The role of Hf and TiC additions in the mechanical properties and microstructure of NbAlV alloys

Ding, Rengen; Jones, I.P.; Jiao, Huisheng

doi:10.1016/j.msea.2009.03.016

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…-25Cr-0.4C-6M with M = 2/3 Ta and 1/3 Hf for one alloy (named "T alloy") or M = 2/3 Hf and 1/3 Ta for the second alloy (named "H alloy"). This supposes the introduction of hafnium with unusually high concentrations (2 and 4 wt.% Hf), compared to other Ni-based superalloys [12,13], nickel aluminides [14], single crystals [15], Nb-based refractory alloys [16,17] or HEAs (High Entropy Alloys) [18][19][20].…”

Section: Design Of the Alloysmentioning

confidence: 99%

Oxidation and Microstructural Behaviors of Ni-Based Alloys Strengthened by (Ta, Hf)C Carbides at 1250 °C in Air

2021

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Two alloys based on nickel and designed to be reinforced by MC carbides thanks to the presence of Hf and Ta were produced by casting. They were subjected to 50 h-long isothermal exposure at 1250 °C in synthetic air with thermogravimetric monitoring of the oxidation progress. In the as-cast state, they contain both significant quantities of (Hf,Ta)C carbides. Their verified melting start temperatures, close to 1300 °C, allowed performing the planned oxidation test. The two alloys demonstrated a chromia-forming behavior with limited mass gain rates. However, they also showed a rather low resistance to oxide spallation at cooling, which is in proportion with the Ta/Hf ratio. After 50 h at 1250 °C, the morphology of the carbides had significantly evolved, from their initial script-like shape to a fragmented and coalesced state. The results are promising, but the use of these alloys at 1250 °C needs further improvements on the mechanical level.

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Section: Design Of the Alloysmentioning

confidence: 99%

Oxidation and Microstructural Behaviors of Ni-Based Alloys Strengthened by (Ta, Hf)C Carbides at 1250 °C in Air

2021

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“…Hafnium has been known for several decades as an important element for superalloys [4], even if it is not frequently met in their chemical compositions. Its recognized beneficial effects are related to the resistance against oxidation at high temperature of alloys of various families: NiAl or NiAlPt alloys [5,6], NbAlV alloys [7], NbSiCr alloys [8] and high entropy alloys [9][10][11]. However, hafnium is also a strong MC-forming element (MC: monocarbide), leading notably to carbides which show remarkable stability at elevated temperatures in cobalt-based model alloys [12].…”

Section: Introductionmentioning

confidence: 99%

Oxidation and Microstructural Behaviors at 1200 °C of 32.5 wt.% Cr–Containing Co–Based Alloys Strengthened by HfC Carbides

Berthod

2022

Crystals

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Two alloys based on cobalt, designed to be reinforced by HfC and containing chromium with content beyond 30 wt.%, were produced by casting. They were subjected to a 46 h–long isothermal exposure at 1200 °C in synthetic air with thermogravimetric monitoring of the oxidation progress. In the as–cast state, the two alloys contain high quantities of script–like shaped HfC carbides. Both of them demonstrated a much better behavior than previous similar alloys containing only 25 wt.% Cr. After 46 h at 1200 °C, the morphology of the carbides had almost not evolved. The control of the creep behavior at 1200 °C showed that these oxidation–resistant alloys are, additionally, as creep–resistant as the 25 wt.% Cr containing previous alloys.

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The role of Hf and TiC additions in the mechanical properties and microstructure of NbAlV alloys

Cited by 6 publications

References 24 publications

Oxidation and Microstructural Behaviors of Ni-Based Alloys Strengthened by (Ta, Hf)C Carbides at 1250 °C in Air

Oxidation and Microstructural Behaviors of Ni-Based Alloys Strengthened by (Ta, Hf)C Carbides at 1250 °C in Air

Oxidation and Microstructural Behaviors at 1200 °C of 32.5 wt.% Cr–Containing Co–Based Alloys Strengthened by HfC Carbides

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