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gftian2008銀蟲 (小有名氣)
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[求助]
求助這段話主要含義
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annealing twinning is promoted by high velocity grain boundary migration, which can be induced by (1) the grain boundary curvature that decreases when grain size increases (2)dislocation density gradients that are produced by low deformation steps applied at high strain rates and can sustain high velocity grain boundary migration even when grain size increases. The driving force related to curvature depends also on grain size distributions, which have been identified as an important microstructure parameter. When grain boundaries migrate as a result of the driving force related to dislocation density gradients they can pass the primary precipitates despite the zener drag these precipitates exert on grain boundaries in the two-phase microstructures: those that have not undergone any supersolvus heat treatment. The dynamic recrystallization occurrence or nonoccurrence during deformation steps has also an important impact on microstructure evolution during subsequent sub- or supersolvus heat treatments. 這小段話主要說(shuō)明的是什么結(jié)論? 英文不錯(cuò)的發(fā)表下~~ |
銀蟲 (小有名氣)
木蟲 (正式寫手)
| 我覺得大意是:高的晶界遷移速度可以促進(jìn)退火孿晶形成。之后又說(shuō)了2個(gè)具體提高晶界遷移速率的情況:1. 晶粒變大晶界曲率減小,曲率也與晶粒尺寸分布有關(guān),至于曲率和驅(qū)動(dòng)力怎么聯(lián)系上的,文中沒說(shuō),應(yīng)該是眾所周知的一個(gè)規(guī)律吧(曲率減小,遷移速率增大??),我不清楚。 2.高的應(yīng)變速率可以維持高的晶界遷移速率;如果晶界遷移是由于位錯(cuò)密度梯度引起的,盡管在雙相組織中,晶界處有zener拖拽的發(fā)生,他們也可以通過主要的析出相。最后又說(shuō)了,動(dòng)態(tài)再結(jié)晶發(fā)生與否,對(duì)后續(xù)的熱處理組織也有重要影響。 |

鐵蟲 (初入文壇)

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