摘要
采用电子背散射衍射技术研究了厚度减缩量为5%小变形冷轧高纯镍三叉晶界在800℃的退火行为.结果表明:退火初期,在某些三叉晶界处、尤其是至少包含两条一般大角度晶界的三叉晶界处产生了再结晶晶核,这些晶核均与基体成<1 1 1>/60°取向差关系,关联界面均为非共格Σ3晶界;在进一步退火过程中,这些晶核中的大部分被其他快速长大的晶粒所吞并,此类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.分析认为,退火初期,小变形高纯镍三叉晶界处产生与基体成非共格Σ3界面关系的晶核只是起到了释放该处应变集中的作用,对进一步退火过程中晶界特征分布的演化没有本质影响.
Off-line in-situ electron back scatter diffraction（EBSD） was used to characterize the annealing behavior of triple junctions in a high purity（99.99 wt.%） nickel which had been cold rolled slightly（the thickness reduction was 5%）. The results showed that recrystallization nuclei were developed at some triple junctions during the early stage of annealing at 800℃. All such nuclei exhibit〈1 1 1〉/60° orientation relationships with the parent grains, and the bounded Σ3 boundaries are found to be incoherent ones. During further annealing, these nuclei are consumed by other growing grains, indicating that their presence is just a release of the strain concentration at the triple junctions and has no substantial effects on the evolution of grain boundary character distribution during annealing. The growing grains are usually those original grains and they are coarsened rapidly via a mechanism of so-called strain induced boundary migration by which high fraction Σ3 boundaries and large-sized Σ3 n（n=1, 2, 3…） boundary clusters are introduced.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2017年第11期1189-1197,共9页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:51171095,51471100)资助项目
关键词
高纯镍
三叉晶界
退火孪晶
晶粒长大
high purity nickel
triple junction
annealing twin
grain growth
