Oxidation resistant NbCr2 phase in Nb-W-Cr system

被引：0
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作者：
Ventura, Julieta [1 ]
Portillo, Benedict [1 ]
Varma, S.K. [1 ]
机构：
[1] Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX 79968-0520, United States
来源：
Journal of Alloys and Compounds | 2009年 / 476卷 / 1-2期
关键词：
Alloys of Nb-20W-5Cr and Nb-20W-10Cr (in weight percents) have been subjected to oxidation in air for 24 h at temperatures ranging from 700 to 1400 °C. Oxidation resistance revealed by weight gain per unit area after each oxidation treatment shows better oxidation resistance for 10Cr alloy. However; the alloy system shows phase transformations that may be directly affecting the oxidation resistance. 5Cr alloy becomes single phase around 1100-1200 °C and remains single phase until 1400 °C. It is anticipated that the second phase NbCr2 provides the resistance to oxidation in these alloys since 10Cr alloy has less weight gain in the temperature range from 1000 to 1300 °C. Isothermal sections of the ternary Nb-W-Cr phase diagram allow us to make such analysis. © 2008 Elsevier B.V. All rights reserved;
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页码：257 / 262
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