Dispersion-strengthened (DS) copper alloys with Y₂O₃ particles are known as high strength and high thermal conductivity materials having potential for heat sink materials of fusion devices. In the previous study on mechanical alloying (MA) and hot isostatic pressing (HIP) processing of DS-Cu alloys, the MA powders showed various morphology and size distribution which influenced the properties of the MA-HIP samples. In this study, the MA alloyed powders with 3 wt% Y₂O₃ particles were classified by their size and characterized. The particles ranged from fine particles of under 46 μm to coarse particles of 212 μm over, and a wide particle size distribution was confirmed. The peeled Cu-O fragments from coarser MA powders are the main source of finer grain with 46 μm. The finer grains had oxide-like behavior as microstructural and mechanical properties. On the other hand, the coarser powder having over 212 μm had metal-like behavior as microstructural and mechanical properties. We thought that the classification of the MA powder before HIP process was one of the suitable process to optimize the microstructure and several properties of ODS-Cu alloy.

具有Y ₂ O ₃颗粒的弥散强化（DS）铜合金是已知的高强度和高导热性材料，具有用于聚变装置的散热材料的潜力。在先前对DS-Cu合金进行机械合金化（MA）和热等静压（HIP）处理的研究中，MA粉末表现出各种形态和尺寸分布，从而影响了MA-HIP样品的性能。在这项研究中，MA合金粉末具有3 wt％的Y ₂ O ₃颗粒按其大小分类并进行表征。颗粒的范围从46μm以下的细颗粒到212μm以上的粗颗粒，并且确认到宽的粒径分布。从较粗的MA粉中剥离的Cu-O碎片是46μm的较细晶粒的主要来源。较细的晶粒具有类似于氧化物的行为，如显微组织和机械性能。另一方面，超过212μm的较粗粉末具有如金属的行为，如微观结构和机械性能。我们认为，在HIP工艺之前对MA粉末进行分类是优化ODS-Cu合金的微观结构和若干性能的合适工艺之一。