Multi-pass large strain rolling of as-cast AZ31 magnesium alloy

作者：Fu, X. -S.; Yang, Q.; Sun, W.; Lu, S. -J.; Chen, G. -Q.; Zhou, W. -L.^*

来源：Materials Science and Technology, 2016, 32(18): 1869-1876.

DOI：10.1080/02670836.2016.1149658

• Multi-pass
• Dynamic recrystallisation
• Grain refinement
• Fracture mode
• Large strain rolling

As-cast AZ31 magnesium alloy subjected to multi-pass large strain rolling was investigated. A successive rolling process up to three passes was carried out at 370 degrees C with a pass reduction of 30%. Deformation microstructure characteristics prove that the dynamic recrystallisation (DRX) mode changed with the increase of rolling passes. In the first pass, DRX related to twinning played a dominant role. But in the third pass, DRX grains mainly appeared around the pre-existing grain boundaries. The ultimate strength and elongation of rolled sheets after three passes rolling are enhanced by 37 and 39%, respectively, compared to the as-cast alloy. Meanwhile, the tensile fracture mode was ductile fracture which was different from the ductile-brittle fracture of as-cast.

• 出版日期2016
• 单位大连理工大学