The removal of copper-phase segregation and the subsequent improvement in mechanical properties of cast 319 aluminium alloys by a two-stage solution heat treatment

Sokolowski, J. H.; Sun, Xichen; Byczynski, Glenn; Northwood, Derek O.; Penrod, D.; Thomas, R. W.; Esseltine, A.

doi:10.1016/0924-0136(95)01995-q

Cited by 65 publications

(47 citation statements)

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“…The resulting improvement of the mechanical properties after T6 heat treatment is directly correlated to the interdendritic Si and the precipitation hardening as previously reported 4,20,21 . The eutectic Si is spheroidizing in shape and reduces its size during solution heat treatment.…”

Section: Vickers Micro-hardness (Hv)supporting

confidence: 51%

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Evolution of Microstructure in Al-Si-Cu System Modified with a Transition Element Addition and its Effect on Hardness

et al. 2016

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The effect of Ni 1-2 wt.% addition on the microstructure and hardness of the aged A319 alloy were studied. Characterization analyses by x-ray diffraction, optical microscopy and scanning electron microscopy suggest clearly that Ni addition forms Al-Ni-Cu-Fe, Al-Cu-Ni and Al-Ni intermetallic compounds that correlates well with equilibria conditions. Analyses by transmission electron microscopy show that aging heat treatment promotes microstructural changes in morphology, size, and spatial distribution of precipitates. Vickers micro-hardness test of Ni 1 and 2 wt.% specimens have a hardness increase from that of A319 alloy of ~6-8% with mean values of 140.98 and 142.93 HV, respectively.

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Section: Vickers Micro-hardness (Hv)supporting

confidence: 51%

“…However, it should be high enough to create the optimum conditions for Cu-rich phase dissolution and Si spheroidization. The standard T6 temper for A319 alloy consist in solution treatment for 8 h at 495 °C and artificial aging at 155 °C [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructure in Al-Si-Cu System Modified with a Transition Element Addition and its Effect on Hardness

et al. 2016

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“…This optimum condition is comparable to that recommended by Sokolowski et al [8] (double solution treatment at 495…”

Section: Corrosion Behavioursupporting

confidence: 66%

“…Accordingly, the optimum condition of T6 heat treatment with double solution treatment for the A319 alloy is not in full agreement. Moreover, the aging temperature of the T6 treatment used in the previous works using double solution treatment [8,9] was above 200…”

Section: Introductionmentioning

confidence: 99%

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Effects Of T6 Heat Treatment With Double Solution Treatment On Microstructure, Hardness And Corrosion Resistance Of Cast Al-Si-Cu Alloy

Wiengmoon¹,

Sukchot²,

Tareelap³

et al. 2015

Archives of Metallurgy and Materials

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Effects of T6 heat treatment with double solution treatment on microstructure, hardness and corrosion resistance of a cast A319 (Al-4.93wt%Si-3.47wt%Cu) alloy were investigated. The T6 heat treatment comprised of the first solution treatment at 500±5• C for 8 h, the second solution treatment in the temperature range of 510 to 530±5• C for 2 h followed by water quenching (80• C), and artificial aging at 170• C for 24 h followed by water quenching (80 • C). Microstructure of the alloy was studied by optical microscopy and electron microscopy, Rockwell hardness was measured, and corrosion resistance in 0.1 M NaCl aqueous solution was determined by a potentiodynamic technique. The results revealed that the T6 heat treatment with double solution treatment led to an improvement in corrosion resistance and comparable macrohardness as compared to those obtained from the case of single solution treatment. The second solution treatment at 520• C is the optimum leading to relatively low corrosion current density without substantial drawbacks on breakdown potential or the width of passive range.Keywords: Al-Si-Cu alloy, heat treatment, age hardening, microstructure, hardness, corrosion resistance W pracy badano wpływ obróbki termicznej T6 połączonej z podwójnym przesycaniem na mikrostrukturę, twardość oraz odporność na korozję stopu A316 (Al-4,93Si-3,47Cu w % wag.) otrzymanego metodą odlewania. Obróbkę termiczną T6 przeprowadzono w następujący sposób: w pierwszej kolejności stop poddano przesycaniu w temperaturze 500±5• C przez 8 godzin, a następnie w zakresie temperatur od 510 do 530±5• C przez 2 godziny, hartowanie wodą (80 • C) oraz sztuczne starzenie w 170• C przez 24 godziny i ponowne hartowanie wodą (80 • C). Mikrostrukturę stopu badano metodami mikroskopii optycznej i mikroskopii elektronowej. Pomiar twardości stopu wykonano metodą Rockwella. Odporność stopu na korozję w roztworze wodnym 0.1 M NaCl wyznaczono metodą potencjodynamiczną. Otrzymane wyniki wykazały, że obróbka termiczna T6 z podwójnym przesycaniem prowadzi do poprawy makrotwardości oraz odporności materiału na korozję w porównaniu do stopu poddanego pojedynczemu przesycaniu. Stwierdzono także, iż drugie przesycanie w temperaturze 520• C jest optymalne i prowadzi do stosunkowo niskiej gęstości prądu korozyjnego bez znaczących odchyleń potencjału rozkładowego lub szerokości zakresu pasywnego.

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Microstructure and Mechanical Properties of Heat-Treated B319 Alloy Diesel Cylinder Heads

Chaudhury

Apelian

Meyer

et al. 2015

Metall Mater Trans A

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The removal of copper-phase segregation and the subsequent improvement in mechanical properties of cast 319 aluminium alloys by a two-stage solution heat treatment

Cited by 65 publications

References 1 publication

Evolution of Microstructure in Al-Si-Cu System Modified with a Transition Element Addition and its Effect on Hardness

Evolution of Microstructure in Al-Si-Cu System Modified with a Transition Element Addition and its Effect on Hardness

Effects Of T6 Heat Treatment With Double Solution Treatment On Microstructure, Hardness And Corrosion Resistance Of Cast Al-Si-Cu Alloy

Microstructure and Mechanical Properties of Heat-Treated B319 Alloy Diesel Cylinder Heads

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