Horizontal directional solidification and precipitation hardening experiments were performed with the Al5.5Si3Cu alloy. Solidification thermal and microstructural parameters such as growth and cooling rates (VL and TR, respectively) and the secondary dendrite arm spacing (λ2) were determined experimentally. As-solidified samples were selected and submitted to the T6-heat treatment (T6-HT). The T6-HT was carried out considering two solution times: 8 and 5 h at 490 ± 2°C, followed by quenching in warm water (60 ± 2°C), aging for 5 h at 155 ± 2°C and air-cooling. Higher HV values were observed for the solution time of 5 h. As highlights of this work, the influence of the processing parameters (VL, TR and λ2) on the distribution, morphology and size of the eutectic Si particles has been investigated.
CostaTA, DiasML, GomesG, Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al-Si-Cu alloy. J Alloys Compd. 2016;683:485–494. doi: 10.1016/j.jallcom.2016.05.099
2.
CostaTA, MoreiraAL, MoutinhoDJ, Growth direction and Si alloying affecting directionally solidified structures of Al–Cu–Si alloys. Mater Sci Technol. 2015;31:1103–1112. doi: 10.1179/1743284714Y.0000000678
3.
SamuelFH, SamuelAM, DotyHW.Factors controlling the type and morphology of Cu-containing phases in 319 Al alloy (96-30). Trans Am Found Soc. 1996;104:893–902.
4.
SamuelAM, DotyHW, ValtierraS, Relationship between tensile and impact properties in Al-Si-Cu-Mg cast alloys and their fracture mechanisms. Mater Des. 2014;53:938–946. doi: 10.1016/j.matdes.2013.07.021
5.
SamuelF.Incipient melting of Al5Mg8Si6Cu2 and Al2Cu intermetallics in unmodified and strontium-modified Al-Si-Cu-Mg (319) alloys during solution heat treatment. J Mater Sci. 1998;33:2283–2297. doi: 10.1023/A:1004383203476
6.
ShabestariSG, MalekanM.Thermal analysis study of the effect of the cooling rate on the microstructure and solidification parameters of 319 aluminum alloy. Can Metall Q. 2005;44:305–312. doi: 10.1179/cmq.2005.44.3.305
7.
ShabestariSG, MoemeniH.Effect of copper and solidification conditions on the microstructure and mechanical properties of Al-Si-Mg alloys. J Mater Process Technol. 2004;153–154:193–198. doi: 10.1016/j.jmatprotec.2004.04.302
8.
ShabestariSG, ShahriF.Influence of modification, solidification conditions and heat treatment on the microstructure and mechanical properties of A356 aluminum alloy. J Mater Sci. 2004;39:2023–2032. doi: 10.1023/B:JMSC.0000017764.20609.0d
9.
SjölanderE, SeifeddineS.The heat treatment of Al-Si-Cu-Mg casting alloys. J Mater Process Technol. 2010;210:1249–1259. doi: 10.1016/j.jmatprotec.2010.03.020
10.
BarrosAS, MagnoIAB, SouzaFA, Measurements of microhardness during Transient horizontal directional solidification of Al-rich Al-Cu alloys: effect of thermal parameters, primary dendrite Arm spacing and Al2Cu intermetallic phase. Met Mater Int. 2015;21:429–439. doi: 10.1007/s12540-015-4499-2
11.
CostaM, SouzaF, MagnoI, Interrelation of solidification processing Variables and microstructure of a horizontally solidified Al-based 319.1 Alloy. Mater Sci. 2017;23:124–128.
12.
MagnoIAB, SouzaFVA, BarrosAS, Effect of the T6 heat treatment on microhardness of a Directionally solidified aluminum-based 319 alloy. Mater Res-Ibero-Am J. 2017;20:1–5.
13.
SokolowskiJH, Improvement of 319 aluminum alloy casting durability by high temperature solution treatment. J Mater Process Technol. 2001;109:174–180. doi: 10.1016/S0924-0136(00)00793-7
14.
ÇadirliE.Effect of solidification parameters on mechanical properties of Directionally solidified Al-rich Al-Cu Alloys. Met Mater Int. 2013;19:411–422. doi: 10.1007/s12540-013-3006-x
15.
MohamedAMA, SamuelFHS.Al Kahtani, influence of Mg and solution heat treatment on the occurrence of incipient melting in Al-Si-Cu-Mg cast alloys. Mater Sci Eng A-Struct. 2012;543:22–34. doi: 10.1016/j.msea.2012.02.032
16.
BritoC, ReinhartG, Nguyen-ThiH, High cooling rate Cells, dendrites, microstructural spacings and microhardness in a directionally solidified Al-Mg-Si Alloy. J Alloys Compd. 2015;636:145–149. doi: 10.1016/j.jallcom.2015.02.140
17.
CarvalhoDB, GuimarãesEC, MoreiraAL.Characterization of the Al-3wt.%Si alloy in unsteady-state horizontal directional solidification. Mater Res-Ibero-Am J. 2013;16:874–883.
18.
BouchardD, KirkaldyJS.Prediction of dendrite arm spacings in unsteady-and steady-state heat flow of unidirectionally solidified binary alloys. Metall Mater Trans B. 1997;28(4):651–663. doi: 10.1007/s11663-997-0039-x
19.
CochardA, ZhubK, JouliéaS, Natural aging on Al-Cu-Mg structural hardening alloys – investigation of two historical duralumins for aeronautics. Mater Sci Eng A-Struct. 2017;690:259–269. doi: 10.1016/j.msea.2017.03.003
20.
DehnaviM, KuhestaniF, Haddad-SabzevarM.Cooling curve analysis in binary Al-Cu alloys: Part I – effect of cooling rate and copper content on the eutectic formation. Met Mater Eng. 2015;21:195–205. doi: 10.30544/80
21.
GündüzM, ÇardiliE.Directional solidification of aluminium–copper alloys. Mater Sci Eng A. 2002;327:167–185. doi: 10.1016/S0921-5093(01)01649-5
22.
HuntJD, LuSZ.Numerical modeling of cellular/dendritic array growth: spacing and structure predictions. Metall Mater Trans A. 1996;27:611–623. doi: 10.1007/BF02648950
23.
KaygisizY, MaraşliN.Microstructural, mechanical, and electrical characterization of directionally solidified Al-Cu-Mg eutectic alloy. Phys Met Metallogr. 2017;118:389–398. doi: 10.1134/S0031918X17040123
24.
MiharaMC, MarioaraD, AndersenSJ, Precipitation in an Al-Mg-Cu alloy and the effect of a low amount of Ag. Mater Sci Eng A-Struct. 2016;658:91–98. doi: 10.1016/j.msea.2016.01.087
25.
PolmearI.Light alloys-metallurgy of the light metals. 3rd ed.London: Arnold; 1995.
26.
RingerS, HonoK, PolmearI, Nucleation of precipitates in aged Al-Cu-Mg-(Ag) alloys with high Cu:Mg ratios. Acta Mater. 1996;44:1883–1898. doi: 10.1016/1359-6454(95)00314-2
27.
RochaOFL, SiqueiraC, GarciaA.Heat flow parameters affecting dendrite spacings during unsteady-state solidification of Sn-Pb and Al-Cu alloys. Metall Mater Trans A. 2003;34:995–1006. doi: 10.1007/s11661-003-0229-3
28.
SoaresDCBL, BarrosAS, DiasM, The role of thermal and microstructural parameters on corrosion resistance of unsteady-state horizontally solidified aluminum-copper hypoeutectic alloys. Int J Electrochem Sci. 2017;12:413–428. doi: 10.20964/2017.01.63
29.
WangH, LiC, LiJ, Effect of deformation and aging on properties of Al-4.1%Cu-1.4%Mg aluminum alloy. Int School Res Not: Mater Sci. 2013;2013:1–8. doi: 10.1093/imrn/rnr226
30.
WangSC, StarinkMJ.Two types of S phase precipitates in Al-Cu-Mg alloys. Acta Mater. 2017;55:933–941. doi: 10.1016/j.actamat.2006.09.015
31.
WangSC, StarinkMJ, GaoN.Precipitation hardening in Al-Cu-Mg alloys revisited. Scripta Mater. 2006;54:287–291. doi: 10.1016/j.scriptamat.2005.09.010
32.
DjurdjevičM, StockwellT, SokolowskiJ.The effect of strontium on the microstructure of the aluminium-silicon and aluminium-copper eutectics in the 319 aluminium alloy. Int J Cast Met. Res. 1999;12:67–73. doi: 10.1080/13640461.1999.11819344
33.
DjurdjevičMB, Quantification of Cu enriched phases in synthetic 3XX aluminum alloys using the thermal analysis technique. AFS Trans. 2001;16:1–12.
34.
DjurdjevičM, GrzinčičM.The effect of major alloying elements on the size of secondary dendrite arm spacing in the As-cast Al-Si-Cu alloys. Arch Found Eng. 2012;12:19–24. doi: 10.2478/v10266-012-0004-2
35.
LiZ, SamuelAM, SamuelFH, Effect of alloying elements on the segregation and dissolution of CuAl2 phase in Al-Si-Cu 319 alloys. J Mater. Sci. 2003;38:1203–1218. doi: 10.1023/A:1022857703995
36.
HanYM, SamuelAM, SamuelFH.Effect of solution heat treatment type on the dissolution of copper phases in Al–Si–Cu–Mg type alloys. AFS Trans. 2008;116:79–90.
37.
ChenR, XuQ, GuoH, Correlation of solidification microstructure refining scale, Mg composition and heat treatment conditions with mechanical properties in Al-7Si-Mg cast aluminum alloys. Mater Sci Eng A-Struct. 2017;685:391–402. doi: 10.1016/j.msea.2016.12.051
38.
WangSS, HuangIW, YangL, Effect of cu content and aging conditions on pitting corrosion damage of 7xxx series aluminum alloys. J Electrochem Soc. 2015;162:C150–C160. doi: 10.1149/2.0301504jes
39.
ZhangX, HashimotoT, LindsayJ, Investigation of the De-alloying behaviour of θ-phase (Al2Cu) in AA2024-T351 aluminium alloy. Corros Sci. 2016;108:85–93. doi: 10.1016/j.corsci.2016.03.003
40.
SouzaF, LimaJ, BarbosaC, Microstructure and microhardness in horizontally solidified Al-7Si0.15Fe-(3Cu; 0.3Mg) alloys. Mater Sci Technol Ser. 2018;34:1252–1264. doi: 10.1080/02670836.2018.1444923
41.
AzevedoHM, MachadoGH, BarbosaCR, Microstructural Development of an AlNiBi alloy and influence of the transient horizontal solidification parameters on microhardness. Metall Mater Trans A. 2018;59:4722–4734. doi: 10.1007/s11661-018-4747-4
42.
SilvaAP, PradoIR, BarrosJS, Analysis of the cutting temperatures along the macrostructure of a directionally solidified Al-7wt%Si alloy. Defect Diffus Forum. 2015;365:116–121. doi: 10.4028/www.scientific.net/DDF.365.116
43.
SilvaCAP, LealLRM, GuimarãesEC, Influence of thermal parameters, microstructure, and morphology of Si on machinability of an Al–7.0 wt.% Si alloy directionally solidified. Adv Mater Sci Eng. 2018;18:1–12. doi: 10.1155/2018/9512957
44.
Standard practice for heat treatment of aluminum alloys, Annual Standard Book of ASTM Standards. B597. 1998;02.02:430-441.
45.
SjölanderE.Heat treatment of Al-Si-Cu-Mg casting Alloys [PhD thesis]. Göteborg, Sweden: Department of Materials and Manufacturing Technology, Chalmers University of Technology; 2011.
46.
Erol Ozbakir. Development of aluminum alloys for diesel-engine applications [PhD thesis]. Montréal (QC): Department of Mining and Materials Engineering McGill University; 2008.
47.
AraújoEC, BarrosAS, KikuchiRH, The role of Si and Cu alloying elements on the dendritic growth and microhardness in horizontally solidified binary and multicomponent aluminum-based alloys. Metall Mater Trans A. 2017;48:1163–1175. doi: 10.1007/s11661-016-3942-4
48.
TashM, SamuelFH, MucciardiF.Effect of metallurgical parameters on the hardness and microstructural characterization of as-cast and heat-treated 356 and 319 aluminum alloys. Mater Sci Eng A-Struct. 2007;443:185–201. doi: 10.1016/j.msea.2006.08.054
49.
RosaD, SpinelliJ, GarciaA.Tertiary dendrite Arm spacing during downward transient solidification of Al-Cu and Al-Si Alloys. Mater Lett. 2006;60:1871–1874. doi: 10.1016/j.matlet.2005.12.040
50.
BertelliF, BritoC, FerreiraIL, Cooling thermal parameters, microstructure, segregation and hardness in directionally solidified Al-Sn-(Si;Cu) alloys. Mater Design. 2015;72:31–42. doi: 10.1016/j.matdes.2015.02.006
51.
BöyükU, EnginS, MaraşliN.Microstructural characterization of unidirectional solidified eutectic Al-Si-Ni Alloy. Mater Charact. 2011;62:844–851. doi: 10.1016/j.matchar.2011.05.010
52.
MoustafaMA.Effect of iron content on the formation of β-Al5FeSi and porosity in Al-Si eutectic alloys. J Mater Process Technol. 2009;209:605–610. doi: 10.1016/j.jmatprotec.2008.02.073
53.
LiuK, CaoX, ChenXG.Effect of Mn, Si, and cooling rate on the formation of iron-rich Intermetallics in 206 Al-Cu cast alloys. Metall Mater Trans B. 2012;43:1231–1240. doi: 10.1007/s11663-012-9694-7
