Tailoring the mechanical properties of titanium alloys via plasticity induced transformations

Tailoring the mechanical properties of titanium alloys via plasticity induced transformations

Neelakantan, S.

Van der Zwaag, S. (promotor)

Aerospace Engineering

Mechanics, Aerospace Structures & Materials

2010-07-07

Titanium alloys possess good corrosion properties, high temperature stability and high strength-to-weight ratio. However, they fall short in providing the optimum strength-ductility relation in the most demanding structural applications, including the aerospace sector. Inspired by the possibility of enhancing the strength-ductility relation in steels through the TRIP effect, the thesis elucidates at: i) identifying and quantifying the key factors that effectively control and/or promote such effect (termed here as Plasticity induced Transformation in Titanium alloys (PiTTi)), and exploring the plausible property improvements it may lead in metastable beta titanium alloys, through experimentation; ii) theoretically optimizing the key factor, Ms temperature, by proposing a thermodynamic based model for prediction of martensite formation (i.e., Ms temperature) in both binary and multi-component beta titanium alloys with effective validation; and iii) proposing, by controlling the mentioned key factors that effectively promote PiTTi effect, a novel theoretical alloy design methodology that lead to achieving new grades of titanium alloys for potentially improved properties.

titanium alloys,
Ms temperature model,
alloy design,
thermodynamics,
martensitic transformation,
metastable beta alloys,
mechanical properties

http://resolver.tudelft.nl/uuid:a05bbbd4-fa38-473d-b984-bfa5ade6c00f

Ipskamp Drukkers

9789077172575

Institutional Repository

doctoral thesis

(c) 2010 Neelakantan, S.