Microstructure and wear characteristics of spray formed and hot extruded Al–Si alloys

Srivastava, V C and Ojha, S N (2004) Microstructure and wear characteristics of spray formed and hot extruded Al–Si alloys. Materials Science and Technology, 20 . pp. 1632-1638.

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The microstructural and wear properties of spray formed Al–6.5Si, Al–18Si and Al–18Si–5Fe–1.5Cu (wt-%) alloys have been investigated. The microstructure of the Al–6.5Si alloy exhibits the equiaxed grain morphology of the primary a-Al phase with eutectic Si at the grain boundaries. The size of the primary Si particulates in the Al–18Si alloy varied from 3 to 8 mm embedded in the eutectic matrix. Complex intermetallic phases such as b-Al5SiFe and d-Al4Si2Fe are observed to co-exist with primary Si in the spray formed Al–18Si–5Fe–1.5Cu alloy system. The periphery of the preforms invariably showed pre-solidified particles with a large amount of interstitial pores. An extrusion ratio of 6 : 1 for these alloys led to drastic porosity reduction and extensive breaking of second phase particles. These microstructural features showed distinct variation in the wear behaviour and the coefficient of friction of the alloys. The Al–18Si–5Fe–1.5Cu alloy shows better wear resistance compared with the other two alloys, particularly at higher loads. The coefficient of friction shows a dependence upon the applied load. However, this becomes steady at higher loads. The wear behaviour of these alloys is discussed in light of the morphology of debris particles as well as that of the worn surfaces.

Item Type:Article
Official URL/DOI:http://10.1179/026708304X11305
Uncontrolled Keywords:Aluminium silicon alloys, Microstructure, Wear, Spray forming, Hot extrusion
Divisions:Metal Extraction and Forming
ID Code:1494
Deposited By:Dr. V.C. Srivastava
Deposited On:26 Aug 2010 14:19
Last Modified:17 Feb 2012 16:13
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