Deformation behavior and constitutive model for high temperature compression of a newly type of Ni 3 Al‐based superalloy

2019 ◽  
Vol 50 (9) ◽  
pp. 1094-1105
Author(s):  
J. Zhong ◽  
Z. Xu ◽  
B. Liu ◽  
Q. Xu ◽  
C. Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Constitutive Model ◽  
Deformation Behavior

A Multi-Scale Constitutive Model in High Temperature Deformation of Near Alpha Ti-5.6Al-4.8Sn-2.0Zr Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 1598-1601 ◽  
Author(s):  
Miao Quan Li ◽  
Jiao Luo
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Flow Stress ◽  
Constitutive Model ◽  
Deformation Behavior ◽  
Volume Fraction ◽  
Optimization Technique ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Multi Scale

Isothermal compression of near alpha Ti-5.6Al-4.8Sn-2.0Zr alloy is conducted on a Thermecmaster-Z simulator at the deformation temperatures ranging from 1173 K to 1333 K, the strain rates ranging from 0.001 s-1 to 10.0 s-1 at an interval of an order magnitude and the height reductions ranging from 50% to 70%. The primary grain size is measured at an OLYMPUS PMG3 microscope with the quantitative metallography SISC IAS V8.0 image analysis software. A multi-scale constitutive model coupling the grain size, volume fraction and dislocation density is established to represent the deformation behavior of near alpha Ti-5.6Al-4.8Sn-2.0Zr alloy in high temperature deformation, in which the flow stress is decomposed a thermal stress and an athermal stress. A Kock-Mecking model is adopted to describe the thermally activated stress, and an athermal stress model accounts for the working hardening and Hall-Petch effect. A genetic algorithm (GA)-based objective optimization technique is used for determining material constants in this study. The mean relative difference between the predicted and experimental flow stress is 5.98%, thus it can be concluded that the multi-scale constitutive model with high prediction precision can efficiently predict the deformation behavior of near alpha Ti-5.6Al-4.8Sn-2.0Zr alloy in high temperature deformation.

scholarly journals The Study on Forming Property at High Temperature and Processing Map of 2219 Aluminum Alloy

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 77
Author(s):  
Xiang-Dong Jia ◽  
Yi-Ning Wang ◽  
Ying Zhou ◽  
Miao-Yan Cao
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Constitutive Model ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Rate ◽  
Deformation Temperature ◽  
Processing Map ◽  
Rate Condition ◽  
2219 Aluminum Alloy

2219 aluminum alloy is a kind of high-strength Al-Cu-Mn alloy that can be strengthened by heat treatment. Its mechanical property parameters and forming properties are greatly affected by the deformation rate, temperature and strain. Taking 2219 aluminum alloy extruded bar as the research object, the Gleeble-3500 thermomechanical simulator was used to analyze the thermal compression deformation behavior of 2219 aluminum alloy under different temperatures and strain rates. The results show that the deformation behavior of 2219 aluminum alloy under high temperatures is greatly influenced by the deformation temperature and strain rate, and the flow stress is the result of high-temperature softening, strain hardening and deformation rate hardening. According to the experiment results, the Arrhenius constitutive model and the exponential constitutive model considering the influence of temperature and strain rate, respectively, were established, and the predicted results of the two constitutive models were in good agreement with the test results. On this basis, the processing map of 2219 aluminum alloy was established. Under the same strain rate condition with an increase of the deformation temperature, the power dissipation efficiency increases gradually, and the driving force of 2219 aluminum alloy to change its microstructure increases gradually. At the same deformation temperature, the lower the strain rate, the less possibility of plastic instability.

High Temperature Deformation Mechanism Maps of NiAl

2004 ◽  
Vol 449-452 ◽  
pp. 57-60
Author(s):  
I.G. Lee ◽  
A.K. Ghosh
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Deformation Mechanism ◽  
Calculation Method ◽  
Deformation Behavior ◽  
Tensile Tests ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Grain Sizes ◽  
Temperature Strain

In order to analyze high temperature deformation behavior of NiAl alloys, deformation maps were constructed for stoichiometric NiAl materials with grain sizes of 4 and 200 µm. Relevant constitute equations and calculation method will be described in this paper. These maps are particularly useful in identifying the location of testing domains, such as creep and tensile tests, in relation to the stress-temperature-strain rate domains experienced by NiAl.

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