Pre-treated Si powder (Sip) and 6061Al powder were used to fabricate high-fraction Sip/6061Al composites via pressureless sintering, and the effects of the Sip content and the sintering temperature on the microstructures and properties of the composites were studied. The results show that in the composites, there exist MgAl2O4 nanocrystalline particles, and the Si phase varied from a discontinuous particulate state to a semi-continuous skeleton state as the Si content increased from 30 to 50 wt-%. Densities, bending strengths, hardness, and thermal conductivities of the composites all increased initially and then decreased with the sintering temperature. The 680°C sintered 30 wt-% Sip/6061Al composites and the 700°C sintered 50 wt-% Sip/6061Al composites have the optimal mechanical and thermophysical properties.
WangF, XiongB, ZhangY, Microstructure, thermophysical and mechanical properties of spray-deposited Si-30Al alloy for electronic packaging application. Mater Character. 2008;59:1455–1457. doi: 10.1016/j.matchar.2008.01.012
2.
CaiZY, ZhangC, WangRC, Preparation of Al-Si alloys by a rapid solidification and powder metallurgy route. Mater Des. 2015;87:996–1002. doi: 10.1016/j.matdes.2015.08.106
3.
ChenZH, TengJ, YanHG, Continuous compaction of spray deposited At-20 wt-%Si/SiCP composites via wedge pressing technique. Mater Sci Technol. 2007;23:285–289. doi: 10.1179/174328407X158695
4.
LiuN.Song, Jie JCXY,, Preparation of Al-Mn and Al-Si alloys cladding hollow billets by horizontal electromagnetic continuous casting. Mater Sci Technol. 2014;30:471–475. doi: 10.1179/1743284712Y.0000000130
5.
AbdullahY, DaudAR, HarunM, Investigation of thermal properties of Al-Si matrix reinforced fine SiCp composites. Mater Sci Technol. 2010;26:1518–1520. doi: 10.1179/174328409X433796
6.
JacobsonDM, OgilvyAJW.Spray-deposited Al-Si (Osprey CE) alloys and their properties. Materialwiss Werkst. 2003;34:381–384. doi: 10.1002/mawe.200390079
7.
ChenY, ChungDDL.Silicon-aluminium network composites fabricated by liquid metal infiltration. J Mater Sci. 1994;29:6069–6075. doi: 10.1007/BF00354543
8.
TorralbaJM.Costa CED, Velasco F. P/M aluminum matrix composites: an overview. J Mater Proc Technol. 2003;133:203–206.
9.
MiG, LiC, WangK, Microstructure and properties of 50Si50Al alloy fabricated by HPS process using overspray powders. Mater Res Innov. 2013;17(Suppl):182–185. doi: 10.1179/1432891713Z.000000000212
10.
YuJH, WangCB, ShenQ, Preparation and properties of Sip/Al composites by spark plasma sintering. Mater Des. 2012;41:198–202. doi: 10.1016/j.matdes.2012.05.007
11.
MujahidM, FriskaI.Influence of mechanical milling on the SiC particulate size in an Al-SiC composite. J Mater Eng Perform. 2005;14:69–74. doi: 10.1361/10599490522284
12.
RandallM.A model for the thermal properties of liquid phase sintered composites. Metall Trans. 1993;24A:1745–1752.
13.
YanYW, GengL.Effects of particle size on the thermal expansion behavior of SiCp/Al composites. J Mater Sci. 2007;42:6433–6438. doi: 10.1007/s10853-006-1200-7
14.
YouseffiM, ShowaiterN, MartynMT.Sintering and mechanical properties of prealloyed 6061 Al powder with and without common lubricants and sintering aids. Powder Metall. 2006;49:86–95. doi: 10.1179/174329006X94663
15.
ShowaiterN, YouseffiM.Compaction, sintering and mechanical properties of elemental 6061 Al powder with and without sintering aids. Mater Des. 2008;29:752–762. doi: 10.1016/j.matdes.2007.01.027
16.
WangRM, SurappaMK, TaoCH, Microstructure and interface structure studies of SiCp-reinforced Al (6061) metal-matrix composites. Mater Sci Eng A. 1998;254:219–226. doi: 10.1016/S0921-5093(98)00686-8
17.
LumleyRN, SercombeTB, SchafferGM.Surface oxide and the role of magnesium during the sintering of aluminum. Metall Mater Trans A. 1999;30:457–463. doi: 10.1007/s11661-999-0335-y
18.
ZulfiaA, HandRJ.Role of Mg and Mg + Si as external dopants in production of pure Al-SiC metal matrix composites by pressureless infiltration. Mater Sci Technol. 2000;16:867–872. doi: 10.1179/026708300101508586
19.
YuW, YuJK.Silicon dissolution and interfacial characteristics in Si/Al composites fabricated by gas pressure infiltration. Mater Chem Phys. 2013;139:783–788. doi: 10.1016/j.matchemphys.2013.02.032
20.
MaoXZ, HongY, WangBH, Fabrication, microstructures and properties of 50 vol.-% SiCp/6061Al composites via a pressureless sintering technique. Powder Metall. [cited 2017 Aug 17]:[9 p.].
SubrataKG, ParthaS, ShyamK.Influence of size and volume fraction of SiC particulates on properties of ex situ reinforced Al-4.5Cu-3Mg metal matrix composite prepared by direct metal laser sintering process. Mater Sci Eng A. 2010;527:4694–4701. doi: 10.1016/j.msea.2010.03.108
23.
HasselmanDPH, DonaldsonKY, GeigerAL.Effect of reinforcement particle size on the thermal conductivity of a particulate-silicon carbide-reinforced aluminum matrix composite. J Am Ceram Soc. 1992;12:420–423.
24.
NamTH, RequenaG, DegischerP.Thermal expansion behaviour of aluminum matrix composites with densely packed SiC particles. Comp A. 2008;39:856–865. doi: 10.1016/j.compositesa.2008.01.011
25.
YuK, LiSJ, ChenLS, Microstructure characterization and thermal properties of hypereutectic Si-Al alloy for electronic packaging applications. Trans Nonferrous Metals Soc China. 2012;22:1412–1417. doi: 10.1016/S1003-6326(11)61334-4
