Details
| Original language | English |
|---|---|
| Pages (from-to) | 4042-4057 |
| Number of pages | 16 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 49 |
| Issue number | 9 |
| Early online date | 29 Jun 2018 |
| Publication status | Published - Sept 2018 |
Abstract
The alloying system Co-Al-W-Ta is comprehensively investigated in the vicinity of the compositional point Co-9Al-10W-2Ta, at. pct. These investigations provided a large amount of quantitative information, which can be used for alloy development, namely, the compositional dependences of the γ′-solvus, solidus, and liquidus temperatures; fraction of the extrinsic phases after casting; the compositional dependence of the γ/γ′-lattice misfit; the element partitioning between γ- and γ′-phases; and the two phase compositional area γ/γ′ in the Co-rich part of the Co-Al-W-Ta phase diagram at 900 °C. It is shown that additions of Ta elevate the γ′-solvus temperature and increase the γ/γ′-lattice misfit, but adding more than about 3 at. pct Ta results in a large amount of undissolvable extrinsic phases. Additionally, two Co-Al-W-Ta alloys with lower content of W were developed and solidified as [001] single crystals for mechanical testing in a temperature range between 20 and 1200 °C. These tests included measurement of the Young modulus, tensile tests with constant strain rate, and stress rupture tests. It was found that at temperatures up to about 750 °C the ultimate tensile strength of Co-Al-Ta-W alloys can be at the same level or even higher than of Ni-based superalloys.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Metals and Alloys
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In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 49, No. 9, 09.2018, p. 4042-4057.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of the γ′-Strengthened Quaternary Co-Based Alloys Co-Al-W-Ta
AU - Epishin, Alexander
AU - Petrushin, Nikolay
AU - Nolze, Gert
AU - Gerstein, Gregory
AU - Maier, Hans Jürgen
N1 - © 2018, The Minerals, Metals & Materials Society and ASM International
PY - 2018/9
Y1 - 2018/9
N2 - The alloying system Co-Al-W-Ta is comprehensively investigated in the vicinity of the compositional point Co-9Al-10W-2Ta, at. pct. These investigations provided a large amount of quantitative information, which can be used for alloy development, namely, the compositional dependences of the γ′-solvus, solidus, and liquidus temperatures; fraction of the extrinsic phases after casting; the compositional dependence of the γ/γ′-lattice misfit; the element partitioning between γ- and γ′-phases; and the two phase compositional area γ/γ′ in the Co-rich part of the Co-Al-W-Ta phase diagram at 900 °C. It is shown that additions of Ta elevate the γ′-solvus temperature and increase the γ/γ′-lattice misfit, but adding more than about 3 at. pct Ta results in a large amount of undissolvable extrinsic phases. Additionally, two Co-Al-W-Ta alloys with lower content of W were developed and solidified as [001] single crystals for mechanical testing in a temperature range between 20 and 1200 °C. These tests included measurement of the Young modulus, tensile tests with constant strain rate, and stress rupture tests. It was found that at temperatures up to about 750 °C the ultimate tensile strength of Co-Al-Ta-W alloys can be at the same level or even higher than of Ni-based superalloys.
AB - The alloying system Co-Al-W-Ta is comprehensively investigated in the vicinity of the compositional point Co-9Al-10W-2Ta, at. pct. These investigations provided a large amount of quantitative information, which can be used for alloy development, namely, the compositional dependences of the γ′-solvus, solidus, and liquidus temperatures; fraction of the extrinsic phases after casting; the compositional dependence of the γ/γ′-lattice misfit; the element partitioning between γ- and γ′-phases; and the two phase compositional area γ/γ′ in the Co-rich part of the Co-Al-W-Ta phase diagram at 900 °C. It is shown that additions of Ta elevate the γ′-solvus temperature and increase the γ/γ′-lattice misfit, but adding more than about 3 at. pct Ta results in a large amount of undissolvable extrinsic phases. Additionally, two Co-Al-W-Ta alloys with lower content of W were developed and solidified as [001] single crystals for mechanical testing in a temperature range between 20 and 1200 °C. These tests included measurement of the Young modulus, tensile tests with constant strain rate, and stress rupture tests. It was found that at temperatures up to about 750 °C the ultimate tensile strength of Co-Al-Ta-W alloys can be at the same level or even higher than of Ni-based superalloys.
UR - http://www.scopus.com/inward/record.url?scp=85049126860&partnerID=8YFLogxK
U2 - 10.1007/s11661-018-4756-3
DO - 10.1007/s11661-018-4756-3
M3 - Article
AN - SCOPUS:85049126860
VL - 49
SP - 4042
EP - 4057
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
SN - 1073-5623
IS - 9
ER -