摘要
An investigation was carried out to study the effects ofγ'formation and strengthening elements(Al,Ti and Ta)on the microstructure and stress rupture properties of nickel base single crystal super-alloys.The results show that with the increase ofγ'formation and strengthening elements,the percentage ofγ-γ'eutectic and the misfit degree ofγ/γ'increases.Detailed microstructural analysis revealed that with the increase ofγ'forming element content,the morphology ofγ'changed from spherical to cubic,then irregular shape;and the size ofγ'increases gradually.Excessiveγ'formation and strengthening elements will lead to the precipitation ofμphase during stress rupture tests.The alloy with 5wt.%Al,1wt.%Ti and 6wt.%Ta has the best stress rupture property.
