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

作者：Harrison William^*; Abdallah Zakaria; Whittaker Mark

来源：Materials, 2014, 7(3): 2194-2209.

DOI：10.3390/ma7032194

• gamma titanium aluminide
• creep
• intermetallics
• theta-projection method

Gamma titanium aluminides (gamma-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%26apos;s service life and to quantify the effects of creep on fatigue life. The theta (theta) 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 gamma-TiAl alloy Ti -45Al-2Mn-2Nb. Furthermore, a continuum damage approach based on the theta-projection method has also been used to represent tertiary creep damage and accurately predict creep rupture.

• 出版日期2014-3