Effect of doping Mg on the microstructure and mechanical behaviours of a novel Co-9Al-4.5W-4.5Mo-2Ta-0.02B alloy at room- and high-temperatures

Guo, Yijia; Zhong, Fei; Yu, Youxing; Li, Shusuo; Sha, Jiahao

doi:10.1016/j.jallcom.2017.03.259

Cited by 11 publications

(1 citation statement)

References 34 publications

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“…One can find it in numerous high entropy alloys (HEAs), in which it can be mixed with (Ti, Zr, V, Mo) [11], (Mo, Nb, Zr, Ti) [12], (Nb, Mo, W) [13,14], (Hf, Ti, Nb, Zr) [15,16] or (Co, Cr, Fe, Ni) [17], for instance. Other types of alloys currently developed for high temperature applications also include significant contents of Ta, such as the γ'-reinforced Co-Al-W alloys [18,19] and Co-Re alloys [20]. However, tantalum is also frequently found to be combined with carbon in alloys devoted to uses at very high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Surface Stabilities of {Ni-0.4C-6Ta-xCr, 0 ≤ x ≤ 50 Wt Pct} Cast Alloys at High Temperature

Berthod

2018

Metall Mater Trans A

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Nickel-based cast alloys rich in chromium and reinforced by TaC carbides are potentially very interesting alloys for applications at elevated temperatures. Unfortunately, unlike cobalt-chromium and ironchromium alloys, it is difficult to obtain exclusively TaC as primary carbides in Ni-Cr alloys. In alloys containing 30 wt.% Cr tantalum, carbides coexist with chromium carbides. The latter tend to weaken the alloy at elevated temperatures because they become rapidly spherical and then quickly lose their reinforcing effect. In this work, we attempted to stabilize TaC as a single carbide phase by testing different chromium contents in the [0; 50 wt.%] range. Six alloys containing 0.4C and 6Ta, weight contents corresponding to equivalent molar contents, were elaborated by foundry, and their as-cast microstructures were characterized. Samples of all alloys were exposed to 1127°C and 1237°C for 24 hours to characterize their stabilized microstructures. The surface fractions of chromium carbides and tantalum carbides were measured by image analysis, and their evolutions versus the chromium content were studied. For the chosen C and Ta contents, it appears that obtaining TaC only is possible by decreasing the chromium content to 10 wt.%. At the same time, TaC fractions are unfortunately too low because a large portion of tantalum integrates into the solid solution in the matrix. A second consequence is a critical decrease in oxidation resistance. Other possible methods to stabilize TaC as a single carbide are evocated, such as the simultaneous increase in Ta and decrease in chromium from 30 wt.% Cr.

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Section: Introductionmentioning

confidence: 99%

Microstructures and Surface Stabilities of {Ni-0.4C-6Ta-xCr, 0 ≤ x ≤ 50 Wt Pct} Cast Alloys at High Temperature

Berthod

2018

Metall Mater Trans A

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Effect of Rare Earth Nd on the Microstructure and Compression Behavior of Co-8.8Al-9.8 W Alloy

Ma²,

Lv³

et al. 2022

J. of Materi Eng and Perform

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High-throughput preparation and characterization of early hot-corrosion behaviors of compositional gradient Al–Cr complex coatings on a novel Co–Al–W-based alloy

Fan

Zhao

et al. 2021

Corrosion Science

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Effect of doping Mg on the microstructure and mechanical behaviours of a novel Co-9Al-4.5W-4.5Mo-2Ta-0.02B alloy at room- and high-temperatures

Cited by 11 publications

References 34 publications

Microstructures and Surface Stabilities of {Ni-0.4C-6Ta-xCr, 0 ≤ x ≤ 50 Wt Pct} Cast Alloys at High Temperature

Microstructures and Surface Stabilities of {Ni-0.4C-6Ta-xCr, 0 ≤ x ≤ 50 Wt Pct} Cast Alloys at High Temperature

Effect of Rare Earth Nd on the Microstructure and Compression Behavior of Co-8.8Al-9.8 W Alloy

High-throughput preparation and characterization of early hot-corrosion behaviors of compositional gradient Al–Cr complex coatings on a novel Co–Al–W-based alloy

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