1st International Conference on Applied Engineering and Natural Sciences, Konya, Turkey, 1 - 03 November 2021, pp.498-501
Considering the constantly evolving technologies in today's world, many new industries are emerging, and new engineering materials are needed in these and emerging industries. The most common criteria are that the new materials needed in these areas are both less costly and light compared to others. With these emerging new criteria, existing traditional materials such as metal, polymer or ceramic have become unable to meet all the requirements in these areas. This has made metallic foams stand out over traditional materials due to their very low densities and interesting properties such as high impact energy absorption capabilities. In this study, a foam layer was produced by adding 1 wt % of pre-heat treated TiH2 powders to AA2024 alloy and as a second layer, AA2024 powders containing different wt % B4C was used, and functional graded foam layer composite materials were fabricated by powder metallurgy method. The average particle sizes of the aluminum and B4C powders used are 220 and 63 μm, respectively. AA2024 powders and 1 wt % of pre-heat treated TiH2 powders to form the aluminum-based foam layer were mechanically mixed. AA2024 alloy powders containing different wt % B4C were milled by mechanical alloying method at 400 rpm for 1 hour. Then the powder mixtures to form the foam layer and the composite layer were placed in the mold and pressed. Then the compressed powders sintered in an inert gas atmosphere in the furnace environment and then hot press was applied. Functionally graded aluminum-based foam layer composite material was fabricated by foaming in an oven environment with an inert gas atmosphere at 800℃ for 15 minutes. The microstructure of the produced functionally graded composite materials and the interface between the layers were examined with SEM and their hardness values were measured.