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shugq_2009新蟲 (小有名氣)
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[求助]
晶界的表示:“Σ3”怎么定義的
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| 就是看到文章上經(jīng)常出現(xiàn)“Σ3”之類的東西,像是一個(gè)通用定義,不知道在哪里可以看到具體的定義,還望能推薦本書看看,我自己找了幾本書都沒有講具體定義。非常感謝! |
晶體之家 | 塑性變形 |
新蟲 (初入文壇)
金蟲 (小有名氣)

木蟲 (正式寫手)
榮譽(yù)版主 (知名作家)
老和山猥瑣派九段
木蟲 (著名寫手)

新蟲 (小有名氣)
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不好意思,我不知道怎么上傳圖片,下面這個(gè)是wikipedia鏈接,里面有 http://en.wikipedia.org/wiki/Grain_boundary 我把其中一部分復(fù)制出來吧: In coincident site lattice (CSL) theory, the degree of fit (Σ) between the structures of the two grains is described by the reciprocal of the ratio of coincidence sites to the total number of sites. Thus a boundary with high Σ might be expected to have a higher energy than one with low Σ. Low-angle boundaries, where the distortion is entirely accommodated by dislocations, are Σ1. Some other low Σ boundaries have special properties especially when the boundary plane is one that contains a high density of coincident sites. Examples include coherent twin boundaries (Σ3) and high-mobility boundaries in FCC materials (Σ7). Deviations from the ideal CSL orientation may be accommodated by local atomic relaxation or the inclusion of dislocations into the boundary. |
新蟲 (小有名氣)
木蟲 (著名寫手)
|
當(dāng)年老一輩搞金屬和陶瓷的人很清楚,像我們這幫小一輩的人都不知道 |

新蟲 (小有名氣)
木蟲 (著名寫手)

新蟲 (小有名氣)
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