In Situ Investigations on the Ductility of an Al-Si-Mg Casting Alloy

Doglione, R.

doi:10.1007/s11837-011-0231-y

Cited by 20 publications

(3 citation statements)

References 15 publications

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“…In both technological processes, at each stage, cracks effects, which are the main operation problems can occur. Regardless of many years of research, scientists are still unable to explain fully mechanisms of initiation of microcracks and their propagation in AlMgSi alloys [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Shaping Microstructure Technology and Properties of AlMgSi Alloys on Microcracks Formation under an Influence of Static Compression Loads

Tarasek

Sobieraj²,

Stolarska

et al. 2016

KEM

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Endeavours were undertaken to assess metallographically AlMgSi alloys, (containing 0.58 wt% of Mg, and 0.58 wt% or 6.5 wt% of Si) in their primary states as well as after applying external loads in the Static Compression Test. During the first stage of the study the primary microstructures of the investigated samples were assessed. Samples originated from two technological processes: after strain hardening, in a form of rods (φ 9.5 mm and φ 4.0 mm) gravity casting, rolling, homogenisation and precipitation hardening; and after gravity casting in sand moulds of shaped plates 100 mm x 100 mm x 4 mm of a primary structure and after the precipitation hardening. During the second stage of investigations, microstructures of analysed samples (of various technological history) were compared - after applied external loads - in order to obtain information in what way such diversified primary structure and which of its stereological parameters (amount, shape, size and placement) are essential in initiation of microcracks under static loads.

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Section: Introductionmentioning

confidence: 99%

Influence of the Shaping Microstructure Technology and Properties of AlMgSi Alloys on Microcracks Formation under an Influence of Static Compression Loads

Tarasek

Sobieraj²,

Stolarska

et al. 2016

KEM

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“…These bifilms, because of their unbonded nature, would certainly contribute to the degradation of mechanical properties, especially elongation and fatigue life. Evidence for these bifilms that remain inactive during solidification but open up during tensile testing can be seen in in situ deformation experiments in cast Al-Si alloys [72,73].…”

Section: Dendrite Arm Spacing-ductility Relationshipmentioning

confidence: 98%

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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“…Silicon particles play a key role in the solidification, microstructural development and fracture processes of Al-Si-based alloys [1][2][3][4][5][6][7][8][9]. When these alloys are mechanically strained, it is typically observed that silicon particles within the a-aluminium matrix start fracturing gradually, essentially as soon as the alloy starts to deform plastically.…”

Section: Introductionmentioning

confidence: 99%

Silicon particle pinhole defects in aluminium–silicon alloys

2016

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It was recently shown that silicon particles in heat-treated Al-Si casting alloys can contain flaws such as surface pinholes and grooves, which cause varying degrees of reduction in the in situ particle fracture strength and hence influence the mechanical properties of this class of alloys. In this work, we show that the formation of one class of such strength-limiting flaws in solidified and coarsened Si particles, namely surface pinholes, is caused by alloy impurities such as Fe and Ti in both binary eutectic Al-Si alloys and also in casting alloy A356. This is evidenced by using Focused Ion Beam serial sectioning tomography coupled with Energy-Dispersive X-Ray Spectroscopy, and confirmed by the observation that a high-purity Al-Si alloy presents a significantly lower proportion of pinholes along the surface of the silicon phase than does an alloy of commercial purity. A similar correlation between alloy purity and the formation of another, more severe strength-limiting particle defect, namely grooved interfaces, was on the other hand not found.

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In Situ Investigations on the Ductility of an Al-Si-Mg Casting Alloy

Cited by 20 publications

References 15 publications

Influence of the Shaping Microstructure Technology and Properties of AlMgSi Alloys on Microcracks Formation under an Influence of Static Compression Loads

Influence of the Shaping Microstructure Technology and Properties of AlMgSi Alloys on Microcracks Formation under an Influence of Static Compression Loads

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

Silicon particle pinhole defects in aluminium–silicon alloys

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