Toscano D, Shaha SK, Behravesh B, Jahed H, Williams B, Su X (2018). Influence of low temperature forging on microstructure and low cycle fatigue behavior of cast AZ31B Mg alloy. In: Orlov D., Joshi V., Solanki K., Neelameggham N. (eds) Magnesium Technology 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham, 267-273
The effect of low temperature forging on the microstructure, quasi-static response and stress-controlled fatigue behavior of cast AZ31B Mg alloy was investigated.
The forging process was conducted at a temperature of 275 °C and a forging rate of 20 mm/s. Fully reversed stress controlled cyclic tests were performed on cast and forged material under total stress amplitudes of 120–160 MPa. Neckless type bimodal grain structure, an indication of incomplete dynamic recrystallization was observed in the forged microstructure in addition to the development of a sharp basal texture.
The obtained mechanical test results show that the forged material achieved significantly improved yield and tensile strengths along with longer fatigue life. The improvement in the quasi-static properties was attributed to the strengthening effect of partial grain refinement and activation of non-basal slip modes due to texture modification.