Abstract
The influence of the ageing temperature on the hardness, electrical conductivity, thermal diffusivity and thermal conductivity of the EN AW-7075 aluminium alloy was studied in this paper. After solution treating the alloy at 480 °C for 1 h and quenching it in ice water, the investigated alloy was characterized using Differential Thermal Analysis (DTA) in order to determine the optimal temperatures for the isochronal ageing treatments. Afterwards, isochronal ageing was conducted at the temperature range of 110 °C-250 °C for 30 min The hardness, electrical conductivity, thermal diffusivity, thermal conductivity and microstructural features were investigated during the ageing treatments. Hardness had a peak value after ageing at 150 °C, while other properties gradually increased with the ageing temperature. Microstructural investigation of the aged alloy by SEM-EDS revealed the existence of precipitated phases that appear homogenously distributed in the microstructure.
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
Reference33 articles.
1. ASTM E384-22 (2022). Standard Test Method for Microindentation Hardness of Materials. ASTM International, West Conshohocken, PA, USA.
2. Study on the Strengthening Mechanism of Two-Stage Double-Peaks Aging in 7075 Aluminum Alloy;Cai; Trans Indian Iinst Met 73 (1),2020
3. Microstructure evolution and tensile mechanical properties of thixoformed high performance Al-Zn-Mg-Cu alloy;Chen; Met Mater Int 21 (5),2015
4. Precipitation dependence of thermal properties for Al-Si-Mg-Cu-(Ti) alloy with various heat treatment;Choi; J Alloys Compd 647,2015
5. Cui, L., Liu, Z., Zhao, Xi., Tang, J., Liu, K., Liu, X., Qian, C. (2014). Precipitation of metastable phases and its effect on electrical resistivity of Al-0.96Mg2Si alloy during aging. Trans. Nonferrous. Met. Soc. China 24 (7), 2266-2274.
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献