Forming Al alloys using the semi-solid method could largely overcome major problems of the die casting process. The cooling slope method is applied by pouring the melt on to the cooling slope to refine and spherodize it. Applying the cooling slope method in casting is relatively simple, yet financially beneficial in terms of required equipment, not to mention the fact that it is capable of producing semi-solid slurries. Parameters to be considered in this method include die temperature and heat treatment; both affecting microstructure and mechanical properties of the work piece. In this study, pouring conditions were 60° slope angle and 400mm length. Under these conditions, the highest obtained hardness was 77HB. Three different temperatures (25°C, 300°C, and 600°C) were compared in order to obtain the most suitable microstructure. The 300°C die temperature was found to result in the optimum microstructure. Thereafter, samples produced under the optimum die temperature were reheated in 580°C for 5, 10, and 15min and then immediately quenched in 25°C water. Results indicate that samples obtained from 10min heating had finer and more proportional microstructure, and under this condition hardness was increased from 80.6HB to 87.1HB.
FanZ., ‘Semisolid metal processing’Int. Martial Rev.147 (2) (2002): 6–8.
2.
NeuyebauerR.BranchH., ‘Lightweight construction by innovative forming technologies’ In Proceedings of the Sixth International Conference on Technology of plasticity, Nuremberg, 1999, pp. 1119–1128.
3.
GiordanoP.ChiarmettaG., New rheocasting: a valid alternative to the traditional technologies for the production of automotive suspension parts (2004) (Stampal s.p.A, Borgaro T. Se (To)).
4.
AtkinsonH.McCarthyI.RidgwayK.LoweA., ‘An evaluation model for determining the business process benefits of thixoforming’Proc. IMechE, Part B: J. Engineering Manufacture214 (1) (2000): 11–23.
5.
ChoW. G.KangC. G., ‘An experimental study on thixoforging of semi-solid materials and solutions for avoiding defects’Proc. IMechE, Part B: J. Engineering Manufacture215 (9) (2001): 1217–1227 DOI: 10.1243/0954405011519286.
6.
JeonY. P.KangC. G., ‘Reheating process for thixoforging of metal matrix composites fabricated by induction heating and the mechanical stirring process’Proc. IMechE, Part B: J. Engineering Manufacture217 (10) (2003): 1383–1391 DOI: 10.1243/095440503322617153.
7.
KangC. G.JeonY. P., ‘Thixoforming process of a component with a non-circular type of metal matrix composite and its formability limitation’Proc. IMechE, Part B: J. Engineering Manufacture217 (9) (2003): 1265–1277 DOI: 10.1243/095440503322420197.
8.
JeonY. P.YounS. W.KangC. G., ‘Effects of viscosity control on microporosity in the fabrication process of aluminium foam material by a rheology forming process’Proc. IMechE, Part B: J. Engineering Manufacture218 (12) (2004): 1723–1734.
9.
KimT. W.KimH. H.BaeJ. W.LeeS. M.KangC. G., ‘Semi-solid die forging of Al6061 wrought aluminium alloy with electromagnetic stirring’Proc. IMechE, Part B: J. Engineering Manufacture222 (9) (2008): 1083–1095 DOI: 10.1243/09544054JEM1120.
10.
ReddyT. V. S.DwivediD. K.JainN. K., ‘Effect of stir-casting on the microstructure and adhesive wear characteristics of cast Al-Si-Cu alloy’Proc. IMechE, Part B: J. Engineering Manufacture223 (1) (2009): 083–087 DOI: 10.1243/09544054JEM1196.
11.
PuttgenW.HallstedtB.BleckW.LöfflerJ. F.UggowitzerP. J., ‘On the microstructure and properties of 100Cr6 steel processed in the semi-solid state’Acta Materialia55 (19) (2007): 6553–6560.
12.
LeeB. S.JooD. H.KimM. H., ‘Extrusion behavior of Al-Cu alloy in the semi-solid state’Mater. Sci. EngngA402 (2002): 170–176.
13.
VogelY.ZhangK., ‘The formation of rosette phase structural evolution during the reheating and semi-solid casting of AlSi7Mg alloy’J. Mater. Processing Technol.137 (2002): 195–200.
FanZ., ‘Semi-solid metal processing’ -solid metal processingProceedings of the 9th North American Manufacturing Research Conference, Pennsylvania, USA, 1981, pp. 140–144.
16.
HoffmannH.ToussaintA., ‘Strategies and future developments in the manufacturing process of light-weight car bodies’ In Proceedings of the Sixth International Conference on Technology of plasticity, Nuremberg, 1999, pp. 1129–1140.
17.
HagaT.SuzukiS.J., ‘Casting of aluminum alloy ingots for thixoforming using a cooling slope’J. Mater. Processing Technol.118 (1–3) (2001): 169–172.
18.
FindonM.ApelionD., Continuous rheoconversion process for semi-solid slurry production (MA: Metal Processing Institute2004): pp. 1–19.
19.
FanZ., ‘Semi-solid metal forming’Int. Mater. Rev.47 (2) (2002): 1–37.
20.
FanZ.JiS.LivG.ZhangE., Development of the rheo die casting process for Mg alloys and their components (Brunel University, Oxbridge: BCAST2004).
21.
PüttgenW.HallstedtB.BleckW.LöfflerJ.F.UggowitzerP.J., ‘On the microstructure and properties of 100Cr6 steel processed in the semi-solid state’Acta Materialia55 (19) (2007): 6553–6560.
22.
HaghayaghiR.ZoquiE. J.HalvaeeA., ‘An investigation on semi solids Al-7Si-0.3Mg alloy produced by mechanical stirring’J. Mater. Processing Technol.169 (2002): 382–387.
23.
BarabazonD.BrowneD. J.CarrA. J., ‘Mechanical stirr casting of aluminium alloy from the mushy state, process, microstructure and mechanical properties’Mater. Sci. EngngA236 (2002): 370–381.
BirolY., ‘Semi-solid processing of the primary aluminum die casting alloy A365’J. Alloys and Compounds473 (2002): 133–138.
26.
RiceC. S.MendesP. F., ‘Semi-solid slurry base die casting’J. Advd Mater. Processes159 (2002): 1–7.
27.
BaeJ. W.KimT. W.KangC. G., ‘Experimental investigation for rheology forming process of AL-%7 Si aluminum alloy with electromagnetic system’J. Mater. Processing Technol.191 (2002): 165–169.
28.
SalarfarS., ‘Influence of pouring conditions in the inklient plate process and reheating on the microstructure of the semisolid A356 alloy’ In Proceedings of the 8th International Conference on Semisolid processing of alloys and composites, University of Cyprus, Limassoal, 2004.
