High-temperature oxidation behavior of TaTiCr, Ta4Ti3Cr, Ta2TiCr, and Ta4TiCr3 concentrated refractory alloys
High-temperature oxidation behavior of TaTiCr, Ta4Ti3Cr, Ta2TiCr, and Ta4TiCr3 concentrated refractory alloys
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DOI：
10.1016/j.jallcom.2023.169000
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发表时间：
2023-04
影响因子：
6.2
通讯作者：
Noah J. Welch;M. Quintana;T. Butler;P. Collins
中科院分区：
文献类型：
--
作者：
Noah J. Welch;M. Quintana;T. Butler;P. Collins
本文报道了TaTiCr、Ta 4 Ti 3Cr、Ta 2 TiCr和Ta 4 TiCr 3浓缩型耐火合金的独特显微组织和高温氧化行为，并阐明了适度的成分变化对氧化性能的影响。所有合金均形成具有第二相Laves沉淀的BCC固溶体基体在1200 °C下对合金进行24 h的氧化试验，其中：TaTiCr在试验期间表现出上级氧化性能，Ta 4 TiCr 3表现出中等的抗氧化性，具有抛物线和线性动力学区域; Ta_4Ti_3Cr和Ta_2TiCr的氧化性能都很差，试验后Ta_2TiCr被完全氧化。所有合金形成复合氧化物;然而，TaTiCr合金的优异性能可归因于氧化物膜的致密、连续性质、复合氧化物和保护性Cr2 O3形成的组合，以及复杂的内部氮化物形态，减缓氧气进入并减少内部氧化的深度。
This study reports the unique microstructures and high-temperature oxidation behavior of TaTiCr, Ta4Ti3Cr, Ta2TiCr, and Ta4TiCr3concentrated refractory alloys and elucidates the effect of moderate composition changes on oxidation performance. All alloys investigated in this study formedbccsolid solution matrices with second phase Laves precipitates (except for Ta4Ti3Cr, being single-phasebcc).The alloys were tested for 24 h at 1200 °C, of which: TaTiCr exhibited superior oxidation performance for the duration of the test; Ta4TiCr3showed moderate oxidation resistance, with both parabolic and linear kinetic regimes; and Ta4Ti3Cr and Ta2TiCr both exhibited poor oxidation performance, with Ta2TiCr being completely oxidized after testing. All alloys formed complex oxides; however, the excellent performance of the TaTiCr alloy can be attributed to the compact, continuous nature of the oxide scale, the combination of complex oxides and protective Cr2O3formation, and the complex internal nitride morphology, slowing oxygen ingress and reducing the depth of internal oxidation.