| 查看: 207 | 回复: 0 | |||
| 当前主题已经存档。 | |||
monicajing铜虫 (小有名气)
|
[交流]
晶态尺寸效应：位错结构与硬度
|
||
|
Study on the indentation size effect in CaF2: Dislocation structure and hardness P. Sadrabadia, K. Durst, a, and M. Gökena aDepartment of Materials Science and Engineering, Lehrstuhl 1 – Allgemeine Werkstoffeigenschaften, Friedrich-Alexander, Universität Erlangen, Nürnberg, Martensstr. 5, D-91058 Erlangen, Germany Received 11 August 2008; revised 5 November 2008; accepted 5 November 2008. Available online 16 December 2008. Abstract In this study nanoindentations have been performed on a cleaved surface of a CaF2 single crystal and the dislocation structure has been investigated by the etch pit technique using atomic force microscopy. The deformation during indentation is first purely elastic until dislocations are created observable in a pop-in in the load displacement data, as well as in a dislocation rosette around the indentation. After pop-in a relatively high hardness is observed, which gradually decreases, until at 3 μm a nearly constant hardness is found. By using sequential polishing, etching and imaging, the dislocation structure underneath indentations with indentation depths of 300 nm and 110 nm (load: 5 mN, 1 mN) is quantified. The dislocation density and radial distribution of dislocation density depend on the indentation depth, where a smaller indentation depth leads to a higher dislocation density, which is in qualitative agreement with the observed increase in hardness. Keywords: Dislocations; Nanoindentation http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TW8-4V5F01Y-2-K&_cdi=5556&_user=2307902&_orig=browse&_coverDate=12%2F16%2F2008&_sk=999999999&view=c&wchp=dGLbVtb-zSkWb&md5=ef7962a030025b6f72273059011004ae&ie=/sdarticle.pdf |
回复此楼» 猜你喜欢
292求调剂
已经有17人回复
-
266分，求材料相关专业调剂
已经有15人回复
-
化工求调剂
已经有4人回复
-
283分材料与化工求调剂
已经有23人回复
-
320分，材料与化工专业，求调剂
已经有23人回复
-
293求调剂
已经有6人回复
-
334求调剂
已经有9人回复
-
esi高被引论文是不是能对中标有所加分和帮助呢
已经有6人回复
-
求调剂机会
已经有5人回复
-
0856，269分求调剂
已经有17人回复
