Oxidation Behavior of Alx(CoCrFeNi)100-x High-Entropy Alloys Under Thermal-Cycling Conditions
Oxidation Behavior of Alx(CoCrFeNi)100-x High-Entropy Alloys Under Thermal-Cycling Conditions
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DOI：
10.1007/s11085-021-10048-5
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发表时间：
2021-07
影响因子：
2.2
通讯作者：
J. Dąbrowa;G. Cieślak;M. Stygar;M. Zajusz;M. Jawańska;A. Gil;J. Jedliński;K. Mroczka;K. Matsuda;T. Kulik;M. Danielewski
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文献类型：
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作者：
J. Dąbrowa;G. Cieślak;M. Stygar;M. Zajusz;M. Jawańska;A. Gil;J. Jedliński;K. Mroczka;K. Matsuda;T. Kulik;M. Danielewski
研究了Al-Co-Cr-Fe-Ni系5种高熵合金Alx（CoCrFeNi）100-x（x= 0; 3; 6; 9; 12）在1273 K空气气氛中热循环条件下的氧化行为。所选组合物的选择允许覆盖氧化铬到氧化铝前过渡，以及从FCC单相固溶体结构到具有富含Al的B2结构成分的多相合金的过渡。测量进行500个循环（1个循环-加热1小时，冷却20分钟）。结果表明，具有极其复杂的规模结构和广泛的内部氧化和氮化区，以及在大多数情况下的氧化皮的严重spectum的热循环条件的氧化产物的深刻影响，显示这些合金的有限的有用性在其发展的当前阶段的高温应用。
The oxidation behavior of five different high-entropy alloys from the Al–Co–Cr–Fe–Ni metallic system, namely Alx(CoCrFeNi)100-x(x= 0; 3; 6; 9; 12), was studied under thermal-cycling conditions, at 1273 K in air atmosphere. The choice of selected compositions allowed for covering the chromia-to-alumina former transition, as well as the transition from the FCC single-phase solid solution structure to multiphase alloys with Al-enriched B2-structured constituent. The measurements were taken for 500 cycles (1 cycle - 1 h of heating, 20 min of cooling). The results indicate a profound influence of the thermal-cycling conditions on the oxidation products, with extremely complex scale structures and extensive internal oxidation and nitridation zones, as well as severe spallation of the oxide scale in most cases, showing the limited usefulness of these alloys for high-temperature applications at the current stage of their development.