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六角结构的Mg-0.6WT％Zr合金经热锻后,TEM观察到很多呈六边形网络状的小角度扭转晶界分布于{0001}基面上(图1)。为了分析这种网络的性质,分别用(?)作为操作失量成像,在原区域中分别只显示一维方向的平行条纹,而且条纹的走向与上述操作失量平行(图2)。显然,这种网络不是由位错象构成。选用大的相机常数并尽量使第二聚光镜散焦后,衍射斑可分辨为两个间距极小(△g)的等强度斑点。且在距中心斑点△g处有双衍射斑点D(图3)。经分析证实:它是由于小角度扭转晶界上、下晶体间有一个很小的扭转角,在电子衍射时产
After hot forging of the hexagonal Mg-0.6WT% Zr alloy, many hexagonal network-like small-angle twisted grain boundaries were observed on the {0001} basal plane by TEM (Fig. 1). In order to analyze the nature of this network, we use (?) As the operational loss imaging, showing only one-dimensional parallel stripes in the original region, and the stripe direction parallel with the above operational loss (Figure 2). Obviously, this network is not composed of dislocation images. After selecting a large camera constant and defocusing the second condenser as much as possible, the diffraction spot can be resolved into two iso-intensity spots with a minimum of separation (Δg). And has a double diffraction spot D at the center spot Δg (FIG. 3). The analysis confirmed: it is due to a small angle to reverse the grain boundary, the lower crystal between a small torsion angle, produced in the electron diffraction