Mechanical Properties and Fabrication of a Nanostructured Nb-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Composite by High Frequency Induction Heating

김성은,; 오세훈,; 손인진,

doi:10.3365/kjmm.2019.57.11.701

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…oxide, the refinement of the oxide in the NCY-h sample increased the number of obstacles, leading to the refinement of the matrix grains. Hence, σ Y can be estimated using equation 2: (2) where σ Y is the estimated yield strength; σ 0 is the Peierls- The solid solution strengthening from multiple alloying elements in an Ni alloy has been investigated [17], and the strengthening can be expressed using the following relation: (3) where Δσ ss is the solid solution contribution, k i is the strengthening constant for solute i, c i is the concentration of solute i, and n is taken as 0.5 herein. For the Ni-Cr alloy, the value of k is 337 MPa at fraction -1/2 [18].…”

Section: Microstructures Of the Sintered Alloysmentioning

confidence: 99%

“…The distribution of second-phase particles can hinder the movement of the dislocations and grain boundaries and reduce the diffusion rate of metal atoms, which can effectively improve the strength and high-temperature oxidation resistance of an alloy [2]. For high-performance ODS alloys, the oxide particles need to be refined and uniformly distributed in the metal matrix [3][4][5][6]. Because the strength of an ODS alloy is proportional to the inverse of the inter-particles distance, particle size refinement and the homogeneous distribution of particles is a very effective way to improve creep resistance [5].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Ni–Cr–Y2O3 Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles

Kim¹,

Gwak²,

Lim³

et al. 2020

Korean J. Met. Mater.

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In this study, oxide (Y2O3)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH2 and the selective oxidation of Ni–YH2 to Ni–Y2O3. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was prepared with a desired composition (Ni–20wt.%Cr–1.2wt.%Y2O3) by adding Ni and Cr powders to the Ni–Y2O3 composite prepared by the new process. For comparison, a mixed powder with the same composite was prepared using a conventional mechanical alloying (MA) approach. Samples of the two powders were sintered by SPS at 850, 900, 950, and 1,000 oC. The relative densities of all samples were higher than 99.7% at all sintering temperatures. The oxide particles and matrix grain sizes of the Ni–20Cr–1.2Y2O3 alloy prepared by this new process were finer than those in alloys fabricated by conventional MA processes. Therefore, the improvement in the mechanical properties of the Ni–20Cr–1.2Y2O3 alloy prepared by the new process was attributed to the refinement of the oxide particles.

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Section: Microstructures Of the Sintered Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ni–Cr–Y2O3 Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles

Kim¹,

Gwak²,

Lim³

et al. 2020

Korean J. Met. Mater.

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Influence of particle size and fabrication method on mechanical properties of Nb-Al2O3 refractory composites under compressive loads at high temperatures

Günay,

Zienert,

Endler

et al. 2024

Ceramics International

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Rapid Sintering and Synthesis of Nanocrystalline Ta-ZrO2 Composite

Kim¹,

Shon²

2020

Korean J. Met. Mater.

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ZrO2 is a promising candidate for knee and hip joint replacements due to its excellent combination of low density, corrosion resistance and biocompatibility. Nevertheless, a low fracture toughness of pure ZrO2 at room temperature limits its wider application in the industry. One of the most obvious ways to solve the problem is to add a reinforcing phase, to produce a nanocrystalline composite material. Nanomaterials have been widely studied in recent years because they can improve hardness and fracture toughness. To produce nanocrystalline materials, the pulsed current activated sintering method has the advantage of simultaneously applying mechanical pressure and pulsed current during sintering. As a result, nanocrystalline materials can be produced within a very short time. Ta and ZrO2 nanopowders were mechanically synthesized from Ta2O5 and 2.5Zr powders according to the reaction (Ta2O5 + 5/2Zr → 2Ta + 5/2ZrO2). The synthesized powders were then sintered using pulsed current activated heating under 80 MPa uniaxial pressure within two minutes. Hardness and fracture toughness were measured using a Vickers hardness tester. The average hardness and fracture toughness of the nanocrystalline 2Ta-5/2ZrO2 composite sintered at 1350 oC were 1008 kg/mm2 and 10 MPa·m1/2, respectively. Both the hardness and fracture toughness of the composite were higher than monolithic ZrO2. The microstructure and phase of the composite was also investigated by FE-SEM and XRD.

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Mechanical Properties and Fabrication of a Nanostructured Nb-Al<sub>2</sub>O<sub>3</sub> Composite by High Frequency Induction Heating

Cited by 3 publications

References 20 publications

Microstructure and Mechanical Properties of Ni–Cr–Y2O3 Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles

Microstructure and Mechanical Properties of Ni–Cr–Y2O3 Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles

Influence of particle size and fabrication method on mechanical properties of Nb-Al2O3 refractory composites under compressive loads at high temperatures

Rapid Sintering and Synthesis of Nanocrystalline Ta-ZrO<sub>2</sub> Composite

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