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同步辐射连续X射线谱微衍射技术被应用于原位研究AZ31(Mg-3Al-1Zn)薄板单向拉伸过程中的形变孪生,对孪晶在64~73 MPa载荷条件下的形态和生长进行原位分析。在先进光源中心(ALS)的12.3.2光束线采集的X射线衍射数据被用来表征面积为396μm×200μm的关注区域。该实验装置和具有深度分辨能力的X射线显微术可在亚微米尺度上确定晶粒内位置与取向联系。一系列基体晶粒按照晶体取向分类来研究孪生行为。结果展示了相同晶粒内多重孪生的孪生变体选择、局域取向差波动及镶嵌块扩展。随着载荷增加,沿孪晶迹线方向的取向差波动持续增加,其原因归结为几何必需位错的积累。
Synchrotron radiation X-ray microanalysis technique was used to study the in-situ deformation twinning of AZ31 (Mg-3Al-1Zn) sheet during uniaxial tensioning. The morphology and growth of twin under 64 ~ 73 MPa loading were studied In situ analysis. X-ray diffraction data acquired at the 12.3.2 beamline of an Advanced Light Source Center (ALS) was used to characterize the area of interest with an area of 396 μm × 200 μm. The experimental setup and depth-resolving X-ray microscopy determine the intragranular location and orientation at the submicron scale. A series of matrix grains are classified according to crystal orientation to study twin behavior. The results show the twin variation of multiple twins within the same grain, local differences in orientation and mosaic block extension. As the load increases, the orientation difference along the twin traces continues to increase, which is attributed to the accumulation of geometrically necessary dislocations.