The effect of Cu content on the level of microporosity in Al-Si-Cu-Mg casting alloys

Cáceres, C. H.; Djurdjevic, Mile B.; Stockwell, T.J; Sokolowski, J. H.

doi:10.1016/s1359-6462(98)00492-8

Cited by 112 publications

(64 citation statements)

References 6 publications

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“…The solidification interval decreases slowly to 91 K as the copper content increases to 10 wt%. Cáceres et al [30] investigated the effect of copper additions between 0 and 1% on the level of porosity in Al-Si-Mg alloy (A356) and found that a copper content exceeding 0.2% results in a 7-fold increase in dispersed microporosity, which is related to the formation of interdendritic ternary liquid that solidifies at a lower temperature than the Al-Si eutectic and is therefore difficult to feed. However, increasing the levels of copper beyond 1% and up to 4% results in a relatively small increase in porosity [31].…”

Section: The Effect Of Addition Of Copper To Alloy A356mentioning

confidence: 99%

Thermodynamic prediction of thixoformability in alloys based on the Al–Si–Cu and Al–Si–Cu–Mg systems

2005

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Most commercial semi-solid processing (of which thixoforming is one type) utilises the conventional casting alloys A356 and A357. There is, however, a demand to widen the range of alloys, including those with higher performance which tend to show poor characteristics for thixoforming. Thermodynamic calculation packages, such as MTDATA, provide a tool for predicting thixoformability. Here, the effects of compositional variations, in particular the effect of added copper on the thixoformability of alloy A356 and the effect of added silicon on the thixoformability of alloy 2014, have been investigated using MTDATA thermodynamic and phase equilibrium software combined with the MTAL database. Criteria for thixoformability are identified and a range of alloy compositions based on Al-Si-Cu and Al-Si-Cu-Mg evaluated in relation to these criteria. Compositions which satisfy these criteria include:-308 (Al-5.5Si-4.5Cu); 319 (Al-6Si-3.5Cu); 238 (Al-10Cu-4Si-0.3Mg); 355 (Al-5Si-1.3Cu-0.5Mg); 2014 based alloys Al-4.4Cu-0.5Mg-(4~6)Si; and a range of alloys (7.5≤Si+Cu≤9 and 1.5≤Si/Cu≤2.33) and alloys (9

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Section: The Effect Of Addition Of Copper To Alloy A356mentioning

confidence: 99%

Thermodynamic prediction of thixoformability in alloys based on the Al–Si–Cu and Al–Si–Cu–Mg systems

2005

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“…Al-A319 alloys nominally contain several percents of Si. Other elements such as Cu and Mg are typically incorporated in Al-A319 alloys to improve the room and high temperature strength [4,5].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on the Tensile Properties of Precipitation-Hardened Al-Mg-Cu-Si Alloys

Ferguson

López

Cho

et al. 2016

Metals

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Abstract:Because the mechanical performance of precipitation-hardened alloys can be significantly altered with temperature changes, understanding and predicting the effects of temperatures on various mechanical properties for these alloys are important. In the present work, an analytical model has been developed to predict the elastic modulus, the yield stress, the failure stress, and the failure strain taking into consideration the effect of temperatures for precipitation-hardenable Al-Mg-Cu-Si Alloys (Al-A319 alloys). In addition, other important mechanical properties of Al-A319 alloys including the strain hardening exponent, the strength coefficient, and the ductility parameter can be estimated using the current model. It is demonstrated that the prediction results based on the proposed model are in good agreement with those obtained experimentally in Al-A319 alloys in the as-cast condition and after W and T7 heat treatments.

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“…In general, however, three main solidification reactions are exhibited during the solidification process. 91,92 Initially, aluminium dendrites (liquidus) are formed, followed by the development of two main eutectic phases. The presence of alloying and impurity elements, such as Cu, Mg, Mn and Fe, leads to more complex constituents.…”

Section: Intermetallic Precipitation and Solidificationmentioning

confidence: 99%

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Culliton¹,

Betts²,

Kennedy³

2013

International Journal of Cast Metals Research

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The role of various intermetallic precipitates (IMPs), or secondary phase particles, in governing the wear and corrosion performance characteristics of cast aluminium alloys is outlined in this brief review. Such alloys are especially important in transport applications where their low weight, low cost and recyclability make them very attractive. However, alloy wear and/or corrosion behaviour often limit their industrial application, and more work needs to be carried out to extend their use into other areas. Careful control of IMP nucleation and growth rates may be beneficial, especially in alloys exposed to corrosive environments. Silicon, copper and magnesium are all important elements for enhanced mechanical strength and tribological performance but often to the detriment of alloy corrosion resistance. Other elements such as iron may also play a significant role in deleterious IMP formation. Use of dispersoids based on novel (quasicrystals) seed alloys with similar lattice characteristics to the a-Al matrix may result in further exploitation of these alloys.

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The effect of Cu content on the level of microporosity in Al-Si-Cu-Mg casting alloys

Cited by 112 publications

References 6 publications

Thermodynamic prediction of thixoformability in alloys based on the Al–Si–Cu and Al–Si–Cu–Mg systems

Thermodynamic prediction of thixoformability in alloys based on the Al–Si–Cu and Al–Si–Cu–Mg systems

Temperature Effects on the Tensile Properties of Precipitation-Hardened Al-Mg-Cu-Si Alloys

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

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