Effect of Titanium Addition on Characteristic of Al6061/ Al2O3 Reinforced Composites Produced by Stir Casting Process

[ABSTRACT]Al6061/Al2O3 reinforced composites have been successfully produced by stir casting process. The master alloy Al6061 as a matrix composites was prepared by melting at 800 ℃ and mixed with various of Al-5TiB from 0.02 wt-% to 0.15 wt-%, 0.025 wt-% Al-5Sr as modifier and 10 wt-% Mg as wetting agent respectively. The addition of Al-5Ti-1B on Al6061 is to strengthen the matrix phase and Al-15Sr is to bring the effect of matrix modification. The role of Al-5Ti-1B is to be grain refinement agent which mainly provides more nucleating sites and restricts the growth of grains and the role of Al-15Sr is to be a modifier of the morphology of the second-phase particles. The molten aluminium then flushed with argon to remove all the gas bubble from liquid aluminium, then stirred for 3 minutes to produce a perfect vortex flow, afterwards Al2O3 was poured and stirred again for 3 minutes. The composites produced then characterised both mechanical properties and microstructural analysis. The optimum mechanical properties of composite is obtained at 0.02 wt-% Ti addition with tensile strength of 204 MPa and elongation of 11.75 % at 0.09 wt-% Ti, while hardness is 50 HRB. These preferable properties are also supported by perceiving its microstructure. The role of Al-5Ti-1B is to be grain refinement agent which mainly provides more nucleating sites and restricts the growth of grains. It is obvious that the smaller-fragmented area of aluminium and finer morphology of the second phases contributed to increase mechanical properties

https://opac.ll.chiba-u.jp/da/curator/107861/

https://opac.ll.chiba-u.jp/da/curator/107861/ceresIntlSympo-24-P368.pdf

Chiba University. Center for Environmental Remote Sensing

千葉大学環境リモートセンシング研究センター

会議発表用資料

Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集

24

368

377

2016-11-21

publisher

環境リモートセンシング研究センター「CEReSシンポジウム資料集」