NANOCRYSTALLINE INTERMETALLIC COMPOUNDS - STRUCTURE AND MECHANICAL-PROPERTIES

被引：64
作者：
HAUBOLD, T
BOHN, R
BIRRINGER, R
GLEITER, H
机构：
[1] Universität des Saarlandes, 6600 Saarbrücken, FB 15 Werkstoffwissenschaften
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1992年 / 153卷 / 1-2期
关键词：
D O I：
10.1016/0921-5093(92)90270-B
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Nanocrystalline intermetallic compounds (Ni3Al, NiAl, TiAl) with crystallite sizes in the range 5-20 nm were prepared by means of an inert gas condensation technique. As-prepared nanocrystalline Ni3Al samples (24 at.% Al) exhibited no superlattice reflection in X-ray diffraction (XRD) and transmission electron microscopy. Ordering occurred during annealing starting at 400-degrees-C. In contrast, as-prepared nanocrystalline NiAl samples (50 at.% Al) were at least partially ordered. XRD spectra of as-prepared nanocrystalline TiAl samples (54 at.% Al) suggested that these samples consisted of a mixture of alpha(2)-Ti3Al and gamma-TiAl. Vickers hardness measurements showed that nanocrystalline samples were substantially harder than polycrystalline indicating that grain refinement caused strengthening. Hot pressing at temperatures up to 650-degrees-C under high vacuum conditions results in retarded grain growth compared with annealing.
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页码：679 / 683
页数：5
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