On the strengthening behavior of ultrafine-grained nickel processed from nanopowders

Bui, Quang‐Hien; Dirras, G.; Ramtani, S.; Gubicza, Jenő

doi:10.1016/j.msea.2010.02.003

Cited by 51 publications

(18 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The larger the size of the initial particles of Ni-P alloys, the larger the grain size of Ni present in the MMC materials-about 3-5 times larger than the mean particle sizes in the initial powders (see Table 1). However, the grain growth was more important when the starting nanoparticle size was lower, indicating that the high-temperature consolidation (600 °C) resulted in grain coarsening, in agreement with previous reports [13,14]. It should be noted that the grain size of Ni3P nanoparticles increased concomitantly with that of Ni, which was the matrix phase.…”

Section: X-ray Diffraction and Tem Characterizationssupporting

confidence: 90%

From Ni–P Metastable Alloy Nanoparticles to Bulk Submicrometer Grain-Sized MMCs with Tunable Mechanical and Magnetic Properties

Bousnina

Schoenstein

Mercone

et al. 2020

Metals

View full text Add to dashboard Cite

In this study, submicrometer grain-sized metal matrix composites (MMCs) based on nickel were elaborated via a bottom-up strategy combining the polyol process and a non-conventional heat treatment route. First, four sets of nano-sized Ni–P metastable alloy nanopowders with an average particle size centered at 50, 100, 130, and 220 nm were prepared by the polyol process modified by the addition of hypophosphite (strong reducing agent) and heterogeneous nucleation using silver nitrate and platinum salt (nucleating agents). The heat treatment step was realized by reactive spark plasma sintering (R-SPS) at identical heat treatment conditions (600 °C, 53 MPa, and 10 min as holding time). R-SPS transformed the Ni–P metastable alloys into bulk submicrometer grain-sized MMCs with Ni as the matrix and Ni3P as the reinforcement. Mechanical and magnetic properties of the four MMC samples were found to be closely related to the grain size of the Ni matrix, which varied from 247 to 638 nm. Yield stress, maximum stress, and coercive field increased when the grain size decreased, while plastic strain and magnetization saturation decreased. The reinforcement Ni3P phase enhanced the mechanical characteristics of the composite. Crossover behavior was observed at around 350 nm Ni grain size, where a ductile and soft magnetic composite was tuned into a hard mechanical and semi-hard magnetic one.

show abstract

Section: X-ray Diffraction and Tem Characterizationssupporting

confidence: 90%

From Ni–P Metastable Alloy Nanoparticles to Bulk Submicrometer Grain-Sized MMCs with Tunable Mechanical and Magnetic Properties

Bousnina

Schoenstein

Mercone

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…This quantity gives the plastic work exerted until fracture, corresponding to the area under the stressstrain curve, and characterizes the toughness of the material as r e p o r t e db yB u ie ta l . [ 26]. The WoF of the deformed samples are smaller than that of initial tube samples (see Tables 4-9 given in Appendix).…”

Section: -4 / Vol 133 December 2011mentioning

confidence: 93%

Effect of Cross Section Reduction on the Mechanical Properties of Aluminium Tubes Drawn With Variable Wall Thickness

Bui

Bihamta

Guillot

et al. 2011

Journal of Manufacturing Science and Engineering

View full text Add to dashboard Cite

show abstract

“…The strain-rate sensitivity, m , measured at RT as a function of grain size for (a) fcc Ni [60][61][62] and (b) bcc Fe processed by powder metallurgy methods where k is the Boltzmann constant and T is the absolute temperature of deformation. The activation volume decreases with decreasing grain size in fcc metals [53,54].…”

Section: Defect Structure and Ductility Of Nanomaterialsmentioning

confidence: 99%

“…In addition to the strength values obtained on the samples processed by powder metallurgy (denoted by solid squares), data determined on oxide-free Ni specimens produced by electrodeposition (marked by open circles) are also plotted inFigure 5.18[62]. The latter values give a Hall-Petch relationship with the values of σ 0 = 37 MPa and k = 5,538 MPa·nm 1/2 represented by a solid straight line inFigure 5.18 .…”

mentioning

confidence: 99%

Correlation between defect structure and mechanical properties of nanocrystalline materials

Gubicza¹

2012

Defect Structure in Nanomaterials

View full text Add to dashboard Cite

The defect-related mechanical properties of nanomaterials are overviewed. The infl uence of small grain size on plastic deformation mechanisms, strength and ductility is discussed. The smaller the grain size in face-centred cubic (fcc) metals, the higher the activity of twinning at the expense of dislocation glide, while hexagonal close-packed (hcp) materials behave contrarily. The relationship between the dislocation structure and the yield strength is studied in detail. Above the grain size of ∼20 nm, the decrease of grain size is accompanied by an increase of yield strength and a decrease of ductility. The loss of ductility can be moderated by the incorporation of coarse grains into the nanocrystalline matrix. A combination of large strength with good ductility can be achieved with nanograins containing high density of twin boundaries. Below the grain size of ∼20 nm, the yield strength is found to decrease with the reduction of grain size, or remains unchanged with the experimental error. The possible explanations of this phenomenon are discussed in detail.

show abstract

On the strengthening behavior of ultrafine-grained nickel processed from nanopowders

Cited by 51 publications

References 36 publications

From Ni–P Metastable Alloy Nanoparticles to Bulk Submicrometer Grain-Sized MMCs with Tunable Mechanical and Magnetic Properties

From Ni–P Metastable Alloy Nanoparticles to Bulk Submicrometer Grain-Sized MMCs with Tunable Mechanical and Magnetic Properties

Effect of Cross Section Reduction on the Mechanical Properties of Aluminium Tubes Drawn With Variable Wall Thickness

Correlation between defect structure and mechanical properties of nanocrystalline materials

Contact Info

Product

Resources

About