A MATHEMATICAL AND EXPERIMENTAL DYNAMICAL PHASE-DIAGRAM FOR BALL-MILLED NI10ZR7

Based on a deeper mathematical treatment of the process taking place i n a planetary ball mill and experimental results concerning the ball-m illed end product of the Ni10Zr7 compound, we prove that neither the s hock frequency nor the shock energy separately governs the ball-milled end product as assumed previously. In other words, we prove that the ball-milled end product is only governed by the shock power. Based on these calculated and experimental results, a ball-milled dynamic phase diagram is mapped into three regions: a pure amorphous phase for medi um shock power values ranging from 4 to 8.2 W (corresponding to 0.4-0. 82 W g-1 for 10 g Ni10Zr7 powder mass); a mixture of crystalline and a morphous phases for low (less than 4 W) and high (greater than 8.2 W) shock power values.