And there is twin dynamic recrystallization in the HERT process.The twins and secondary twins can hinder the spreading of cracks.

• 变形过程发生了孪生动态再结晶，孪晶和二次孪晶的产生可以阻碍裂纹扩展，镁在基面滑移与孪生的交互作用下形成微晶和孪晶位错；