ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Cu-(2.5 or 5.0vol.%)Al2O3 nanocomposite balls and granules and Cu-(2.5vol.% or5.0vol.%)Pb alloy powder were prepared by high energy mechanical milling (HEMM) of mixturesof Cu and either Al2O3 or Pb powders. It was observed that with the increase of the content of Al2O3nanoparticles from 2.5vol.% to 5vol.% in the powder mixture, the product of HEMM changed fromhollow balls into granules and the average grain size and microhardness changed fromapproximately 130nm and 185HV to 100nm and 224HV, respectively. On the other hand, HEMMof Cu–(2.5 or 5.0vol.%) Pb powder mixtures under the same milling conditions failed to consolidatethe powder in-situ. Instead, it led to formation of nanostructured fine powders with an average grainsize of less than 50nm. Energy dispersive X-ray mapping showed homogenous distribution of Pb inthe powder particles in Cu–5vol.%Pb alloy powder produced after 12 hours of milling. With theincrease of the Pb content from 2.5 to 5.0 vol.%, the average microhardness of the Cu-Pb alloypowder particles increases from 270 to 285 HV. The mechanisms of the effects are briefly discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.143.pdf
