| Autor: |
Van Petegem, Steven, Segers, Danny, Dauwe, Charles, dalla Torre, Florian, Van Swygenhoven, Helena |
| Zdroj: |
Chemical Monthly / Monatshefte für Chemie; Jun2002, Vol. 133 Issue 6, p829-836, 8p |
| Abstrakt: |
Nanostructured Ni3Al was produced by the inert gas condensation and in situ compaction technique and characterized by means of high-resolution transmission electron microscopy (HRTEM), X-ray diffraction, and density measurements. The defect structure was investigated using positron annihilation lifetime spectroscopy (PALS). It is shown that in some samples besides the cubic also the martensitic phase can be present. The defect structure can be divided into three major components: vacancy-like defects in the grain boundaries and nano-voids with a size of 1 nm as seen with PALS, and large pores with sizes up to 8 nm as seen with HRTEM. Furthermore, it is shown that an increasing compaction temperature leads to significantly smaller nano-voids. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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