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[交流] 金相中的晶界分析关于小角度晶界

According to the coincidence-site lattice(CSL) misorientation angle between adjacent grains, the misorientation
angle with（0<q<15） and （q 大于15） are referred as low angle grain boundaries (LAGBs or S1 boundaries) and high angle
grain boundaries (HAGBs), respectively. For HAGBs, the grain boundaries with a low CSL value (1<S 29) are named as ‘‘special’’
grain boundaries [45], whilst others known as random HAGBs. It is reported that the low-CSL boundaries at adjacent grains are the
relatively coherent interfaces, which contain few crystalline defects.Besides, due to their potentials for structural order in the
boundary plane, a high concentration of annealing twins(Σ3n; n ：1; 2; 3) can improve the hot corrosion resistance
and fatigue resistance of nickel-based superalloys . Especially,coherent annealing twin boundaries with Σ3 are the attractive features in polycrystalline alloys, due to their lowest grain boundary energies among low-CSL boundaries. Furthermore,Σ3 boundaries have an indirect promoting role on the formations of new Σ3, Σ9, or Σ27 boundaries by means of Σ3 regeneration mechanism. In recent years, considerable researches have
been carried out on the formation of annealing twins of various superalloys.
这看文献时看到Σ3，不理解这个是什么意思，在金相图片中怎么分析晶界，有哪位大侠可以帮帮我

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