Effect of Sr and solidification conditions on characteristics of intermetallic in Al–Si 319 industrial alloys

Espinoza-Cuadra, J.; Gallegos-Acevedo, P.M.; Mancha-Molinar, H.; Picado, Apolinar

doi:10.1016/j.matdes.2009.06.017

Cited by 31 publications

(12 citation statements)

References 6 publications

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“…39 ' 104 Increasing the cooling rate i.e; lowering the SDAS from -110 um to an SDAS of ~35 (am has a noticeable effect in reducing the volume fraction of the /?-phase in the as-cast non-modified and Sr-modified alloys, as shown in Figure 4.18. Consequently, the 7r-phase formed as a result of the peritectic reaction which occurs during solidification in the as-cast samples (see peak 3 in Figure 4.2), is expected to decrease at the higher cooling rate.…”

Section: Effects Of Cooling Ratementioning

confidence: 97%

Effects of metallurgical parameters on the decomposition of л-AlFeMgSi phase in AL-SI-MG alloys and its influence on the mechanical properties /

Elsharkawi¹

2011

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Section: Effects Of Cooling Ratementioning

confidence: 97%

Effects of metallurgical parameters on the decomposition of л-AlFeMgSi phase in AL-SI-MG alloys and its influence on the mechanical properties /

Elsharkawi¹

2011

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“…In contrast to Al0.7Si alloy, these large clusters of intermetallics were not frequently observed in optical and SEM micrographs of the Al7Si–Sr alloy in both unHIPped and HIPped conditions. This may be attributed to the high Si content in this alloy and the presence of Sr that have been reported to fundamentally affect the evolution of intermetallics in other cast Al–Si alloys during solidification . Note, that there was no sufficient contrast to image Si particles in the Al7Si–Sr alloy although there was clear contrast between intermetallic structures and the aluminum matrix (including the eutectic silicon).…”

Section: Results and Analysismentioning

confidence: 92%

Application of X‐Ray Microtomography to Evaluate Complex Microstructure and Predict the Lower Bound Fatigue Potential of Cast Al–7(0.7)Si–4Cu–3Ni–Mg Alloys

et al. 2017

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The 3D architecture of intermetallics and porosity in two multicomponent cast Al-7(0.7)Si-4Cu-3Ni-Mg alloys is characterized using conventional microscopy and X-ray microtomography. The two alloys are found to contain intermetallic phases such as that have complex networked morphology in 3D. The results also show that HIPping does not significantly affect the volume fraction, size, and shape distribution of the intermetallic phases in both alloys. A novel technique similar to serial sectioning that circumvents quantification difficulties associated with interconnected particles is used to quantify the intermetallics. The largest particle size distribution is then correlated to fatigue performance using extreme value analysis to predict the maximum particle size in a sample of S-N fatigue specimens and subsequently, the lower bound fatigue life. The predictions are found to correlate well with fatigue data. The effect of HIPping on porosity characteristics is also characterized. Large pore clusters with complex morphology are observed in the unHIPped versions of both alloys, but more significant in the low Si (Al-0.7Si-4Cu-3Ni-Mg) alloy. However, these are significantly reduced after HIPping. The differences between 2D and 3D pore morphology and size distribution is discussed in terms of the appropriate pore size parameter for fatigue life prediction.

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“…Similar to the AA319 reference alloy, the main difference between AC and T6 was the peak ratio. There were no measurable changes in Al crystals with a volume in average dimensions crystal of 580Å 3 using the solidification rate as a fixed parameter [31,32]. On the other hand, micro-stress slightly increases proportionally to the Ce/La amount from 25% to a maximal of 36% when adding 1.0% ACL, which variation comes from the incoherent interaction between Al matrix and Ce/La needles.…”

Section: Methodsmentioning

confidence: 89%

Thermomechanical behavior of Al-Cu-Si commercial alloy modified with rare earths

2020

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The effect of cerium/lanthanum rare earths on the microstructural and mechanical behavior of an automotive grade AA319 aluminum alloy was studied at room and hot working conditions. The microstructural results in the modified AA316 aluminum alloys showed that Ce/La additions formed stable micrometric phases at room and hot working conditions, whilst a reductionin the total area of the eutectic-Si phase of up to 75\% was observed in comparison with the reference alloy. The effect of the Ce/La addition in the aluminum alloys produced an increment in hardness and UTS under room temperature; however, their mechanical behavior was improved in hot working conditions. This improvement is attained to the presence of well dispersed Ce/La phases increasing the amount of the $\theta$'-phase (Al$_2$Cu) across the aluminum matrix. The $\theta$'-phase (Al$_2$Cu) interferes directly with crack diffusion of the solid in two crystallographic directions. Additionally, it was observed through transmission electron microscopy, that Ce/La presence alters the kinetics of precipitation in the formation of the coherent $\theta$-phase from the $\theta$'-phase.

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Effect of Sr and solidification conditions on characteristics of intermetallic in Al–Si 319 industrial alloys

Cited by 31 publications

References 6 publications

Effects of metallurgical parameters on the decomposition of л-AlFeMgSi phase in AL-SI-MG alloys and its influence on the mechanical properties /

Effects of metallurgical parameters on the decomposition of л-AlFeMgSi phase in AL-SI-MG alloys and its influence on the mechanical properties /

Application of X‐Ray Microtomography to Evaluate Complex Microstructure and Predict the Lower Bound Fatigue Potential of Cast Al–7(0.7)Si–4Cu–3Ni–Mg Alloys

Thermomechanical behavior of Al-Cu-Si commercial alloy modified with rare earths

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