The Influence of Ti and Al Additions on the Mechanical Response of Cobalt Superalloy

Tao Hsing Chen

doi:10.4028/www.scientific.net/AMM.284-287.235

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 284-287The Influence of Ti and Al Additions on the...

The Influence of Ti and Al Additions on the Mechanical Response of Cobalt Superalloy

Abstract:

The effect of titanium and aluminum contents, strain, strain rate and tested temperatures on the mechanical properties and microstructural properties will be investigated in this study. These cobalt base super alloys are to be tested using material testing system (MTS) at strain rates of 10-3, 10-2 and 10-1s-1 and at temperatures of 700°C, 500°C and 25°C respectively. It is found that the flow stress increases with increasing strain rate and Ti and Al contents, but decreases with increasing temperature. Furthermore, the strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The microstructural observations confirm that the mechanical response of the cobalt superalloy specimens is directly related to the effects of the titanium and aluminum contents, strain rate and temperature on the evolution of the microstructure. It can be observed that the strengthening effect in cobalt suprealloy is a result primarily of dislocation multiplication. The dislocation density increases with increasing strain rate, but decreases with increasing temperature.