Microstructural Control during Processing of Aluminium Canning Alloys

Marshall, G. J.

doi:10.4028/www.scientific.net/msf.217-222.19

Cited by 34 publications

(33 citation statements)

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“…One factor that could limit the amount of Cu available for S phase formation is the presence of Fe, which can combine in some alloys with Cu to form phases of the type Al 7 Cu 2 Fe. However, literature indicates that for the present alloys and other typical canstock alloys with Cu contents below 0.1at% no Al-Cu-Fe phases will form [28,29,30], and hence all Cu should be available for S phase formation. Similar calculations for Cu-Mg clusters 6 further shows that for the present alloy with 0.07at% Cu and 1.3at%Mg, S phase dissolution during heating should be completed at about 310°C.…”

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confidence: 99%

DSC study of precipitation in an Al–Mg–Mn alloy microalloyed with Cu

Starink

Dion

2004

Thermochimica Acta

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Power compensation DSC has been employed to detect and analyse precipitation reactions in an Al-1.3Mg-0.4Mn and an Al-1.3Mg-0.4Mn-0.07Cu alloy in which very small amounts of precipitate, less than 0.3 at%, are expected to form. Due to the very small heat effects, baseline instability and drift significantly interfere with the measurements. After repeated experiments and careful baseline correction it is demonstrated that in the Cu containing alloy, ageing at 170°C causes the appearance of two endothermic effects: for 2 days ageing a small dissolution effect appears at about 230°C, whilst for 7 and 21 days ageing a dissolution effect peaking appears at about 300°C. The temperature range of the latter is consistent with S phase dissolution. IntroductionDifferential scanning calorimetry (DSC) and isothermal calorimetry are extensively used for the study of precipitation in heat treatable Al based alloys [1]. Studies are conducted on alloys in which the amount of alloying elements that precipitate is typically in the range of 1 to 10 atomic percent. For instance, in commercial Al-Cu-Mg alloys (e.g. AA2024: Al-1.6at%Cu-1at%Mg) the amount of Cu and Mg atoms that precipitate to form S phase is about 2at% [2,3], in an Al-1at%Si alloy the amount of Si that precipitates is about 1at% [4], in commercial Al-Zn-Mg-Cu based alloys the amount of precipitates is in the order of 4 to 7at% [5,6] (but these precipitates will contain some Al), in Al-Li-Cu-Mg alloys the amount of Li that precipitates to form δ' phase (Al 3 Li) is about 2 to 3 at% [7,8] and in Al-16at%Mg the amount of Mg atoms that precipitates to form β'' (Al 3 Mg) phase is about 6at% [9]. The Al alloys with the smallest amount of precipitation which have been studied by calorimetry are probably the Al-4.7at%Mg-0.25at%Cu-0.14at%Si alloy, in which about 0.5at% of Cu and Mg are expected to combine to form S phase (Al 2 CuMg) [10,11] and the Al-0.5at%Mn-0.3at%Fe based AA3003 alloy in which most of the Mn and Fe is thought to form intermetallic Al, Mn and Fe containing precipitates [12]. As far as we are aware no attempts to detect or analyse precipitation with calorimetry have been reported for metallic alloys in which the total amount of precipitating alloying elements is less than 0.5at%.The present paper reports work on a very dilute precipitation system: an Al-1.3at%Mg-0.4at%Mn alloy microalloyed with up to 0.07at%Cu. If S phase (Al 2 CuMg) forms in this alloy, the maximum

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confidence: 99%

DSC study of precipitation in an Al–Mg–Mn alloy microalloyed with Cu

Starink

Dion

2004

Thermochimica Acta

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“…The analysis of TEM micrographs of Al 6063 alloy samples, initially cold worked 30%, 60% and 90% (area reduction), succeeded with thermal treatment with time equal or exceeding 1800 s, still reveals large crystalline defects density, including, dislocations tangles, precipitates and stacking faults, being this last one unusual defect observed in Al alloys which have high stacking fault energy (SFE) [1], grain deformed by cold work and cells formation that will lead to subgrains formation inside elongated grains (Figures 19 to 22).…”

Section: Resultsmentioning

confidence: 99%

“…This hardening occurs via solution treatment and artificial aging, which provides growth control and a consistently composed in aluminum-rich matrix [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Characterization after Thermomechanical Treatments in 6063 Aluminum Alloy

Monteiro

Espósito²,

Ferrari³

et al. 2011

MSA

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“…As addressed earlier, at too high temperatures and/or low strain rates frequent inter-pass recrystallization reduces the amount of stored energy and the cube nucleation bands. Vice versa, at too low temperatures (and high strain rates) new recrystallization grains can form with more random orientations by the mechanism of particle stimulated nucleation, PSN (Engler et al 1996;Marshall 1996). In cold rolled sheets PSN recrystallization is a common feature, because industrially processed alloys always contain sufficiently large particles.…”

Section: Microstructure Evolution During Hot Rollingmentioning

confidence: 99%