Effect of heat treatment on the fine structure and properties of a niobium-base superalloy

Shaboldo, O. P.; Vitorskii, Ya. M.; Сагарадзе, В. В.; Волкова, Е. Г.

doi:10.1134/s0031918x16120140

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…However, processability of alloys with large fractions of intermetallic phases, which can have extraordinary strength at high temperature but are typically brittle at low temperature, remains a significant obstacle [11]. Refractory-based superalloys, with significantly higher melting temperatures and higher specific strengths (i.e., ratio of strength-to-density), are a tantalizing prospect, though processing is extremely challenging or simply impractical using traditional methods like casting and hot-and cold-working processes [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

Jones

DelRio

Pegues

et al. 2021

Journal of Materials Research

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Ni-based superalloys have been studied extensively due to their impressive mechanical properties, including strength and creep resistance at high temperatures. Growing interest surrounding additive manufacturing (AM) methods has led to recent investigations of alloys that are traditionally difficult to process, including Ni-based superalloys. Recent work has shown that AM methods enable high-throughput materials discovery and optimization of difficult- or impractical-to-process alloys, including those with high or even majority refractory element compositions. This work focuses on AM-enabled investigations of composition-dependent mechanical and microstructural properties for Ni–Nb binary alloys. Specifically, we report on the mechanical behavior of compositionally-graded NixNb1−x and uniform composition Ni59.5Nb40.5 specimens made with AM. The AM fabrication process resulted in extraordinarily high strength, attributed to the formation of a dual-phase microstructure consisting of δ-Ni3Nb and µ-Ni6Nb7 intermetallic compounds with nanostructured and multimodal grain size and eutectic lamellar spacing. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

Jones

DelRio

Pegues

et al. 2021

Journal of Materials Research

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“…-alloys with a Nb matrix reinforced with silicides such as Nb 3 Si and/or Nb 5 Si 3 (for instance [14][15][16][17][18][19]). -alloys with reinforcement based on carbides (for instance [20][21][22]), sometimes, in association with silicides (for instance [23]).…”

Section: Introductionmentioning

confidence: 99%

Niobium Base Superalloys: Achievement of a Coherent Ordered Precipitate Structure in the Nb Solid-Solution

2019

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In a previous work, the chemical elements necessary for the achievement of Niobium base superalloys were defined in order to get a structure equivalent to that of Nickel base superalloys, which contain ordered precipitates within a disordered solid-solution. It was especially emphasized that precipitation hardening in the Niobium matrix would be possible with the addition of Ni. The remaining question about the design of such Niobium superalloys concerned the achievement of ordered precipitates in crystalline coherence with the Nb matrix i.e., with a crystalline structure equivalent to the Nb crystal prototype and with a lattice parameter in coherency with that of the Nb matrix. In order to reduce the trial/error experimental work, a reasoning based on various data for the achievement of coherency is presented. Then, starting from the Nb-Hf-Ni ternary alloy thus defined, this paper demonstrates that the precipitation of an ordered Nb phase within a disordered Nb matrix can be achieved with lattice parameter coherency between the ordered precipitates and the disordered matrix. The chemistry and the crystallographic structure of the precipitates were characterized using Transmission Electron Microscopy and Atom Probe Tomography. These results can help to conceive a new family of Nb base superalloys.

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Strong and ductile niobium-based refractory alloy via deformable zirconia nanoparticles

Chen,

Liu,

Wang

et al. 2024

International Journal of Refractory Metals and Hard Materials

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Effect of heat treatment on the fine structure and properties of a niobium-base superalloy

Cited by 3 publications

References 4 publications

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

Niobium Base Superalloys: Achievement of a Coherent Ordered Precipitate Structure in the Nb Solid-Solution

Strong and ductile niobium-based refractory alloy via deformable zirconia nanoparticles

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