Mo-Cu高能球磨过程实验研究及固溶度数值模拟

Experimental investigation and solubility numerical simulation of high energy milling Mo-Cu

采用高能球磨方法对Mo-3%(质量分数)Cu、Mo-10%(质量分数)Cu复合粉末进行机械合金化加工,球磨时间为0～50h。通过扫描电镜及X射线衍射等对复合粉末的形貌、X射线衍射特征进行了分析,并对Cu在Mo中的固溶度用热力学方法进行了研究。结果表明,通过机械合金化方法可以得到超细小且均匀的纳米晶复合粉末,平均晶粒尺寸在60nm左右;从热力学平衡角度出发,通过细化晶粒来提高Cu在Mo中的固溶度极限可以用数值模拟来表达。

Mo-3wt %Cu and Mo-10wt%Cu composite powders was processed by using a technology of mechanical alloying for a range of milling times up 50h. An analysis was made on the micrograph and character of Mo-Cu composite powders by SEM and XRD, and solubility of Cu in Mo was studied by thermodynamic method. The results indicate that ultrafine and very homogeneous composite powders can be fabricated by using a technology of mechanical alloying, average crystallite size was about 80nm; from thermodynamic balance, increasing solubility of Cu in Mo through crystal refinement can be expressed by numerical simulation.