Characteristics of spherical particles on copper powder and changing sizes were studied in a ball mill under various experimental conditions, such as different ball diameters, high rotation speeds, and milling times, using a discrete element method (DEM) simulation. This experiment has investigated the characteristics of spherical particle morphology evolution involved in the mechanical alloying of copper powder. The morphological evolution of the copper particle was analyzed using scanning electron microscopy (SEM). A spherical copper particle was shown with a roundness value using imageJ software. The DEM was used to simulate the ball motion in a planetary ball mill, and the impact energy and shear energy generated during the collision were analyzed to estimate the contact number between the ball and the ball wall. Therefore, as the size of the ball decreased, the number of ball-to-ball and ball-to-wall contacts increased accordingly, and the spherical shape of the copper powder changed.

中文翻译：

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使用球磨工艺和 DEM 模拟控制球形粉末制造的颗粒形态

使用离散元法 (DEM) 模拟，在不同的实验条件下，例如不同的球直径、高转速和研磨时间，研究了铜粉上球形颗粒的特性和尺寸变化。本实验研究了铜粉机械合金化过程中球形颗粒形态演化的特征。使用扫描电子显微镜（SEM）分析铜颗粒的形态演变。使用 imageJ 软件显示球形铜颗粒的圆度值。利用DEM模拟行星式球磨机中钢球的运动，分析碰撞过程中产生的冲击能和剪切能，估算钢球与球壁的接触次数。因此，随着球尺寸的减小，球与球、球与壁的接触次数相应增加，铜粉的球形形状发生变化。