Application of the Raman technique to measure stress states in individual Si particles in a cast Al–Si alloy

Harris, Stephen J.; O׳Neill, Ann E.; Boileau, James; Donlon, W. T.; Su, Xuming; Majumdar, Bhaskar

doi:10.1016/j.actamat.2006.10.028

Cited by 26 publications

(14 citation statements)

References 22 publications

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“…The particle stress is calculated using Eshelby's technique based on the elastic field of an inclusion . The analysis for the case of pure shear case can be used to estimate the tensile stress of particles in the elastic regime of deformation, for an applied tensile strain ϵ c , as follows:

K σ = σ_{P} = K E ϵ_{c} .

K = \frac{1 + (1 - f) γ M}{1 - f M} .

γ = \frac{7 - 5 ν}{15 true(1 - ν true)} .

M = \frac{(\frac{μ_{2}}{μ_{1}} - 1)}{true(\frac{μ_{2}}{μ_{1}} - 1 true) true{1 - γ true(1 - f true) true} + 1} .

where the ν and f are the Poisson's ratio (0.31) and the overall volume fraction of second phases ( f = 0.273), respectively.…”

Section: Discussionmentioning

confidence: 99%

“…A dislocation pileup mechanism is the most probable one among all crack‐initiation theories of the Si particles cracking for the A357 Al alloy at room temperature . Some theoretical approaches were employed to estimate stresses and damage evolution in particle‐reinforced composite systems, including both homogeneous and heterogeneous microstructures . However, these approaches are mainly based on hypoeutectic Al alloys, not necessarily valid for as‐casted Al–Si eutectic alloys with complex‐shaped and highly clustered particles, especially for higher temperature (more than 400 °C).…”

Section: Introductionmentioning

confidence: 99%

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Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Wang

Pang

et al. 2017

Adv Eng Mater

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The Al-Si piston alloys always bear different temperatures because of its peculiar component structure and service condition. Therefore, the tensile strength, elongation to fracture, and corresponding damage mechanisms of Al12SiCuNiMg piston alloys (ASPA) have been investigated with in situ technique at different temperatures. The tensile properties show two-stage tendencies: the former stage (25-280 C) is determined by easily broken phases with inherent brittleness (such as primary Si), and the fracture behavior presents rapid brittle fracture after reaching the critical stress (about 430 MPa, based on in situ technique and the elastic stress field model). The later one (280-425 C) is dominated by particles debonding and θphase coarsening. The plastic deformation behavior, dynamic recovery, and flow process become more significant on account of thermal activation. The Consid ere criterion h ¼ K indicates that the transition of damage behaviors from insufficient local strength to insufficient matrix strength and the corresponding failure model shifts from brittle to ductile fracture. Based on the damage mechanisms, the elastic field model and thermal activation relation model have been established to characterize the strength of the ASPA at different temperature ranges.

show abstract

K σ = σ_{P} = K E ϵ_{c} .

K = \frac{1 + (1 - f) γ M}{1 - f M} .

γ = \frac{7 - 5 ν}{15 true(1 - ν true)} .

M = \frac{(\frac{μ_{2}}{μ_{1}} - 1)}{true(\frac{μ_{2}}{μ_{1}} - 1 true) true{1 - γ true(1 - f true) true} + 1} .

where the ν and f are the Poisson's ratio (0.31) and the overall volume fraction of second phases ( f = 0.273), respectively.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Wang

Pang

et al. 2017

Adv Eng Mater

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“…The applied far-field loading initiates severe plastic deformation in the Al matrix around the Si particles, which leads to formation of voids in the close vicinity of the matrix/inclusion interface. In turn, these voids have twofold effect on the evolution of the local microstructure: first, the presence of the voids induces high stress concentration within the stiffer Si particles [20][21][22]; and second, they initiate new crack nucleation inside the Al matrix. As a result, the Si particles fracture, facilitating matrix cracks coalescence and eventually causing the ultimate failure of the alloy [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Characterization of fracture and debonding of Si particles in AlSi alloys

Nie

Stoilov

2010

Materials Science and Engineering: A

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“…As shown in Figure 5(b), the sample is loaded in the y-direction by an applied strain. Loading direction stresses on the surface of the water are experimentally evaluated by micro-Raman spectroscopy executed by Harris et al [60,61]. Two eutectic Si particles are singled out for interrogation.…”

Section: Comparison Of Inclusion Stresses Obtained By Raman Spectroscmentioning

confidence: 99%

Locally enhanced Voronoi cell finite element model (LE‐VCFEM) for simulating evolving fracture in ductile microstructures containing inclusions

Ghosh

2008

Numerical Meth Engineering

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SUMMARYDuctile heterogeneous materials such as cast aluminum alloys undergo catastrophic failure that initiates with particle fragmentation, which evolves with void growth and coalescence in localized bands of intense plastic deformation and strain softening. The Voronoi cell finite element model (VCFEM), based on the assumed stress hybrid formulation, is unable to account for plastic strain-induced softening. To overcome this shortcoming of material softening due to plastic strain localization, this study introduces a locally enhanced VCFEM (LE-VCFEM) for modeling the very complex phenomenon of ductile failure in heterogeneous metals and alloys. In LE-VCFEM, finite deformation displacement elements are adaptively added to regions of localization in the otherwise assumed stress-based hybrid Voronoi cell finite element to locally enhance modeling capabilities for ductile fracture. Adaptive h-refinement is used for the displacement elements to improve accuracy. Damage initiation by particle cracking is triggered by a Weibull model. The nonlocal Gurson-Tvergaard-Needleman model of porous plasticity is implemented in LE-VCFEM to model matrix cracking. An iterative strain update algorithm is used for the displacement elements. The LE-VCFEM code is validated by comparing with results of conventional FE codes and experiments with real materials. The effect of various microstructural morphological characteristics is also investigated.

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Application of the Raman technique to measure stress states in individual Si particles in a cast Al–Si alloy

Cited by 26 publications

References 22 publications

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Characterization of fracture and debonding of Si particles in AlSi alloys

Locally enhanced Voronoi cell finite element model (LE‐VCFEM) for simulating evolving fracture in ductile microstructures containing inclusions

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