scholarly journals Experimental Investigation of the Effect of Temperature and Strain Rate on the Superplastic Deformation Behavior of Ti-Based Alloys in the (α+β) Temperature Field

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 819 ◽  
Author(s):  
Ahmed Mosleh ◽  
Anastasia Mikhaylovskaya ◽  
Anton Kotov ◽  
Waheed AbuShanab ◽  
Essam Moustafa ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Al Alloys ◽  
Effect Of Temperature ◽  
Al Alloy ◽  
Softening Effect ◽  
Elongation To Failure ◽  
Hardening Coefficient

This paper presents the effect of temperature and strain rate on the superplastic deformation behavior of Ti-3%Mo-1%V-4%Al, Ti-4%V-6%Al, and Ti-1.8%Mn-2.5%Al alloys, which have different initial microstructures. The microstructure, before and after superplastic deformation in the deformation regimes that provided the maximum elongation, was analyzed. The deformation regimes, corresponding to the minimum strain hardening/softening effect, provided a higher elongation to failure due to their low tendency toward dynamic grain growth. As the values of stress became steady (σs), the elongation to failure and strain-hardening coefficient were analyzed under various temperature–strain rate deformation regimes. The analysis of variance of these values was performed to determine the most influential control parameter. The results showed that the strain rate was a more significant parameter than the temperature, with respect to the σs, for the investigated alloys. The most influential parameter, with both the elongation to failure and strain-hardening coefficient, was the temperature of the Ti-3%Mo-1%V-4%Al and Ti-1.8%Mn-2.5%Al alloys and the strain rate of the Ti-4%V-6%Al alloy.

Grain Refinement and Superplastic Deformation Behavior of Zn-Al Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 1775-1780
Author(s):  
Keun Joon Kim ◽  
Gil Hwan Na ◽  
Tae Kwon Ha
Keyword(s):  
Grain Refinement ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Al Alloys ◽  
Al Alloy ◽  
Strain Rates ◽  
Processing Maps ◽  
Compression Tests ◽  
Angular Pressing ◽  
Fine Grain

Grain refinement and superplastic deformation behavior of Zn-Al alloys were investigated in this study. To obtain fine grain size in Zn-0.3Al alloys, rolling and equal channel angular pressing (ECAP) were conducted at temperatures from 40 to 160°C after casting and homogenization heat treatment. Material processing maps for Zn-0.3Al alloy were constructed from a series of compression tests conducted at temperatures from RT to 200°C and strain rates from 3×10-2 to 101 s-1. Superplasticity of ECAPed specimens were evaluated at the temperature of 100°C under the strain rate of 2×10-4 s-1. After ECAP of the Zn-0.3Al alloy, elongation was dramatically increased up to 500%. The effects of ECAP on the texture and anisotropy in the superplastic deformation bebavior were found to be negligible.

Effect of temperature and strain rate on hot deformation behavior and microstructure of Al-Cu-Li alloy

2017 ◽  
Vol 723 ◽  
pp. 548-558 ◽  
Author(s):  
Niraj Nayan ◽  
S.V.S. Narayana Murty ◽  
Sumit Chhangani ◽  
Aditya Prakash ◽  
M.J.N.V. Prasad ◽  
...  
Keyword(s):  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Effect Of Temperature ◽  
Hot Deformation Behavior

Flow Stress and Elongation of Superplastic Deformation in La55Al25Ni20 Metallic Glass

1999 ◽  
Vol 601 ◽  
Author(s):  
Y. Kawamura ◽  
A. Inoue
Keyword(s):  
Flow Stress ◽  
Metallic Glass ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Constant Strain Rate ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Elongation To Failure ◽  
Crosshead Velocity

AbstractWe have investigated the flow stress and elongation of superplastic deformation in a La55Al25Ni20 (at%) metallic glass that has a wide supercooled liquid region of 72 K before crystallization. The superplasticity that appeared in the supercooled liquid region was generated by the Newtonian viscous flow that exhibits the m value of unity. The elongation to failure was restricted by the transition of the Newtonian flow to non-Newtonian one and the crystallization during deformation. We succeeded in establishing the constitutive formulation of the flow stress in the supercooled liquid region. Its formulation was expressed very well by a stretched exponential function σflow=Dε exp(H*/RT) [1-exp(E/{ε exp(H**/RT)}0.82)]. Formulations describing the elongation to failure in constant-strain-rate and constant-crosshead velocity tests were, moreover, established. It was found from the simulation that the maximum elongation in the constant-strain-rate test reached more than 106% which was two orders of magnitude larger than that in the constant-crosshead-velocity test.

Superplasticity of AlCoCrCuFeNi High Entropy Alloy

2012 ◽  
Vol 735 ◽  
pp. 146-151 ◽  
Author(s):  
Andrey V. Kuznetsov ◽  
Dmitry G. Shaisultanov ◽  
Nikita Stepanov ◽  
Gennady A. Salishchev ◽  
Oleg N. Senkov
Keyword(s):  
Particle Size ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Tensile Ductility ◽  
Rate Sensitivity ◽  
Particle Growth ◽  
High Entropy Alloy ◽  
Superplastic Behavior ◽  
High Entropy ◽  
Elongation To Failure

An AlCoCrCuFeNi high entropy alloy was multiaxially isothermally forged at 950°C to produce a fine equiaxed structure with the average grain/particle size of ~1.5 µm. The forged alloy exhibited superplastic behavior in the temperature range of 800-1000°C. For example, during deformation at a strain rate of 10-3 s-1, tensile ductility increased from 400% to 860% when the temperature increased from 800°C to 1000°C. An increase in strain rate from 10-4 to 10-2 s-1 at T = 1000°C did not affect ductility: elongation to failure was about 800%. The strain rate sensitivity of the flow stress was rather high, m = 0.6, which is typical to the superplastic behavior. The equiaxed morphology of grains and particles retained after the superplastic deformation, although some grain/particle growth was observed.

Superplastic deformation behavior of carbon nanotube reinforced 7055 Al alloy composites

2020 ◽  
Vol 797 ◽  
pp. 140263
Author(s):  
S. Bi ◽  
Z.Y. Liu ◽  
B.H. Yu ◽  
G.N. Ma ◽  
L.H. Wu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Al Alloy

Strain rate sensitivity and strain hardening response of DP1000 dual phase steel

2018 ◽  
Vol 115 (5) ◽  
pp. 507
Author(s):  
Onur Çavusoglu ◽  
Hakan Gürün ◽  
Serkan Toros ◽  
Ahmet Güral
Keyword(s):  
Tensile Strength ◽  
Strain Rate ◽  
Strain Hardening ◽  
Strain Rate Sensitivity ◽  
Dual Phase Steel ◽  
Rate Sensitivity ◽  
Dual Phase ◽  
Significant Difference ◽  
Load Carrying ◽  
Hardening Coefficient

In this study, strain hardening and strain rate sensitivity behavior of commercial DP1000 dual phase steel have been examined in detail at temperatures of 25 °C, 100 °C, 200 °C and 300 °C, at strain rates of 0.0016 s−1 and 0.16 s−1. As the strain rate has increased, the yield strength has increased but no significant change in tensile strength and strain hardening coefficient has been observed. As the temperature has increased, the yield and tensile strength has decreased in between 25 and 200 °C but it has showed an increase at 300 °C. The strain hardening coefficient has increased in parallel with temperature increase. It has been seen that the strain rate sensitivity has not been affected by temperature. No significant difference in the hardening rate has appeared in between 25 and 200 °C, but the highest value has been calculated at 300 °C. It has been determined that the fracture behavior has occurred earlier and load carrying capacity on necking has reduced with the increase of strain rate and not significantly affected by temperature.

scholarly journals Superplastic Deformation Behavior in Mg–Al Alloy, AZ91, Grain Refined by Isothermal-rolling

2006 ◽  
Vol 46 (5) ◽  
pp. 694-697 ◽  
Author(s):  
Shuichi Fudetani ◽  
Shigeyuki Mizunari ◽  
Masahiko Horihata ◽  
Yasunori Torisaka ◽  
Mitsuji Hirohashi
Keyword(s):  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Al Alloy ◽  
Alloy Az91

Behaviour of Tube under Axial Crush Load with Considering Effect of Heat Exchanged

2011 ◽  
Vol 141 ◽  
pp. 224-232
Author(s):  
Xiang Sheng Dai ◽  
Jian Min Ma
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Total Energy ◽  
Effect Of Temperature ◽  
Displacement Curve ◽  
Softening Effect ◽  
Axial Crush ◽  
Load Displacement

Based on Johnson-Cook constitutive equation energy absorbed by tubes under axial crush load is studied by using Singace fold model with considering strengthening effects of strain rate,strengthening effects of strain and softening effect of temperature which should consider heat exchanged ; the total energy absorbed by tubes,mean load and load-displacement curve are obtained by method of divided step fold; and the relation between them and radius of tube,thickness of tube,fold velocity of tube is analysed.

Deformation Behavior and Microstructure Evolution of 6063 Alloy during Hot Compression

2018 ◽  
Vol 913 ◽  
pp. 63-68 ◽  
Author(s):  
Zhu Hua Yu ◽  
Da Tong Zhang ◽  
Wen Zhang ◽  
Cheng Qiu
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Shear Bands ◽  
Hot Compression ◽  
Al Alloy ◽  
Strain Rates ◽  
Compression Tests ◽  
Softening Effect ◽  
6063 Al Alloy ◽  
Gleeble 3500

Hot compression tests of homogenized 6063 Al alloy were carried out in the temperatures range from 390°C to 510°C and strain rates from 1s-1 to 20s-1 on a Gleeble-3500 thermal simulation machine. The results showed that the flow stress decreased with increasing deformation temperature or decreasing strain rate. The dynamic softening effect was more obvious when the alloy was deformed at strain rate of 20 s-1. The Arrhenius-type constitutive equation with strain compensation can accurately describe the flow stress of 6063 aluminum alloy during hot compression. Shear bands appeared in grains interior when the alloy deformed at high strain rates, corresponding to high Zenner-Hollomon (Z) parameters. When deformed under the conditions with low Z parameters, the dynamic recrystallization started occurred.

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