中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 3 March 2013 |
（1. Key Laboratory for Liquid-Solid Evolution and Processing of Materials, Ministry of Education,
School of Materials Science and Engineering Shandong University, Ji’nan 250061, China;
2. Light Metals Group, Korea Institute of Materials Science, Changwon 642831, Korea）
Abstract:The deformation behaviors of a new quaternary Mg-6Zn-1.5Cu-0.5Zr alloy at temperatures of 523-673 K and strain rates of 0.001-1 s-1 were studied by compressive tests using a Gleeble 3800 thermal-simulator. The results show that the flow stress increases as the deformation temperature decreases or as the strain rate increases. A strain-dependent constitutive equation and a feed-forward back-propagation artificial neural network were used to predict flow stress, which showed good agreement with experimental data. The processing map suggests that the domains of 643-673 K and 0.001-0.01 s-1 are corresponded to optimum conditions for hot working of the T4-treated Mg-6Zn-1.5Cu-0.5Zr alloy.
Key words: Mg alloy; Cu addition; flow stress; deformation behavior; constitutive equation; artificial neural network; processing map
