Abstract
In order to improve the application-related properties, as fracture toughness, creep response and oxidation behavior of Mo-Si-B alloys, certain alloying strategies can be applied. Promising alloying partners like Zr and La2O3 may help to enhance the compressive and flexural strength of Mo-Si-B materials. Accordingly, a combination of 1 at.% Zr and 0.5 wt.% La2O3 was chosen in order to improve the characteristic properties of a powder metallurgical (PM) Mo-6Si-5B alloy. The influence of Zr and La2O3 on the phase distribution and the mechanical properties will be discussed by means of three-point-flexure at room temperature as well as uniaxial com-pressive creep tests at elevated temperatures (> 1000 °C). Compared with other PM Mo-Si-B alloys the present Zr-La2O3-strengthened alloy shows highly improved fracture toughness at room temperature.
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