Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; Alloys

Tang, Qingxin; Hoshino, Takao; Ukai, Shigeharu; Leng, Bin; Hayashi, Shigenari; Wang, Yongming

doi:10.2320/matertrans.m2010163

Cited by 50 publications

(20 citation statements)

References 12 publications

(7 reference statements)

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“…Eventually coherency between oxide particles and matrix would be affected and oxide particles are coarsened to reduce the interfacial energy by consuming other particles. 6) …”

Section: Hfc ð13þmentioning

confidence: 99%

“…4) Recently some research pointed out that other minor element additions, such as Ti or Hf, can replace the YAlO system oxide to Y(Ti,Hf )O system oxide, which was reported to be responsible for particle refinement. 5,6) The pinning effect indicates that yield stress of ODS superalloys depends on the mean distance between the particles (denoted as separation), which is resulted from the number density of the oxide particle. Thus particle refinement and resultant separation reduction and homogenizing the distribution of fine particles are essential for improving the strength of Ni-based ODS superalloys at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Tang¹,

Ukai²,

Oono³

et al. 2012

Mater. Trans.

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Oxide particle refinement, which improves high temperature strength in Ni-based oxide dispersion strengthened (ODS) superalloys, was investigated by employing Hf addition during mechanical alloyed (MA) process. TEM micrographs show that 2 mass% Hf addition makes the smallest oxide particles and shortest separation in the base alloy (Ni4.5 mass%Al1 mass% Y 2 O 3 ). Formation of Y 2 Hf 2 O 7 is confirmed to be responsible for the oxide particle refinement with XRD analysis. By the calculation and comparison based on hardness and Orowan mechanism, the improvement of hardness by Hf addition attributes to the dispersion strengthening of oxide particles.

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“…Eventually coherency between oxide particles and matrix would be affected and oxide particles are coarsened to reduce the interfacial energy by consuming other particles. 6) …”

Section: Hfc ð13þmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Tang¹,

Ukai²,

Oono³

et al. 2012

Mater. Trans.

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“…Nickel based alloys are promising candidates for such applications due to their excellent corrosion resistance at elevated temperatures [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Homogeneous dispersion of nanometric stable oxide particles in the matrix of nickel based ODS alloys can act as effective barriers against dislocation motion [2,[5][6][7] and improve high temperature mechanical properties including creep strength [8]. The pinning effects of oxide nanoparticles depend on the mean particle separation (the mean distance between the particles) which is a direct result of the particle number density [1]. According to theoretical calculations and experiments, a combination of a mean particle separation of 100-250 nm for 10-20 nm yttria particles and grain aspect ratio of a minimum of 10 could be promising for high-temperature applications [3,6].…”

Section: Introductionmentioning

confidence: 99%

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Pasebani

Dutt

Burns

et al. 2015

Materials Science and Engineering: A

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Oxide dispersion strengthened (ODS) nickel based alloys were developed via mechanical milling and spark plasma sintering (SPS) of Ni-20Cr powder with additional dispersion of 1.2 wt.% Y 2 O 3 powder. Furthermore, 5 wt.% Al 2 O 3 was added to Ni-20Cr-1.2Y 2 O 3 to provide composite strengthening in the ODS alloy. The effects of milling times, sintering temperature, and sintering dwell time were investigated on both mechanical properties and microstructural evolution. A high number of annealing twins was observed in the sintered microstructure for all the milling times.However, longer milling time contributed to improved hardness and narrower twin width in the consolidated alloys. Higher sintering temperature led to higher fraction of recrystallized grains, improved density and hardness. Adding 1.2 wt.% Y 2 O 3 to Ni-20Cr matrix significantly reduced the grain size due to dispersion strengthening effect of Y 2 O 3 particles in controlling the grain boundary mobility and recrystallization phenomena. The strengthening mechanisms at room temperature were quantified based on both experimental and analytical calculations with a good agreement. A high compression yield stress obtained at 800 °C for Ni-20Cr-1.2Y 2 O 3 -5Al 2 O 3 alloy was attributed to a combined effect of dispersion and composite strengthening.

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“…25,26) As the aging time is prolonged, £A phase gradually precipitates, and the corresponding microhardness increases. The microhardness data reveals a maximum of approximately 620 Hv for the specimens aged for 72 h. As the aging time is further increased, the alloys exhibit a moderate decline in the hardness.…”

Section: Microhardnessmentioning

confidence: 99%

Microstructural Development and Coarsening Behavior of γ′ Precipitates in Co–Ni–Al–W-Base ODS Alloys

Lin

Qin

et al. 2012

Mater. Trans.

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CoNiAlW-base alloy, strengthened by nanosized oxide and £A precipitate is a novel type of high-temperature structural material. The microstructural evolution of the alloys during heat treatment was investigated, and the ££A misfit and the coarsening kinetics of £A precipitate were discussed. The alloys consisted of £/£A two-phase region, discontinuously formed area and several secondary phases (Al x Co, Co 3 W and Co 7 W 6 ). An increase in the solution temperature and Ni contents favored the precipitation of £A phase due to the enhanced solid solubility of Al and W in cobalt matrix. The ordered arrangement of near cuboidal £A precipitates was observed, and the ££A misfit was calculated to be 0.57%. The coarsening kinetics of £A precipitates conformed to the L-S-W model. The Arrhenius analysis yielded the activation energy of 188 KJ·mol ¹1 .

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Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y<SUB>2</SUB>O<SUB>3</SUB> Alloys

Cited by 50 publications

References 12 publications

Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Microstructural Development and Coarsening Behavior of γ′ Precipitates in Co–Ni–Al–W-Base ODS Alloys

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Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y<SUB>2</SUB>O<SUB>3</SUB> Alloys

Cited by 50 publications

References 12 publications

Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Microstructural Development and Coarsening Behavior of &gamma;&prime; Precipitates in Co&ndash;Ni&ndash;Al&ndash;W-Base ODS Alloys

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Microstructural Development and Coarsening Behavior of γ′ Precipitates in Co–Ni–Al–W-Base ODS Alloys