Microstructural changes of oxide dispersion strengthened copper powders fabricated by mechanical alloying
Microstructural changes of oxide dispersion strengthened copper powders fabricated by mechanical alloying
复制标题
机械合金化制备氧化物弥散强化铜粉的微观结构变化
DOI：
10.1016/j.fusengdes.2021.112804
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发表时间：
2021
影响因子：
1.7
通讯作者：
Konno Toyohiko J.
中科院分区：
文献类型：
--
作者：
Shimada Yusuke;Mizumoto Masataka;Hishinuma Yoshimitsu;Ikeda Ken-ichi;Yoshida Kenta;Noto Hiroyuki;Ma Bing;Muroga Takeo;Nagai Yasuyoshi;Konno Toyohiko J.
采用机械合金化(MA)Cu-Y粉末热等静压(HIP)工艺制备了弥散相为Y_2O_3(Y_2O_3)的氧化物弥散强化铜合金(ods-Cu)。它们呈现出由大、小两个铜晶区组成的非均质混晶结构。在细小的铜晶区，Y-₂-O-₃颗粒沿晶界偏聚，并作为裂纹扩展路径，导致脆性断裂。因此，我们研究了机械合金化和热处理工艺对组织的影响，以优化组织结构。4~32 MA小时的粉末形成嵌套的壳状层状结构，有大有小的铜颗粒。由于在310-330℃的温度范围内发生了再结晶和晶粒长大，在500℃的热处理条件下，涂层被破坏。认为Y2O_3向粉末的圆周方向移动。根据这些结果，认为热等静压过程中MA粉末内部结构的变化是Y_2O_3在添加了Y_2O_3的ODS-Cu合金中分布的重要因素。
Oxide dispersion strengthened Cu alloys (ODS-Cu) having dispersed yttria (Y2O3) fabricated using hot isostatic pressing (HIP) of mechanically alloyed (MA) Cu-Y powders. They exhibited a heterogeneous mixed grain structure, which were composed of a large and small Cu grain area. In the small Cu grain regions, Y₂O₃ particles were segregated along the grain boundaries, and acted as a crack propagation path, leading to brittle fracture. Therefore, we investigated the microstructural changes by the MA and heat treatment processes for the microstructure optimization. The powders of 4 to 32 MA hours formed a nested crust-like layered structure with large and small Cu grains. The layers were destroyed by heat treatment at 500°C, because recrystallization and grain growth of Cu occurred in the temperature range of 310 - 330°C. It was considered that Y2O3was moved out to the circumferential area of the powders. Based on these results, it was suggested that the structural changes inside MA powders during HIP are the essential factor of the Y2O3distribution within the Y2O3-added ODS-Cu alloys.