锻造态W-1％La2O3合金的纳米颗粒相分析

Phase Analysis of Nano-sized Particles in an As-forged W-1％La2O3 Alloy

摘要:

W-1%La2O3合金被认为是未来聚变堆内面向等离子体组件的候选材料之一。本文利用透射电子显微镜对锻造状态W-1%La2O3合金的相，特别是纳米尺度颗粒相，进行了分析。共发现八中颗粒相，包括：三种不同类型的La2O3相；两种类型的WO3相；W3O8相；La0.14WO3相；以及(La2O3)5WO3相。其中La2O3、WO3和W3O8为合金中主要的纳米颗粒相，这些颗粒的尺寸主要集中在20~100 nm范围内。同时讨论了W-1%La2O3合金颗粒相的可能形成过程。

Abstract:

W–1% La2O3 alloy is considered as one of the candidate material for plasma-facing components of future fusion reactors. The phases of as-forged W–1% La2O3 alloy, especially the nano-sized particle phases, have been investigated using transmission electron microscopes．Eight kinds of particle phases have been found in the alloy. They are: three kinds of La2O3 phases; two kinds of WO3 phases; W3O8 phase; La0.14WO3 phase and (La2O3)5WO3 phase. La2O3, WO3 and W3O8 are dominant nano-sized phases in the alloy. These particles have sizes ranging from about 20 nm to about 100 nm. The possible formation processes of these particle phases are also discussed.