Nucleation in Recrystallization
Nucleation in Recrystallization
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再结晶成核
DOI：
10.4028/www.scientific.net/msf.467-470.107
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Humphreys
中科院分区：
文献类型：
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作者：
J. Humphreys
综述了变形和退火金属中再结晶的形核过程。其主要机制被认为涉及亚晶粒的生长的低角度边界（LAGB）迁移的取向梯度或应变诱导的边界迁移（SIBM）的现有边界。虽然这些机制是相当好的理解，位错恢复机制的细节，通常需要迁移发生之前，特别是在金属中的恢复是缓慢的，是知之甚少。完整的实验研究的成核事件需要一个3-D原位技术，将解决位错，这是目前不可用的。虽然已经报道了取向不在变形结构中的再结晶晶粒，但还没有实质性的证据或理论表明通过退火孪晶以外的机制产生新的取向。它的结论是，需要进一步了解变形状态之前，可以制定和验证适当的模型的成核。
The nucleation of recrystallization in deformed and annealed metals is reviewed. The main mechanisms are thought to involve the growth of subgrains by low angle boundary (LAGB) migration in an orientation gradient or the strain induced boundary migration (SIBM) of existing boundaries. Although these mechanisms are reasonably well understood, the details of the dislocation recovery mechanisms which are often required before migration can occur, particularly in metals in which recovery is slow, are poorly understood. Complete experimental investigation of the nucleation event requires a 3-d in-situ technique which will resolve dislocations, and this is not currently available. Although recrystallized grains of orientations not in the deformed structure have been reported, there is as yet no substantial evidence or theory to suggest the creation of new orientations by mechanisms other than annealing twinning. It is concluded that further understanding of the deformed state is required before adequate models of nucleation can be formulated and verified.