The effects of artificial aging treatment on the mechanical properties of alumunium 7075 imam prabowo, muhammad ichsan, mansyur abdul shaleh, naufal setiawan
Teknik Metalurgi, Universitas Pembangunan Nasional Veteran Yogyakarta
Abstract
The aerospace industry requires 7075 aluminium as a material for aircraft bodies, but it must have high strength and good corrosion resistance so that to obtain these properties, it is subjected to T6 aging heat treatment, which is carried out through Solution heat-treated, followed by aging at a higher temperature (around 160-190 C) to achieve maximum strength. To begin with, aluminium is cast to a high temperature of 550 C to dissolve the alloying elements in the matrix then rapid cooling is carried out and finally an aging process is carried out at a lower temperature, usually between 180 C. The aluminium was tested for tensile strength using ASTM E8/E8M standard and hardness using ASTM E384-17 standard.The 7075 T6 aluminium material has higher average tensile strength (UTS) and yield strength values than the 2075 T0 aluminium material, namely 442.053 MPa and 274.48 while the average UTS and yield strength values of 7075 T0 aluminium are 176.61 MPa and 61.27 MPa respectively. Elongation for 7075 T6 aluminium material is 18.02% and for 7075 T0 aluminium material, 19.27% is obtained for its elongation. In aluminium 7075 T0 obtained hardness test results of 54.66 HB, while in aluminium 7075 T6 obtained hardness test results of 148.27 HB. The value of tensile strength and yield strength in 7075 aluminium is higher than aluminium 7075 T0 as well as in aluminium 7075 T6.
