{10-12} twinning induced texture randomisation of friction stir processed AZ31B Mg alloy

ABSTRACT

Friction stir processing (FSP) with additional liquid nitrogen cooling was conducted on hot-rolled AZ31B Mg alloy. The FSP can simultaneously provide compress deformation perpendicular to the c-axis and tensile deformation parallel to the c-axis of close-packed hexagonal crystal cell. Massive {10-12} twins were activated under the two deformation modes, resulting in significantly reduced basal texture intensity. All six {10-12} twin variants were activated in the stir zone according to the Schmid factor criterion, and they provide a great contribution to basal texture randomisation. This study also provides a simple and effective method to remarkably reduce the basal texture intensity for deformed Mg alloy.

KEYWORDS:

• Metals and alloys
• friction stir processing
• twin
• texture
• microstructure

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was financial supported by National Natural Science Foundation of China (51805145), Fundamental Research Funds for the Central Universities of China (2018B22514) and Natural Science Foundation of Jiangsu Province (BK20160284).