EFFECT OF SECONDARY AGING of EN AC 43200 ALUMINUM ALLOY to MECHANICAL PROPERTIES

Authors : Bedri Baksan, Ibrahim Çelikyürek, Yusuf Kiliç

Pages : 16-20

View : 30 | Download : 13

Publication Date : 2020-06-30

Article Type : Research

Abstract :In this study EN-AC 43200 Aluminum alloy was subjected to secondary or interrupted aging following a T6 heat treatment. The 43200 alloy is a used widely in automotive industry for lowering weights of vehicles by substituting with ferrous alloys. This study covers the substitution of an automotive company’s part. 4320 Al alloy was melted under Argon atmosphere with an induction furnace, and cast into graphite molds. The samples were homogenized at 500 oC for 96 hours. Solutionizing treatment also done at 500 oC for 14 hours, following water quenching, T6 treatment was done at 250 oC for 2 hours ended with a water quench. Secondary aging trials were done at 100, 150 and 200 oC for 2, 4, 6 and 8 hours for each temperature range respectively. Tensile tests and microhardness tests were applied to for cast, T6 condition, and secondary aged samples. The samples were polished and observed for microstructure under optical microscope. Maximum strength value of 370 MPa, and hardness 113 Hv was obtained from samples aged secondarily at 150 oC for 6 hours.
Keywords : Aluminum alloys, Aging, Optical microscopy, Tensile Strength, Hardness