Deformation processing of massive nanostructured materials

被引:2
作者
Wilde, Gerhard
Dinda, Guru Prasad
Roesner, Harald
机构
[1] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany
[2] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany
关键词
nanocrystal; severe plastic deformation; nanostructured material; geometrical phase analysis; thermal stability;
D O I
10.3139/146.101474
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Deformation processing of initially polycrystalline material can lead to ultrafine-grained or even to nanocrystalline material, depending on the applied deformation route. In addition to different grain sizes, materials processed by different deformation methods also display different thermal stabilities. In order to analyze the impact of defects - particularly dislocations - near the grain boundaries, pure Pd and pure Ni have been processed sequentially by different methods. Transmission electron microscopy investigations at high resolution were conducted to characterize the microstructures of the materials. In addition, geometrical phase analysis was used to locate defects and visualize their strain fields. The results indicate that the presence of a high dislocation density at the grain boundaries increases the stability of the nanocrystalline structure against coarsening.
引用
收藏
页码:299 / 306
页数:8
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