The microstructure and precipitation kinetics of a cast aluminium alloy

Ovono, D. Ovono; Guillot, Ivan; Massinon, D.

doi:10.1016/j.scriptamat.2006.03.065

Cited by 37 publications

(17 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is an endothermic peak between 100-200 ˚C and an exothermic peak is detected between 200~350 ˚C for Al11Si3Cu alloy. Based on age precipitation analysis of Al-Si-Cu cast alloys, exothermic peak at around 250 ˚C may be caused by θ′ precipitation that are the main age hardening precipitates for Al11Si3Cu alloy [2,5] . Endothermic peak between 100-200 ˚C may be 5th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2015) caused by the dissolution of clusters or GP zones precipitated before aging, which leads to the hardness decrease at early aging stage of Al11Si3Cu alloy as shown in Fig.1.…”

Section: Resultsmentioning

confidence: 99%

“…The T4 treatment consists of solution treatment at a high temperature to dissolve the intermetallic compounds and homogenize the alloying elements in α(Al) followed by quenching at a high cooling rate to retain a high concentration of vacancies and solutes in α(Al). For Cu contain aluminum alloys, Cu atoms oversaturated in α (Al) after T4 treatment and coherent θ″ and/or θ′ phases precipitated with the duration of artificial aging treatment to produce the maximum strengthening of the material [3][4][5] . Heat treatment parameters, such as solution temperature and time, quenching temperature, artificial aging temperature and time, could have a great influence on age hardening behaviors [6,7] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Be on Aging Behavior of an Al11Si3Cu Cast Alloy

Wang¹,

Wang²

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

View full text Add to dashboard Cite

Keywords: aluminum cast alloy; age hardening; precipitation; effect of Be. Abstract. Effect of Be addition on age hardening and precipitation behaviors of Al11Si3Cu alloy was investigated by hardness measurement and differential scanning calorimetry (DSC) analysis. The age hardening results show that 0.25% Be addition increases the peak hardness of Al11Si3Cu alloy about 20HV. DSC results show that Be addition inhibits precipitation of Cu and /Si clusters or GP zones before artificial aging and increases the volume of θ′ precipitates during artificial aging. The precipitation dynamic analysis results show that θ′ phases are two-dimensional precipitates that is unaffected by Be addition. The nucleation density dependent parameter k for Be containing alloy is 2.75 times of the base alloy, which suggests that Be addition accelerates the nucleation density of θ′ phases.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Be on Aging Behavior of an Al11Si3Cu Cast Alloy

Wang¹,

Wang²

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

View full text Add to dashboard Cite

show abstract

“…the transition of to and Q precipitates can be observed after an ageing of several hours at 200 • C. Therefore, the exothermic effect is assigned to the precipitation sequence from a state with precipitates to a state with semi-coherent Q precipitates and non-coherent precipitates ( → + Q). In DSC measurements, endothermic effects are attributed to the dissolution of phases or compounds initially present in the as cast alloy [12].…”

Section: Methodsmentioning

confidence: 99%

“…1 and 2) and plate shaped ␤-Al 5 FeSi [10,11,12] (Fig. 1), as well as the Cu-containing phases, Al 2 Cu and Q-Al 5 Cu 2 Mg 8 Si 6[12], mixed up with eutectic silicon particles. The volume fraction of aluminium matrix (dentrite) is about 75%.Fig.…”

mentioning

confidence: 99%

Determination of the activation energy in a cast aluminium alloy by TEM and DSC

Ovono

Guillot

Massinon

2007

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

“…Up to now, a lot of investigations have been carried out on the microstructural formation rule and performance of Al-Cu-Si non-eutectic alloy [7][8][9] but rarely on the ternary eutectic formation mechanism of undercooled Al-Cu-Si alloys. Based on the Al-Cu-Si alloy phase diagram [10] , Al 80.4 Cu 13.6 Si 6 is the ternary eutectic composition and the eutectic transition temperature is 797 K. The location of Al 80.4 Cu 13.6 Si 6 alloy in the equilibrium phase diagram is shown in Figure 1.…”

Section: The Alloy Microstructure Consists Of Primary (Al) Dendrite mentioning

confidence: 99%

Rapid solidification of undercooled Al-Cu-Si eutectic alloys

Ruan

Wei

2009

Chin. Sci. Bull.

View full text Add to dashboard Cite

Under the conventional solidification condition, a liquid aluminium alloy can be hardly undercooled because of oxidation. In this work, rapid solidification of an undercooled liquid Al 80.4 Cu 13.6 Si 6 ternary eutectic alloy was realized by the glass fluxing method combined with recycled superheating. The relationship between superheating and undercooling was investigated at a certain cooling rate of the alloy melt. The maximum undercooling is 147 K (0.18T E ). The undercooled ternary eutectic is composed of α(Al) solid solution, (Si) semiconductor and θ(CuAl 2 ) intermetallic compound. In the (Al+Si+θ) ternary eutectic, (Si) faceted phase grows independently, while (Al) and θ non-faceted phases grow cooperatively in the lamellar mode. When undercooling is small, only (Al) solid solution forms as the leading phase. Once undercooling exceeds 73 K, (Si) phase nucleates firstly and grows as the primary phase. The alloy microstructure consists of primary (Al) dendrite, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic at small undercooling, while at large undercooling primary (Si) block, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic coexist. As undercooling increases, the volume fraction of primary (Al) dendrite decreases and that of primary (Si) block increases.liquid physics, ternary eutectic, undercooling, crystal nucleation, rapid solidification Nonequilibrium solidification of liquid alloy under the unconventional condition is a significant research subject in the field of material science and condensed physics [1][2][3][4][5][6] . Rapid solidification of alloy melt can be obtained with a low cooling rate by the undercooling method. It provides an experimental basis for investigating the thermodynamics rule and crystal growth mechanism during the nonequilibrium phase transition process. In the undercooling experiment, the undercooling level influences the crystalline dynamics mechanism drastically, which causes new microstructural characteristics. These new microstructural characteristics include the enlargement of solubility, refinement of grains, uniformity of solute distribution, formation of the metastable phase and increase of defect density and so on. The rapid solidification process of an undercooled ternary alloy is more complicated than that of a binary alloy. However, the detailed systematic investigation on the rapid eutectic growth mechanism of ternary alloys is still scarce.The Al-Cu-Si alloy system, a typical eutectic alloy system, is applied in the field of braze welding for its characteristics of low melting point, good fluidity, etc. Up to now, a lot of investigations have been carried out on the microstructural formation rule and performance of Al-Cu-Si non-eutectic alloy [7][8][9] but rarely on the ternary eutectic formation mechanism of undercooled Al-Cu-Si alloys. Based on the Al-Cu-Si alloy phase diagram [10] , Al 80.4 Cu 13.6 Si 6 is the ternary eutectic composition and the eutectic transition temperature is 797 K. The location of Al 80.4 Cu 13.6 Si 6 alloy in the ...

show abstract

The microstructure and precipitation kinetics of a cast aluminium alloy

Cited by 37 publications

References 18 publications

Effect of Be on Aging Behavior of an Al11Si3Cu Cast Alloy

Effect of Be on Aging Behavior of an Al11Si3Cu Cast Alloy

Determination of the activation energy in a cast aluminium alloy by TEM and DSC

Rapid solidification of undercooled Al-Cu-Si eutectic alloys

Contact Info

Product

Resources

About