Anisotropy influence on the mechanical and microstructural characteristics of AZ31B sheets deformed at room and elevated temperature

Abstract

The objective of the present study is to evaluate the anisotropy influence on the mechanical and microstructural characteristics of AZ31B magnesium alloy sheets deformed at room and elevated temperature. To this aim, uniaxial tensile tests were carried out along the rolling, transverse and diagonal direction in the range of temperatures from room temperature to 300°C at 0.1 s-1. The Lankford coefficients, ultimate tensile strength, diffuse necking strain and fracture strain values were evaluated as a function of the testing temperature and specimen orientation. Furthermore, microstructural features were analysed as well as micro-hardness was measured for each testing condition to assess the post-deformation characteristics.

Anisotropic fracture behavior of AZ31 magnesium alloy sheets as a function of the stress state and temperature

“…Along with different stress triaxiality states, tests were performed at different temperatures, namely 25 °C, 100 °C and 300 °C. It is worth underlining that the testing temperatures of 100 °C and 300 °C were selected in order to appreciate the presence of twinning and recrystallization, respectively [15] . The strain rate was set equal to 0.1 s − 1 and kept fixed for all the tests.…”

“…The numerical simulations were carried out as implicit analysis using the Ls_Dyna TM code version R9.1.0 (Ls_Prepost V4.7) with shell elements. The hardening law was calibrated on the basis of the tensile tests conducted on the smooth specimens at varying temperature [15] . The anisotropic yield criterion Barlat-Lian 1989 [20] was adopted and the related anisotropy coefficients at varying temperature were employed to simulate the anisotropy characteristics of the AZ31 sheets.…”