用面内云纹和影像云纹相结合的方法，测量了高纯铝多晶大晶粒试样的细观变形场。观察记录了晶界滑错，晶粒刚体转动，三晶交点处变形场和应变场。由于晶界滑错在晶界两侧存在高剪应变差，晶粒内塑性变形由均匀到非均匀布，多晶体出现不稳定的塑性流动，直至破裂。 The mesoscopic deformation field of the high-purity aluminum polycrystalline large-grain sample was measured by a combination of in-plane moire and moire. Observed and recorded the grain boundary slip, the rotation of the grain rigid body, the deformation of the three-crystal point field and strain field. Because of the high shear strain on the two sides of the grain boundary, the intragranular plastic deformation is uniform to non-uniform, and the polycrystal appears unstable plastic flow until rupture.