ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
In this study the effects of harder ultrafine Al2O3 particles on the mechanical milling ofductile Cu flakes (200mesh, 70μm) have been investigated. The small hard Al2O3 particle in themixture acted as an effective milling agent not only by inducing a drastic change of the Cumorphology from flattened flakes to equiaxed crystals but also by reducing the milling timerequired for a uniform dispersion of Al2O3 in the Cu matrix. This was more pronounced as theAl2O3 concentration increased. A critical concentration of the reinforcing Al2O3 required for a shapechange was observed at the range of 8 to 9wt. %. All the hard Al2O3 particles were uniformlyembedded in the ductile Cu matrix regardless of the concentration of Al2O3. By increasing themilling time, the weldment and fragmentation of the Cu flakes became significant and a uniformlydistributed equiaxed composite structure (13wt.% Al2O3) was obtained at above 70 min
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.119.179.pdf