Effect of silicon particles on the fatigue crack growth characteristics of Al-12 Wt Pct Si-0.35 Wt Pct Mg-(0 to 0.02) Wt Pct Sr casting alloys

Lee, F. T.; Major, J. F.; Samuel, F. H.

doi:10.1007/bf02647606

Cited by 76 publications

(29 citation statements)

References 18 publications

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“…They reported that fatigue cracks initiated at the silicon particles in the eutectic region, generally at triple points, and then propagated through the eutectic regions. Lee et al investigated fatigue failure characteristics and mechanisms in Al-SiMg eutectic casting alloys with a composition just beyond the eutectic point in the Al-Si equilibrium phase diagram, i.e., approximately Al-12 wt.%Si and 0.35 wt.%Mg [6]. The higher silicon content of 12% for their alloy compared to 7% Si for A356-T6 perhaps explains their observation of Si particle-induced fatigue crack formation.…”

Section: Experimental Observationsmentioning

confidence: 99%

Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Fan

Horstemeyer

Gall

2003

Engineering Fracture Mechanics

137

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Finite element analyses of micronotches including pores and silicon particles of an A356 aluminum alloy were performed to elucidate microstructure-property relations for fatigue crack incubation. Several important findings resulted. By varying the particle and pore size, spacing, aspect ratio, and clustering, the relative microstructural differences were quantified related to micronotch root cyclic plasticity. Results from realistic two-dimensional microstructures showed that minimal microstructure-scale cyclic plasticity corresponds well to the measured fatigue strength at 10 7 cycles for low porosity A356 aluminum alloy specimens. ''Realistic'' and idealized particles/pores simulations were used to formulate a local Coffin-Manson type law for crack incubation.

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Section: Experimental Observationsmentioning

confidence: 99%

Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Fan

Horstemeyer

Gall

2003

Engineering Fracture Mechanics

137

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“…Particles with a larger size will lead to fracture at a smaller f  . Fracture mechanics suggests that f  can be approximated by [25,26] :…”

Section: Porositymentioning

confidence: 99%

Solidification Behavior of Intensively Sheared Hypoeutectic Al-Si Alloy Liquid

Kotadia

Babu

Zhang

et al. 2010

Metall Mater Trans A

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Abstract:The effect of the processing temperature on the microstructural and mechanical properties of Al-Si (hypoeutectic) alloys solidified from intensively sheared liquid metal has been investigated systematically. Intensive shearing gives a significant refinement in grain size and intermetallic particle size. It is also observed that the morphology of intermetallics, defect bands and microscopic defects in high pressure die cast components are affected by intensive shearing the liquid metal. We attempt to discuss the possible mechanism for these effects.

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“…This has also been observed in other cast A356 alloys. [32][33][34][35] Additionally, porosity can be seen in both as-cast and flow-formed samples. The micropores were found to locate mainly within the eutectic regions; this has also been observed in other cast-aluminum alloys.…”

Section: Resultsmentioning

confidence: 96%

“…Other micro- structural features, e.g., eutectic Si phases, may also affect the crack path. [33][34][35][36][37][38][39] Such a region can be found from the sawtooth morphology on the crack faces, as shown in Figures 11(a) and 14(a).…”

Section: E the Role Of Micropores In Fatigue-crack Pathmentioning

confidence: 99%

Three-Dimensional Visualization of the Interaction between Fatigue Crack and Micropores in an Aluminum Alloy Using Synchrotron X-Ray Microtomography

Zhang

Toda

Hara

et al. 2007

Metall Mater Trans A

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The effect of the flow-forming process on the fatigue behavior of an Al-Si-Mg alloy was investigated using synchrotron X-ray microtomography. The fatigue life of the flow-formed-T6 specimen was found to be longer than that of the as-cast-T6 in all the selected stress amplitudes. The X-ray-scanned radiographs of a flow-formed-T6 specimen were reconstructed to allow three-dimensional (3-D) visualization of distribution of micropores and pore-crack interactions. Observations were performed on different tomographic slices to investigate the interaction between the micropores and the crack. Micropores have been associated with deflections of the crack path. Mode I and Mode II stress-intensity factors (SIFs) were calculated at each position along the fatigue-crack path using a micromechanics model. The SIF increased rapidly when the fatigue crack came close to a micropore. It was found that the average value of SIFs along entire crack paths was slightly higher than the remotely applied stress intensity, although the level of antishielding was pronounced in some local regions. Crystallographic texture is proposed to be the important factor for the observed higher fatigue resistance in flow-formed-T6 material.

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Effect of silicon particles on the fatigue crack growth characteristics of Al-12 Wt Pct Si-0.35 Wt Pct Mg-(0 to 0.02) Wt Pct Sr casting alloys

Cited by 76 publications

References 18 publications

Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Solidification Behavior of Intensively Sheared Hypoeutectic Al-Si Alloy Liquid

Three-Dimensional Visualization of the Interaction between Fatigue Crack and Micropores in an Aluminum Alloy Using Synchrotron X-Ray Microtomography

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