Dynamic Recrystallization and Grain Refinement in Extruded AZ31 Rod During Hot Torsion Deformation at 150°C
Dynamic Recrystallization and Grain Refinement in Extruded AZ31 Rod During Hot Torsion Deformation at 150°C
复制标题
150℃热扭转变形过程中AZ31挤压棒的动态再结晶和晶粒细化
DOI：
10.1007/s12540-018-0177-5
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发表时间：
2019-01-01
影响因子：
3.5
通讯作者：
He, Jiejun
中科院分区：
文献类型：
--
作者：
Chen, Hongbing;Song, Bo;He, Jiejun
研究了挤压AZ31棒材在150℃热扭转变形过程中的动态再结晶机制和组织演变。结果表明，在热扭转变形过程中发生了几种动态再结晶机制，包括非连续再结晶(DDRX)、连续再结晶(CDRX)和孪生诱发再结晶(TDRX)。随着应变的增加，CDRX成为主要的DRX机制，并有助于显著细化晶粒。扭转试样中由于梯度剪切应变产生的动态再结晶颗粒在横截面上的梯度分布。热扭转还会引起晶粒的c轴向挤压方向旋转。从低应变到高应变，再结晶组织表现出与变形组织相似的织构发展过程。并对其相关机制进行了探讨。
The dynamic recrystallization mechanism and microstructure evolution in an extruded AZ31 rod during hot torsion deformation at 150 degrees C were investigated. It indicated that several dynamic recrystallization mechanisms were initiated during hot torsion deformation, including discontinuous DRX (DDRX), continuous DRX (CDRX) and twinning induced DRX (TDRX). With increasing strain, CDRX became the dominant DRX mechanism and contributed to a remarkable refinement of grains. A gradient distribution of dynamic recrystallization grains on the cross section of samples generated due to the gradient shear strain in twisted samples. Hot torsion can also arouse the c-axis of grains to rotate towards the extrusion direction. From low strain to high strain, the recrystallized grains exhibited a similar texture development with the deformed grains. The relevant mechanisms were revealed.