Stress states in individual Si particles of a cast Al–Si alloy: Micro-Raman analysis and microstructure based modeling

Joseph, Susmitha; Kumar, Shubham; Bhadram, Venkata Srinu; Narayana, Chandrabhas

doi:10.1016/j.jallcom.2014.10.207

Cited by 26 publications

(6 citation statements)

References 28 publications

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“…The Raman technique was used to measure the stress states in Si particles embedded in a matrix such as Al . The present investigation shows that this stress value of Si particle fracture is found to be σ c ≈ 500–1000 MPa . These values will change with particle morphology.…”

Section: Discussionmentioning

confidence: 61%

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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.

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Section: Discussionmentioning

confidence: 61%

“…From the microscopic viewpoint, the second‐phase particles play an important role in the fracture process. The maximum stress in the matrix increases with increasing particle size for given volume fraction of silicon particles . However, the mechanical properties are significantly influenced by the temperature.…”

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 fracture strength of individual Si particles in Al-Si alloys has already been studied in the literature [64][65][66] by using experimental and simulation methods. The stress at which Si particle fracture occurs is much higher than the ultimate strength of alloy, but the stress concentration sites induced by the presence of defects lower substantially particle strength.…”

Section: Scenario Of Damage Evolutionsmentioning

confidence: 99%

Application of Synchrotron Radiation–Computed Tomography In-Situ Observations and Digital Volume Correlation to Study Low-Cycle Fatigue Damage Micromechanisms in Lost Foam Casting A319 Alloy

Wang¹,

Limodin

Bartali

et al. 2020

Metall Mater Trans A

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…A fracture stress of 600 MPa was reported by Harris et al [103] for a Si particle in an A319 alloy. Joseph et al [104] investigated stress development in several Si particles in a cast Al-Si-Cu-Mg alloy with four different microstructures using the Raman technique. They found the fracture stress of the Si particles to be 0.5-1.0 GPa, with fracture strains exceeding 10%.…”

Section: Si Particles In Al-si Alloysmentioning

confidence: 99%

Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

Tiryakioğlu

2020

Materials

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The metallurgy of cast aluminum alloys has always been considered to be different from that of wrought alloys. Metallurgists have been taught that pores are intrinsic in cast aluminum alloys and that mechanical properties in cast aluminum alloys are controlled by dendrite arm spacing, the presence of Fe-bearing particles, and the size of Si particles in Al–Si alloys, which fracture and debond during deformation, leading to premature failure. Whether these effects are intrinsic or extrinsic, i.e., mere correlations due to the structural quality of castings, is discussed in detail. Ideal properties are discussed, based on findings presented mostly in physics literature. Pores and hot tears in aluminum castings are extrinsic. Moreover, the effect of dendrite arm spacing on elongation, precipitation, and subsequent fracture of β–Al5FeSi platelets, and finally Si particle fracture and debonding are all extrinsic. A fundamental change in how we approach the metallurgy of cast aluminum alloys is necessary.

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Stress states in individual Si particles of a cast Al–Si alloy: Micro-Raman analysis and microstructure based modeling

Cited by 26 publications

References 28 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

Application of Synchrotron Radiation–Computed Tomography In-Situ Observations and Digital Volume Correlation to Study Low-Cycle Fatigue Damage Micromechanisms in Lost Foam Casting A319 Alloy

Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

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