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金相中的晶界分析 关于小角度晶界
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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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这是重位晶界，3代表相邻晶粒的晶界上每三个原子就有一个原子同时属于这两个晶粒，即同时满足他们的晶格排列，金相图片没法看出具体的大小角度晶界和重位晶界，这个需要做EBSD，然后就可以把所有类型晶界在图上标注出来了。 发自小木虫Android客户端 |
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2018-02-01 11:39
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