中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 27 No. 6 June 2017 |
（1. Faculty of Engineering, Sabzevar University of New Technology, Sabzevar 9615131113, Iran;
2. Department of Materials Science and Metallurgical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran;
3. Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA;
4. Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran）
Abstract:Hot compression behavior of Al6061/Al2O3 nanocomposite was investigated in the temperature range of 350-500 °C and the strain rate range of 0.0005-0.5 s-1, in order to determine the optimum conditions for the hot workability of nanocomposite. The activation energy of 285 kJ/mol for the hot compression test is obtained by using hyperbolic sine function. By means of dynamic material model (DMM) and the corresponding processing map, safe zone for the hot workability of AA6061/Al2O3 is recognized at temperature of 450 °C and strain rate of 0.0005 s-1 and at temperature of 500 °C and the strain rate range of 0.0005-0.5 s-1, with the maximum power dissipation efficiency of 38%. Elongated and kinked grains are observed at 400 °C and strain rate of 0.5 s-1 due to the severe deformation.
Key words: nanocomposite; hot compression test; processing map; dynamic recrystallization; instability flow
