Effect of low-temperature pre-deformation on precipitation behavior and microstructure of a Zr-Sn-Nb-Fe-Cu-O alloy during fabrication
Effect of low-temperature pre-deformation on precipitation behavior and microstructure of a Zr-Sn-Nb-Fe-Cu-O alloy during fabrication
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DOI：
10.1080/00223131.2015.1059776
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发表时间：
2016-04-02
影响因子：
1.2
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Chen, Liangyu;Li, Jiuxiao;Zhang, Di
采用光学金相、扫描电镜、透射电镜和电子背散射衍射（EBSD）等方法研究了低温预变形对Zr-Sn-Nb-Fe-Cu-O合金显微组织演变的影响。结果表明，40%预变形试样（A组）热轧后可获得均匀细小的等轴晶组织，且第二相粒子（SPPs）分布均匀，而直接热轧试样（B组）热轧后不能获得均匀细小的等轴晶组织。A组中的初始SPPs直径也减小。两组之间的微观结构演变，包括分布和大小的SPPs，晶粒尺寸的矩阵，和纹理的显着差异进行观察。这种差异的原因是由于在预变形期间引入的缺陷（例如位错和界面）和在A组中形成的更优选的沉淀位点。预变形后的时效导致热轧过程中新的滑移系被激活，导致晶粒更彻底地细化。此外，SPPs的生长可用Lifshitz-Slyozov-瓦格纳模型解释。
The effect of low-temperature pre-deformation on the microstructural evolution of a Zr-Sn-Nb-Fe-Cu-O alloy was investigated by optical metallography, scanning electron microscope, transmission electron microscope, and electron backscattering diffraction (EBSD). It is found that a reasonably homogeneous and fine equiaxed grain structure with uniformly distributed second-phase particles (SPPs) can be obtained in 40% pre-deformed samples (Group A) but not in directly hot-rolled ones (Group B) after hot rolling. The initial SPPs diameter in Group A is also reduced. Noticeable differences in microstructural evolutions including the distribution and size of SPPs, grain size of matrix, and texture are observed between both groups. Reasons for such discrepancies are attributed to the defects (such as dislocations and interfaces) introduced during the pre-deformation and more preferred precipitation sites formed in Group A. The aging after the pre-deformation results in new slip systems activated during hot rolling, leading to more thorough refinement of grains. In addition, the growth of SPPs is interpreted by the Lifshitz-Slyozov-Wagner model.