A study of recovery and primary recrystallization mechanisms in a Zr-2Hf alloy
A study of recovery and primary recrystallization mechanisms in a Zr-2Hf alloy
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DOI：
10.1016/j.actamat.2005.07.034
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发表时间：
2005-11
期刊：
影响因子：
9.4
通讯作者：
K. Zhu;D. Chaubet;B. Bacroix;F. Brisset
中科院分区：
文献类型：
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作者：
K. Zhu;D. Chaubet;B. Bacroix;F. Brisset
研究了Zr-2 Hf合金板材在室温下平面应变压缩变形后在选定温度下退火的再结晶行为。利用原位高压电子显微镜（HVEM）、电子背散射衍射（EBSD）和X射线衍射技术研究了合金的微观结构和晶体织构的演变。变形条件显示出由高度变形区和较小变形区组成的不均匀显微组织，并显示出主要的“倾斜”{0001}<$101 <$0 <$织构组分。原位HVEM研究为再结晶早期的组织演化机制提供了直接的实验证据：（1）位错胞重排为亚晶，（2）亚晶长大或合并形成晶核，（3）大角度晶界迁移导致晶核长大。EBSD和X射线衍射结果表明，在这几个阶段中，整体晶体学织构变化不大。随着退火温度的升高或退火时间的延长，新晶粒呈现出{0001}和{0001}两种织构成分，其中第一种织构成分在晶粒长大过程中消失。
The recrystallization of a Zr–2Hf alloy sheet deformed by plane strain compression at room temperature and then annealed at selected temperatures has been studied. The evolution of microstructure and crystallographic texture is investigated by in situ high voltage electron microscopy (HVEM), electron back-scattered diffraction (EBSD) and X-ray techniques. The deformed condition shows a heterogeneous microstructure, composed of highly and less deformed zones, and displays a main “tilted” {0001}〈101¯0〉 texture component. The in situ HVEM examinations provide direct experimental evidence of microstructure evolution mechanisms during early stages of recrystallization: (1) rearrangement of dislocation cells into subgrains, (2) formation of nuclei through growth or coalescence of subgrains, (3) growth of nuclei by high angle boundary migration. EBSD and X-ray show that there is little change of the global crystallographic texture during these stages. With increasing annealing temperature or time, the new grains display two texture components, {0001}〈101¯0〉 and {0001}〈112¯0〉, the first of which disappears during grain growth.