An Analysis of Small Punch Creep Behaviour in the Gamma Titanium Aluminide Ti-45Al-2Mn-2Nb

Previous literature on gamma titanium alumindes(γ-TiAl) have found that this family of alloys offer significant potential for replacing more conventional nickel and titanium based alloy systems in future designs of gas turbine engines. Despite the inherent brittle nature of such materials, γ-TiAl typically exhibits considerable ductility at elevated temperatures and a demonstrable uniaxial creep response. Until now, the creep properties of γ-TiAl have primarily been sourced from conventional uniaxial approaches, … Continue reading An Analysis of Small Punch Creep Behaviour in the Gamma Titanium Aluminide Ti-45Al-2Mn-2Nb

Structural Integrity of an Electron Beam Melted Titanium Alloy

Advanced manufacturing encompasses the wide range of processes that consist of “3D printing” of metallic materials. One such method is Electron Beam Melting (EBM), a modern build technology that offers significant potential for lean manufacture and a capability to produce fully dense near-net shaped components. However, the manufacture of intricate geometries will result in variable thermal cycles and thus a transient microstructure throughout, leading to a highly textured structure. … Continue reading Structural Integrity of an Electron Beam Melted Titanium Alloy

A Critical Analysis of the Conventionally Employed Creep Lifing Methods

The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with … Continue reading A Critical Analysis of the Conventionally Employed Creep Lifing Methods

Application of the Theta Projection Technique to the Creep Behaviour of the γ-Titanium Aluminide Ti -45Al-2Mn-2Nb

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 … Continue reading Application of the Theta Projection Technique to the Creep Behaviour of the γ-Titanium Aluminide Ti -45Al-2Mn-2Nb

An analysis of modern creep lifing methodologies in the titanium alloy Ti6-4

Traditional creep lifing techniques based on power law equations have shown themselves to be extremely limited, particularly in the prediction of long term data based only on short term experiments. More recently, alternative approaches such as the Wilshire equations and hyperbolic tangent methods have been proposed which offer a new insight into the field, with the Wilshire equations in particular showing promise in predicting long term behaviour based on … Continue reading An analysis of modern creep lifing methodologies in the titanium alloy Ti6-4

A model for time dependent strain accumulation and damage at low temperatures in Ti–6Al–4V

Dwell fatigue effects at low temperatures in a range of titanium alloys have been well documented since the 1970s. However, attempts to model dwell fatigue phenomena are limited. The time dependent effects have been shown to be due to the inherent strain accumulation behaviour at ambient or low temperatures, loosely termed ‘cold creep’ in alloys such as Ti-6Al-4V. Periods of dwell in a fatigue cycle … Continue reading A model for time dependent strain accumulation and damage at low temperatures in Ti–6Al–4V

High temperature creep behaviour in the γ titanium aluminide Ti–45Al–2Mn–2Nb

Gamma titanium aluminides (γ-TiAl) offer strong potential for replacing conventional titanium and nickel-base alloys in future gas turbine engine designs. This is attributed to their lower density compared to the conventional alloys, as well as their high temperature capability and relative resistance to highly oxidising environments. The system Ti-45Al-2Mn-2Nb has been extensively studied under high temperature creep conditions. When compared to an existing, conventional, high … Continue reading High temperature creep behaviour in the γ titanium aluminide Ti–45Al–2Mn–2Nb