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采用EBSD技术观察了不同变形量高纯镍三叉晶界的退火行为。结果表明,在退火初期,部分三叉晶界处形成尺寸较小的晶核且与基体呈孪晶关系。在进一步退火过程中,这些晶核中的大部分被其它快速长大的晶粒所吞并。轧制变形量为5%和10%时,长大晶粒是样品中的原有晶粒,它们通过形变诱发晶界迁移的方式快速长大,并在长大过程中激发出大量Σ3n(n=1,2,3…)等重位点阵晶界。变形量为20%时,长大晶粒是退火初期形成的尺寸较大的再结晶晶粒,它消耗周围形变组织并快速长大,在长大过程中也激发出大量Σ3n(n=1,2,3…)等重位点阵晶界。
The EBSD technique was used to observe the annealing behavior of high purity nickel trigeminal grain boundaries with different deformations. The results show that in the early stage of annealing, some small crystal nuclei are formed at some trigeminal boundaries and twins with the matrix. During further annealing, most of these nuclei are swallowed up by other rapidly growing grains. When the rolling deformation is 5% and 10%, the grown grains are the original grains in the sample. They grow rapidly by the way of grain-boundary-induced grain boundary deformation and induce large Σ3n (n = 1,2,3 ...) and other heavy bit lattice boundaries. When the amount of deformation is 20%, the grown grains are the recrystallized grains with larger size formed in the early stage of annealing, which consume the surrounding deformable microstructure and grow up rapidly, and a large amount of Σ3n (n = 1, 2,3 ...) and other heavy bit lattice boundaries.