TY - JOUR
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.
N1 - Funding Information:
The authors thank the Japan Society for the Promotion of Science (JSPS) and the Deutsche Forschungsgemeinschaft (DFG projects Gl 181/15-1 and 15-2) for financial support. The assistance of Mr. S. Nakazawa, Mr. K. Nishida and Mr. T. Aoyagi in mechanical testing and EPMA analysis at the National Institute for Materials Science in Tsukuba, Japan is thankfully appreciated.
PY - 2007/4
Y1 - 2007/4
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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U2 - 10.1016/j.intermet.2006.09.009
DO - 10.1016/j.intermet.2006.09.009
M3 - Article
AN - SCOPUS:33947127011
VL - 15
SP - 539
EP - 549
JO - Intermetallics
JF - Intermetallics
SN - 0966-9795
IS - 4
ER -