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金相中的晶界分析 關(guān)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. 這看文獻時看到Σ3,不理解這個是什么意思,在金相圖片中怎么分析晶界,有哪位大俠可以幫幫我 |
» 搶金幣啦!回帖就可以得到:
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這是重位晶界,3代表相鄰晶粒的晶界上每三個原子就有一個原子同時屬于這兩個晶粒,即同時滿足他們的晶格排列,金相圖片沒法看出具體的大小角度晶界和重位晶界,這個需要做EBSD,然后就可以把所有類型晶界在圖上標(biāo)注出來了。 發(fā)自小木蟲Android客戶端 |
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