期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 405, 期 1-2, 页码 140-146出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.05.077
关键词
nanocomposite; mechanosynthesis; Cu-Al2O3; ODS Cu; milling
Nanocomposite powders of Cu-Al2O3 were produced by simple milling at room temperature in high-energy attritor mill using mixtures Of Cu, Cu2O and Al powder ingredients. The milled powders were then consolidated by hot pressing (HP) in high-density graphite die at 800, 850 and 900 degrees C under 50 MPa. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations showed that the consolidated materials were comprised of a mixture of nanocrystalline fcc-Cu and alpha-Al2O3 phase. The results of microstructural analysis also showed that Cu grains were of order of 20-30 nm with a bimodal size distribution of Al2O3 dispersoids: the coarse dispersoids are about 50-100 nm and fine ones about 10-20 nm. Average hardness number of the hot pressed materials consolidated at 850 degrees C increases from 70 to 103 HRB (Rockwell hardness number with increasing vol.% of Al2O3 (c) 2005 Elsevier B.V. All rights reserved.
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