A Model for Creep and Creep Damage in the γ-Titanium Aluminide Ti-45Al-2Mn-2Nb

Materials

William Harrison¹  Zakaria Abdallah² 

[1] Materials Research Centre, Swansea University, Singleton Park, Swansea SA2 8PP, UK;

关键词: gamma titanium aluminide;    creep;    intermetallics;    θ-projection method;   

DOI  :  10.3390/ma7032194

来源: mdpi

【 摘 要 】

Gamma titanium aluminides (γ-TiAl) display significantly improved high temperature mechanical properties over conventional titanium alloys. Due to their low densities, these alloys are increasingly becoming strong candidates to replace nickel-base superalloys in future gas turbine aeroengine components. To determine the safe operating life of such components, a good understanding of their creep properties is essential. Of particular importance to gas turbine component design is the ability to accurately predict the rate of accumulation of creep strain to ensure that excessive deformation does not occur during the component’s service life and to quantify the effects of creep on fatigue life. The theta (θ) projection technique is an illustrative example of a creep curve method which has, in this paper, been utilised to accurately represent the creep behaviour of the γ-TiAl alloy Ti -45Al-2Mn-2Nb. Furthermore, a continuum damage approach based on the θ-projection method has also been used to represent tertiary creep damage and accurately predict creep rupture.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland