George ARGHIR

22-35 CARACTERIZAREA PRIN DIFRACȚIE CU RAZE X A UNOR PULBERI Cr- Fe-Al ȘI Cr-Fe-Co ALIATE MECANIC

Această intrare a fost publicată în 2012 Volumul 22 și etichetată Dan Anastasiu POP George ARGHIR la de

Using milled Fe-Cr powder and introducing on these powders a small
amount of Co or Al powder, nanostructure alloys were obtained. Using X-ray
diffraction it was determined the crystallite size and the internal stress.
Williamson-Hall method was used for the crystallite size calculations. The
measurements were performed on a DRON 3 diffract meter and the data
acquisitions were performed using MATMEC IV software.
Cuvinte cheie: pulberi metalice, mori planetare, aliere mecanică
Keywords: metal powders, planetary mills, mechanical alloying

35 CARACTERIZAREA PRIN DIFRACȚIE CU RAZE X A

22-34 ASPECTE STRUCTURALE ALE AMESTECURILOR PULVERULENTE Fe60Ni40, Fe50Ni50, Fe40Ni60 SUPUSE ALIERII MECANICE

Această intrare a fost publicată în 2012 Volumul 22 și etichetată George ARGHIR Ioan PETEAN Ioan TĂUT la de

The mechanical alloying experiments were performed on a high
energy planetary ball mill. Four vials were used for powder mixtures milling.
The milling charge contains 46 steel balls having 15 mm average diameter and
100 g powder mixture. It corresponds to a charge level of ½ of the vial volume
and represents a 8:1 ball/powder ratio. The powder mixtures: Fe60Ni40, Fe50Ni50,
Fe40Ni60, were milled for 1, 2, 4, 8, 16, 32, 48 şi 64 hours. At each milling time
were taken samples for analysis (5 grams). The X-ray diffraction analysis
reveals that after 8 hours of milling the Fe peaks disappear and the Ni phase is
featured in all powder mass. The calculated crystal parameters prove that the
mechanical alloying process induces Ni structure for all powder mixtures after 8
hours of milling resulting a substitution solid solution where some Ni atoms
were replaced with Fe ones.
Cuvinte cheie: aliere mecanică, pulberi Fe Ni, moara planetară
Keywords: mechanical alloying, powder Fe Ni, planetary mill

34 ASPECTE STRUCTURALE ALE AMESTECURILOR