Internal state variable models for microstructure in high temperature deformation of titanium alloys

2008 ◽  
Vol 51 (11) ◽  
pp. 1921-1929 ◽  
Author(s):  
Jiao Luo ◽  
MiaoQuan Li ◽  
XiaoLi Li
Keyword(s):  
High Temperature ◽  
Titanium Alloys ◽  
Internal State ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Internal State Variable ◽  
State Variable

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.

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.

408 Experimental observation of high temperature deformation of β titanium alloys and its modeling

2010 ◽  
Vol 2010.48 (0) ◽  
pp. 111-112
Author(s):  
Michio YAMAMURA ◽  
Ryota YAMAUCHI ◽  
Xiao teng Wang ◽  
Hiroshi HAMASAKI ◽  
Takashi MAEDA ◽  
...  
Keyword(s):  
High Temperature ◽  
Titanium Alloys ◽  
Experimental Observation ◽  
High Temperature Deformation ◽  
Temperature Deformation
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