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利用EBSD技术研究了样品取向对AZ31镁合金静态再结晶行为的影响.采用了沿板材法向切取的试样(0°试样)和沿板材横向切取的试样(90°试样)2种取向的样品,在150℃进行15%单轴压缩变形,然后在275℃保温不同时间进行退火实验.结果表明,0°试样15%单轴压缩变形内的变形机制以滑移为主;90°试样15%单轴压缩变形内的变形机制先以拉伸孪生为主,然后以滑移为主;由于变形机制的差异,相同压缩应变下90°试样比0°试样形变储存能要小.与0°试样相比,90°试样相同退火参数下静态再结晶开始及结束时间都被推迟.随着再结晶过程的进行,90°试样和0°试样2°—4°小角晶界含量均降低,均在30°取向差角处产生峰值;绝大多数再结晶晶粒优先在原始晶界处形核,少数再结晶晶粒在拉伸孪晶内部形核.
The effect of sample orientation on the static recrystallization of AZ31 magnesium alloy was studied by using EBSD technique.The samples (0 ° sample) cut along the normal direction of the plate and two samples (90 ° sample) cut along the transverse direction of the plate Oriented specimens were subjected to 15% uniaxial compression at 150 ° C and then annealed at 275 ° C for different periods of time.The results show that the deformation mechanism in 15% uniaxial compression deformation of 0 ° specimen is mainly slippery; ° The deformation mechanism of 15% uniaxial compression deformation is mainly tensile twins first, and then slip mainly; due to the difference of deformation mechanism, deformation of 90 ° specimens under the same compressive strain is higher than that of 0 ° specimens Is smaller than that of 0 ° sample.It is postponed that the static recrystallization start time and end time of 90 ° sample are delayed with the same annealing parameters.With the recrystallization process, 90 ° sample and 0 ° sample 2 ° - 4 ° small angle grain boundaries are reduced, all in the 30 ° angle difference at the peak; most of the recrystallized grains preferentially nucleate at the original grain boundaries, a small number of recrystallized grains in the tensile twins within the nucleus.