Creep Resistance and Oxidation Behavior of Novel Mo-Si-B-Ti Alloys

被引：42
作者：
Azim, M. A. [1 ]
Schliephake, D. [2 ]
Hochmuth, C. [3 ]
Gorr, B. [1 ]
Christ, H. -J. [1 ]
Glatzel, U. [3 ]
Heilmaier, M. [2 ]
机构：
[1] Univ Siegen, Inst Werkstofftech, D-57068 Siegen, Germany
[2] Karlsruhe Inst Technol, Inst Angew Mat, D-76131 Karlsruhe, Germany
[3] Univ Bayreuth, Metall Werkstoffe, D-95447 Bayreuth, Germany
来源：
JOM | 2015年 / 67卷 / 11期
关键词：
STRUCTURAL APPLICATIONS; MECHANICAL-PROPERTIES; TEMPERATURE-RANGE; DEGREES-C; PHASE; TI5SI3; COMPOSITES; STABILITY; SYSTEM; MO5SI3;
D O I：
10.1007/s11837-015-1560-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mo-Si-B-alloys are promising materials for high-temperature applications because of their high melting point, excellent phase stability, large alloying capabilities, and reasonable mechanical as well as oxidative properties. A continuing alloy development is, however, required because of the catastrophic oxidation taking place at intermediate temperatures and the rather high density. The addition of Ti stabilizes a new ternary phase field including the Mo5Si3 (T1) phase instead of the Mo3Si (A15) phase. Alloys comprising the phases Mo-ss, T1 and Mo5SiB2 (T2) show very high creep resistance, improved oxidation behavior and significantly reduced density. The new T1 phase seems to play a crucial role in the improved oxidation resistance of these new materials, since this phase exhibits excellent oxidation behavior at intermediate and high temperatures. The 4-component alloys possess superior creep behavior compared to Mo-Si-B alloys with the same microstructural phase arrangement and size or to the single crystal Ni-base superalloy CMSX-4. The main reason was found to be the formation of Ti-rich silicide precipitates during processing.
引用
收藏
页码：2621 / 2628
页数：8
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