Plastic deformation with reversible peak broadening in nanocrystalline nickel
Plastic deformation with reversible peak broadening in nanocrystalline nickel
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DOI：
10.1126/science.1095071
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发表时间：
2004-04-09
期刊：
影响因子：
56.9
通讯作者：
Schmitt, B
中科院分区：
文献类型：
--
作者：
Budrovic, Z;Van Swygenhoven, H;Schmitt, B
粗晶金属的塑性变形由位错介导的过程控制。这些过程导致残余位错网络的积累，产生不均匀的应变和不可逆的展宽的布拉格峰在X射线衍射。我们发现，在塑性变形的电沉积纳米晶镍，峰展宽是可逆的卸载后，因此，变形过程中不会建立一个残余位错网络。结果是在原位峰分离过程中获得的。使用瑞士光源进行分析。这种原位技术，基于众所周知的峰亲。le分析方法，可用于解决纳米结构材料的微观结构和力学性能之间的关系。
Plastic deformation in coarse-grained metals is governed by dislocation-mediated processes. These processes lead to the accumulation of a residual dislocation network, producing inhomogeneous strain and an irreversible broadening of the Bragg peaks in x-ray diffraction. We show that during plastic deformation of electrodeposited nanocrystalline nickel, the peak broadening is reversible upon unloading; hence, the deformation process does not build up a residual dislocation network. The results were obtained during in situ peak pro. le analysis using the Swiss Light Source. This in situ technique, based on well-known peak pro. le analysis methods, can be used to address the relationship between microstructure and mechanical properties in nanostructured materials.