007/4/1

Y1 - 2007/4/1

N2 - Starting from the base composition with 12 at.% Al, 6 at.% Cr, 5 at.% Ni and Pt balance, precipitation hardened Pt-Al-Cr-Ni alloys with additions of 2 at.% Mo, Re, Ru and W, respectively, were investigated. After homogenization heat treatment and air cooling, all five-component alloys show a bimodal distribution of γ′ precipitates. Along with a fraction of fine γ′ precipitates embedded in a Pt-rich matrix, some coarse primary γ′ particles are observed. Mo, Re and W additions increase strength above 1000 °C, whereas Ru has no beneficial effect on strength. W increases the γ′ volume fraction most effectively, however, the oxidation resistance is worsened dramatically by W additions. The Re-containing alloy shows the best resistance against γ′ growth and coarsening during long-term ageing.

AB - Starting from the base composition with 12 at.% Al, 6 at.% Cr, 5 at.% Ni and Pt balance, precipitation hardened Pt-Al-Cr-Ni alloys with additions of 2 at.% Mo, Re, Ru and W, respectively, were investigated. After homogenization heat treatment and air cooling, all five-component alloys show a bimodal distribution of γ′ precipitates. Along with a fraction of fine γ′ precipitates embedded in a Pt-rich matrix, some coarse primary γ′ particles are observed. Mo, Re and W additions increase strength above 1000 °C, whereas Ru has no beneficial effect on strength. W increases the γ′ volume fraction most effectively, however, the oxidation resistance is worsened dramatically by W additions. The Re-containing alloy shows the best resistance against γ′ growth and coarsening during long-term ageing.

KW - A. Intermetallics, miscellaneous

KW - B. Alloy design

KW - B. Mechanical properties at high temperatures

KW - B. Oxidation

KW - B. Precipitation

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