Influence of high energy milling on the crystal structure of the composite Al₂O₃ - Cu10%

Full text: The nanosized powders can be obtained by various methods , among them the high energy ball milling ( RBM ) is notable for allowing to obtain nanocrystalline composite powders in the solid state ( CULLITY , 1978) . During mechanical alloying , particle size powders are produced with manometry , mainly due to the processes of plastic deformation and fracture of the particles caused by high-energy impact of grinding bodies . This leads , among other effects , the comminution of coarse grain refinement as well as their crystalline (Meyers, Mishra and Benson, 2005) . The system Al₂O₃- Cu10 % behaves like a brittle - ductile component , wherein the flattening of the particles ductile and brittle fragmentation constituents occurs as a result of continuous collisions between the balls and powder . The objective of this study was to analyze the influence of high energy milling on the crystal structure of the composite Al₂O₃ - Cu10 % procedure . ground by 100 - Cu10 composite hours.The % Al₂O₃ was prepared by high energy ball milling , for a period of 100 hours and a speed of 400 rpm , with a sample collected at the times of 10 , 30 , 50 , 70 and 100 . The analyzes were performed on an X-ray diffractometer type (DRX -7000) from Shimadzu with Cu - Ka radiation , voltage 40KV , 30mA with current and scan range ( 2θ ) of 10 ° to 90 ° . according with the results , it was noticed that with increasing milling time , a decrease in intensity , broadening and shifting of the peaks , indicating that there was a refinement of these post 's collected 100 hours of grinding powder was obtained which structure more refined , however the 100 hours of grinding were not enough to amorfizar its structure . The MAE is a effective technical refinement , this composite. References [1] B.D. Cullity, Elements of x-ray Diffraction, 2 edição, Addison-Wesley publishing Company, canada,(1978)p.284-285. [2] MEYERS, M. A.; MISHRA, A.; BENSON, D. J., Mechanical properties of nanocrystalline materials, Progress in Materials Science, Univ. of California, USA, 2005. (author)