Heavily Deformed Metal Powders

WPPM applications have been reported in several recent publications concerning nanocrystalline powders and heavily deformed ceramic and metallic 

Ball-milled metal powders are among the best case studies to illustrate the potential of WPPM. The example shown in the following is taken from a more general work on the microstructure and lattice defects of ball milled metals.  

The material considered is an iron alloy (Fei.sMo) powder with the ot-Fe bcc structure. The metal powders were ground in a planetary ball mill (Fritsch Pulverisette 4) using tempered Cr steel balls (100Cr6) and jars (X210Crl2, 80 mL volume), with a 10 1 ratio between ball and powder weight. Different powder samples were ball milled in a sealed Ar atmosphere for increasing times, keeping aQ = 300 rpm rotation speed for the main disk and a ratio co/Q = —1.8 between jar revolution and main disk speed. 

Experimental data (O) profile fitting result (line) and difference between data and fit (residual, lower line). Insets Log scale plots and Miller indices of Bragg peaks. 

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