A study on microstructure development and oxidation phenomenon of arc consolidated Mo-Nb-Si-(Y) alloys

被引：2
作者：
Majumdar, Sanjib [1 ]
机构：
[1] Bhabha Atom Res Ctr, Mat Proc & Corros Engn Div, High Temp Mat Dev Sect, Bombay 400085, Maharashtra, India
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2019年 / 78卷
关键词：
High-temperature materials; Molybdenum silicides; Electron back scattered diffraction; Oxidation; Oxide scale; MO-SI-B; MECHANISMS; RESISTANCE; BEHAVIOR;
D O I：
10.1016/j.ijrmhm.2018.08.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two alloys of compositions Mo-26Nb-19Si and Mo-26Nb-19Si-0.5Y (at.%) were prepared by non-consumable arc melting. The alloys characterized using BSE, EDS and EBSD techniques confirmed the formation of two phase (Mo, Nh)(SS)-(Mo, Nb)(5)Si-3 microstructures. Y-rich (Y2O3) particles were mainly found to be present at the inter phase boundaries creating different phase morphologies in Mo-26Nb-19Si-0.5Y alloy. Both the phases showed a preferred orientation indicating a directional growth during solidification. Oxidation tests conducted in air at 1000 and 1300 degrees C showed a porous oxide scale formation on the alloy surface and loss of material due to evaporation of MoO3. The detailed SEM-EDS analysis of the oxide scale formed on these alloys in argon environment at 1000 degrees C, indicated the presence of Nb2O5 particles in the silica (SiO2) matrix.
引用
收藏
页码：76 / 84
页数：9
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