Failure mechanisms in pre-cracked Ni-graphene nanocomposites

Muller, Scott E.; Santhapuram, Raghuram R.; Nair, Arun K.

doi:10.1016/j.commatsci.2018.06.013

Cited by 23 publications

(3 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ni constitutes a prominent metal-matrix material and has been used in a variety of both experimental and computational studies of Ni-graphene nanocomposites [23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Vardanyan

Urbassek

2020

Materials

View full text Add to dashboard Cite

Nanoindentation simulations are performed for a Ni(111) bi-crystal, in which the grain boundary is coated by a graphene layer. We study both a weak and a strong interface, realized by a 30 ∘ and a 60 ∘ twist boundary, respectively, and compare our results for the composite also with those of an elemental Ni bi-crystal. We find hardening of the elemental Ni when a strong, i.e., low-energy, grain boundary is introduced, and softening for a weak grain boundary. For the strong grain boundary, the interface barrier strength felt by dislocations upon passing the interface is responsible for the hardening; for the weak grain boundary, confinement of the dislocations results in the weakening. For the Ni-graphene composite, we find in all cases a weakening influence that is caused by the graphene blocking the passage of dislocations and absorbing them. In addition, interface failure occurs when the indenter reaches the graphene, again weakening the composite structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Vardanyan

Urbassek

2020

Materials

View full text Add to dashboard Cite

show abstract

“…The ε and σ are calculated as the geometric average of ε 12 = √ ε 11 ε 22 and the arithmetic average of σ 12 = (σ 11 + σ 22 )/2, respectively. In this work, ε 13 = 0.024 99 eV and σ 13 = 2.85 Å for Ni-C interaction are chosen from Huang et al [36,37], and ε 23 = 0.034 36 eV and σ 23 = 3.01 Å for Al-C interaction are adopted from Choi et al [24]. The numbers 1, 2, and 3 denote Ni, Al, and C atoms, respectively.…”

Section: Potential Functionsmentioning

confidence: 99%

“…However, it is not available for everyone since it needs work to compound. So, to minimize the deviation of our research, we would like to utilize the relatively reliable L-J potential [23,36,37] and pairwise Morse potential [41,42] to simulate the C-Ni covalent interactions. Among many reports simulating with morse potential, huge differences can be found from each other.…”

Section: Potential Functionsmentioning

confidence: 99%

Mechanical properties of CNT-reinforced Ni₃Al composites: the role of chirality, temperature, and volume fraction

Wang¹,

Yang²,

Shang³

et al. 2020

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

is an extremely significant reinforcing phase in nickel-based single crystal superalloys. As an alternative strengthening method to improve its mechanical properties, carbon nanotube (CNT)-reinforced composites have recently been synthesized in experiments. Here, in order to explore the corresponding influence factors and the underlying mechanism, tensile and compressive mechanical properties of CNT- composites are systematically investigated by using molecular dynamics simulations. It is shown that the dispersion of a minor fraction of a CNT into matrix leads to a sufficient enhancement in the stiffness of CNT- composites compared with the pure . It is demonstrated that CNT reinforcement takes effect in the elastic stage under compression while it works continuously during tension. Compared with armchair CNTs, zigzag CNTs are predicted to provide more strength for raising the elastic modulus while armchair CNTs can provide superior elongation. Particularly, CNTs are found to hinder the generation of slip bands under tensile loading owing to the robust interfacial interactions. Furthermore, quantitative analysis reveals that the impact of volume fraction of CNT is much more significant than the size effect. The role of chirality, temperature and volume fraction of CNT obtained in the present work could provide beneficial references for subsequent theoretical and experimental investigations, and shed some light on the design of CNT-reinforced composites in nanoscale engineering.

show abstract

Effect of carbon black silanization on isothermal curing kinetics of epoxy nanocomposites

Soltani

Razinobakht

Asmatulu

2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

The present study was carried out to determine the effect of carbon black (CB) nanofiller silanization and loading on isothermal curing kinetics of epoxy nanocomposites. The epoxy resin specimens incorporated with 2, 4, and 8 wt% pristine CB and silanized CB were cured at isothermal temperatures of 43, 60, and 104°C. Differential scanning calorimetry was used to characterize the curing kinetics, Fourier transform infrared spectroscopy was employed to confirm silanization of CB nanofillers, and scanning electron microscopy was utilized to study the morphology of nanocomposite specimens. It was also observed that the silanization did not change the curing kinetics of CB nanocomposites significantly as compared to the neat epoxy resin. However, the curing reactions of the pristine CB nanocomposites were slower than the neat epoxy resin marked by an average 10 and 4% decrease in the final degree of cure for the nanocomposite specimens cured at 43 and 60°C, respectively. The morphological studies revealed that the silanized CB particles exhibited a more stable and homogeneous dispersion in the epoxy resin than the pristine CB particles. Potential applications for the fabricated nanocomposites include sensors, actuators, and conductive coatings for electrostatic dissipation control in plastic parts.

show abstract

Failure mechanisms in pre-cracked Ni-graphene nanocomposites

Cited by 23 publications

References 71 publications

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Mechanical properties of CNT-reinforced Ni₃Al composites: the role of chirality, temperature, and volume fraction

Effect of carbon black silanization on isothermal curing kinetics of epoxy nanocomposites

Contact Info

Product

Resources

About

Failure mechanisms in pre-cracked Ni-graphene nanocomposites

Cited by 23 publications

References 71 publications

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Mechanical properties of CNT-reinforced Ni3Al composites: the role of chirality, temperature, and volume fraction

Effect of carbon black silanization on isothermal curing kinetics of epoxy nanocomposites

Contact Info

Product

Resources

About

Mechanical properties of CNT-reinforced Ni₃Al composites: the role of chirality, temperature, and volume fraction