This work studied the semisolid (SSM) Al-A380 alloy formed by mechanical stirring under the circumstances of controlled atmosphere with argon gas. The A380 aluminium alloy produced due to this process can be used instead of the forging processes or die casting with better mechanical properties. In this paper, first, the effects of the solid fraction, the stirring speed and the mold temperature on the hardness and microstructure are studied using a mechanical stirrer. Then some tests such as XRD and ultrasonic test are done to investigate the effect of using the controlled atmosphere system. By optimizing the forming parameters and with the breaking of primary a phase dendrites, the microstructure will be changed to the spherical form, therefore the mechanical properties will be improved. The results showed that the hardness of the billets has increased significantly due to the uniform grains distribution at the condition of 580 ℃ stirring temperature, 300 r/min stirring speed and mold temperature of 100 ℃. Also, the process properly optimized with the controlled atmosphere. In this condition, the results illustrated that the mechanical properties of the alloy increased around 30%.
FlemingsMC. Behavior of metal alloys in the semisolid state. Metall Mater Trans B1991; 22: 269–293.
2.
KiuchiMSugiyamaS. A new process to manufacture semi-solid alloys. ISIJ Int1995; 35: 790–797.
3.
SukumaranKPaiBCChakrabortyM. The effect of isothermal mechanical stirring on an Al–Si alloy in the semisolid condition. Mater Sci Eng A2004; 369: 275–283.
4.
NourouziSBakhshi-JuybariMHosseinipourSJ. Effect of temperature on the microstructure of semi-solid casting in cooling slope method. Aerosp Mech J2013; 9: 55–63.
5.
MakiSHaradaYMoriKIet al.Application of resistance heating technique to mushy state forming of aluminium alloy. J Mater Process Technol2002; 125: 477–482.
6.
LeeBSJooDHKimMH. Extrusion behavior of Al-Cu alloys in the semisolid state. Mater Sci Eng A2005; 402: 170–176.
7.
ZhouBFYanH. Study on semi-solid magnesium alloy produced by mechanical stirring. Adv Mat Res2011; 146: 1723–1728.
8.
Botkan M, Nourouzi S and Kolahdooz A. Effect of isothermal stirring parameters on microstructure of AI-A356 alloy. In: 14th International Conference on Metal Forming, Krakow, Poland, 16–19 September 2012, Code 104473, pp.775–778. Steel Research International.
9.
ZhangYZhangKLiuGet al.The formation of rosette α phase, structural evolution during the reheating and semi-solid casting of AlSi7Mg alloy. J Mater Process Technol2003; 137: 195–200.
10.
SumitomoTSt JohnDHSteinbergT. The shear behaviour of partially solidified Al–Si–Cu alloys. Mater Sci Eng A2000; 289: 18–29.
11.
MullisAM. Growth induced dendritic bending and rosette formation during solidification in a shearing flow. Acta Mater1999; 47: 1783–1789.
12.
GuptaPKumarDParkashOet al.Hardness and wear behavior of CoO doped Fe-Al2O3 metal matrix composite (MMC) synthesized via powder metallurgy (P/M) technique. Adv Mat Res2012; 585: 584–589.
13.
Garg P, Gupta P, Kumar D, et al. Structural and mechanical properties of graphene reinforced aluminum matrix composites. Varanasi: Department of Ceramic Engineering, Indian Institute of Technology (Banaras Hindu University), vol. 7, 2016, pp.1461–1473.
14.
DubeyAKhoslaPSinghHKet al.A review on role of processing parameter in determining properties of silicon carbide reinforced metal matrix nanocomposites. J Appl Sci Eng2016; 19: 303–312.
15.
GuptaPKumarDParkashOet al.Structural and mechanical behaviour of 5% Al2O3-reinforced Fe metal matrix composites (MMCs) produced by powder metallurgy (P/M) route. Bull Mater Sci2013; 36: 859–868.
16.
TaghaviFSaghafianHKharraziYH. Study on the ability of mechanical vibration for the production of thixotropic microstructure in A356 aluminum alloy. Mater Des2009; 30: 115–121.
17.
NingZLWangHSunJF. Deformation behavior of semisolid A356 alloy prepared by low temperature pouring. Mater Manuf Process2010; 25: 648–653.
18.
TaghaviFGhassemiA. Study on the effects of the length and angle of inclined plate on the thixotropic microstructure of A356 aluminum alloy. Mater Des2009; 30: 1762–1767.
19.
KundNKDuttaP. Numerical simulation of solidification of liquid aluminum alloy flowing on cooling slope. Trans Nonfer Metal Soc Chin2010; 20: s898–s905.
20.
NourouziSGhavamodiniSMBaseriHet al.Microstructure evolution of A356 aluminum alloy produced by cooling slope method. Adv Mat Res2012; 402: 272–276.
21.
KolahdoozAAminianS. Effects of important parameters in the production of Al-A356 alloy by semi-solid forming process. J Mater Sci Technol2018. https://doi.org/10.1016/j.jmrt.2017.11.005.
22.
NourouziSBaseriHKolahdoozAet al.Optimization of semi-solid metal processing of A356 aluminum alloy. J Mech Sci Technol2013; 27: 3869–3874.
23.
KolahdoozANourouziSBakhshiMet al.Investigation of the controlled atmosphere of semisolid metal processing of A356 aluminium alloy. J Mech Sci Technol2014; 28: 4267–4274.
24.
KolahdoozANourouziSBakhshi JooybariMet al.Experimental investigation of the effect of temperature in semisolid casting using cooling slope method. Proc IMechE, Part E: J Process Mechanical Engineering2016; 230: 316–325.
25.
KolahdoozANourouziSJooybariMBet al.Experimental investigation of thixoforging parameters effects on the microstructure and mechanical properties of the helical gearbox cap. J Mech Sci Technol2014; 28: 4257–4257.
26.
KazemiANourouziSKolahdoozAet al.Experimental investigation of thixoforging process on microstructure and mechanical properties of the centrifugal pump flange. J Mech Sci Technol2015; 29: 2957–2965.
27.
HaghayeghiRZoquiEJHalvaeeAet al.An investigation on semi-solid Al–7Si–0.3 Mg alloy produced by mechanical stirring. Journal of materials processing technology2005; 169: 382–387.
28.
NourouziSKolahdoozABotkanM. Behavior of A356 Alloy in semi-solid state produced by mechanical stirring. Adv Mat Res2012; 402: 331–336.
29.
KumarUJGuptaPJhaAKet al.Closed die deformation behavior of cylindrical iron–alumina metal matrix composites during cold sinter forging. J Inst Eng (India) D2016; 97: 135–151.
30.
GuptaPKumarDParkashOet al.Effect of sintering on wear characteristics of Fe-Al2O3 metal matrix composites. Proc IMechE, Part J: J Engineering Tribology2014; 228: 362–368.
