Constitutive model for high temperature deformation of titanium alloys using internal state variables

2010 ◽  
Vol 42 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Jiao Luo ◽  
Miaoquan Li ◽  
Xiaoli Li ◽  
Yanpei Shi
Keyword(s):  
High Temperature ◽  
Constitutive Model ◽  
Titanium Alloys ◽  
Internal State ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
State Variables ◽  
Internal State Variables

Mechanisms and Models of High Temperature Deformation of Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
Malcolm McLean
Keyword(s):  
High Temperature ◽  
Internal State ◽  
Creep Behaviour ◽  
Deformation Mechanisms ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
State Variables ◽  
Advanced Composites ◽  
Internal State Variables ◽  
Deformation Modes

AbstractThe deformation mechanisms that can occur in advanced composites at high temperature are reviewed and the implications of different deformation modes in the constituent phases for the creep behaviour of the composite are considered. A generalised description of creep of composites in terms of internal state variables that have clear physical significance is presented.

Constitutive Modeling of Beta Titanium Alloy Ti-10V-4.5Fe-1.5Al during Hot Deformation Process

2012 ◽  
Vol 510 ◽  
pp. 729-733
Author(s):  
Feng Bo Han ◽  
Jin Shan Li ◽  
Hong Chao Kou ◽  
Bin Tang ◽  
Min Jie Lai ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Dislocation Density ◽  
Internal State ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Model Parameters ◽  
Internal State Variable ◽  
Dislocation Interaction ◽  
State Variable

A constitutive model using dislocation density rate as an internal state variable has been proposed for hot working of β titanium alloy in this paper. The β phase was only taken into consideration during high temperature deformation. The solution strengthening and dislocation interaction were included in the constitutive equations. The strength coefficient was determined by equivalent vanadium content, Veq, which was calculated according to the alloy constituent. A Kocks-Mecking model was adopted to describe the variation of dislocation density. The constitutive relationship of a β titanium alloy Ti-10V-4.5Fe-1.5Al for high temperature deformation was established using the internal-state-variable based model. Model parameters were determined by the genetic algorithm based objective optimization method. The predicted results agree fairly well with the experimental value.

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