Deformation Behaviors of 6061 and 7075 Aluminum Tubes at Elevated Temperatures for Warm Hydroforming

2005 ◽  
pp. 373-376
Author(s):  
Dong Woo Suh ◽  
Sung Man Sohn ◽  
Moon Yong Lee ◽  
Sang Yong Lee
Keyword(s):  
Elevated Temperatures ◽  
Aluminum Tubes ◽  
Deformation Behaviors ◽  
Warm Hydroforming

Deformation Behaviors of 6061 and 7075 Aluminum Tubes at Elevated Temperatures for Warm Hydroforming

2005 ◽  
Vol 475-479 ◽  
pp. 373-376
Author(s):  
Dong Woo Suh ◽  
Sung Man Sohn ◽  
Moon Yong Lee ◽  
Sang Yong Lee
Keyword(s):  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Total Elongation ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Local Necking ◽  
Aluminum Tubes ◽  
Hydroforming Process ◽  
Deformation Behaviors ◽  
Warm Hydroforming

The deformation behaviors of fully annealed or T6-treated 6061 and 7075 aluminum tubes are investigated at elevated temperature using uniaxial tensile test. Fully annealed 6061 and 7075 tube, and T6-treated 7075 tube do not show sharp local necking with an elongation of 50% at tensile temperature of 300oC, accordingly, it is expected that warm hydroforming process can be applied. The increase of tensile temperature does not significantly affect the total elongation of T6-treated 6061 tube.

Numerical and Experimental Investigation of Temperature Effect on Thickness Distribution in Warm Hydroforming of Aluminum Tubes

2012 ◽  
Vol 22 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Seyed Jalal Hashemi ◽  
Hassan Moslemi Naeini ◽  
Gholamhosein Liaghat ◽  
Roohollah Azizi Tafti ◽  
Farzad Rahmani
Keyword(s):  
Experimental Investigation ◽  
Temperature Effect ◽  
Thickness Distribution ◽  
Aluminum Tubes ◽  
Warm Hydroforming

scholarly journals The Temperature Dependence of Deformation Behaviors in High-Entropy Alloys: A Review

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2005
Author(s):  
Pengfei Wu ◽  
Kefu Gan ◽  
Dingshun Yan ◽  
Zhiming Li
Keyword(s):  
Single Phase ◽  
Elevated Temperatures ◽  
High Entropy Alloys ◽  
Alloy Development ◽  
Temperature Dependent ◽  
High Entropy ◽  
The Past ◽  
Different Temperatures ◽  
Deformation Behaviors ◽  
Environmental Temperatures

Over the past seventeen years, deformation behaviors of various types of high-entropy alloys (HEAs) have been investigated within a wide temperature range, from cryogenic to high temperatures, to demonstrate the excellent performance of HEAs under extreme conditions. It has been suggested that the dominated deformation mechanisms in HEAs would be varied with respect to the environmental temperatures, which significantly alters the mechanical properties. In this article, we systematically review the temperature-dependent mechanical behaviors, as well as the corresponding mechanisms of various types of HEAs, aiming to provide a comprehensive and up-to-date understanding of the recent progress achieved on this subject. More specifically, we summarize the deformation behaviors and microscale mechanisms of single-phase HEAs, metastable HEAs, precipitates-hardened HEAs and multiphase HEAs, at cryogenic, room and elevated temperatures. The possible strategies for strengthening and toughening HEAs at different temperatures are also discussed to provide new insights for further alloy development.

Inelastic Cyclic Deformation Behaviors of Type 316H Stainless Steel for Reactor Pressure Vessel of Sodium-Cooled Fast Reactor at Elevated Temperatures

2015 ◽  
Vol 53 (10) ◽  
pp. 681-687
Author(s):  
Ji-Hyun Yoon ◽  
Young-Chun Kim ◽  
Seokmin Hong ◽  
Gyeong-Hoi Koo ◽  
Bong-Sang Lee
Keyword(s):  
Stainless Steel ◽  
Fast Reactor ◽  
Pressure Vessel ◽  
Cyclic Deformation ◽  
Elevated Temperatures ◽  
Reactor Pressure Vessel ◽  
Deformation Behaviors ◽  
Reactor Pressure

Prediction of bulge height in warm hydroforming of aluminum tubes using ductile fracture criteria

2015 ◽  
Vol 15 (1) ◽  
pp. 19-29 ◽  
Author(s):  
S.J. Hashemi ◽  
H. Moslemi Naeini ◽  
G.H. Liaghat ◽  
R. Azizi Tafti
Keyword(s):  
Ductile Fracture ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria ◽  
Aluminum Tubes ◽  
Warm Hydroforming ◽  
Bulge Height

scholarly journals Creep and Deformation of Metals and Alloys at Elevated Temperatures

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1837
Author(s):  
Nadezhda Dudova
Keyword(s):  
Elevated Temperatures ◽  
Metals And Alloys ◽  
Deformation Behaviors

Various aspects of creep and deformation behaviors of metals and alloys at elevated temperatures are of great interest to materials scientists [...]

scholarly journals The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1755
Author(s):  
Guoliang Xie ◽  
Wenli Xue ◽  
Yilei Fu ◽  
Kai Feng ◽  
Rui Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Microstructural Analysis ◽  
Tensile Sample ◽  
High Temperature Mechanical Properties ◽  
Precipitated Phase ◽  
Heavy Alloys ◽  
The Matrix ◽  
Deformation Behaviors ◽  
Strength And Plasticity

Investigations of the plastic deformation mechanisms of Ni-W-based heavy alloys varying with increasing temperatures are very important for the development of hot forming processes and applications at elevated temperatures. In this study, the continuous variation of strength and plasticity of a novel Ni-W-based heavy alloy with increasing temperatures was investigated. The tensile strength of a Ni48W35Co17 sample at 600 °C was 471 MPa, which was 47% lower than that at 100 °C. A variation in an abnormal decrease in elongations at temperatures from 400 °C to 800 °C was found in this alloy. The elongation rate of the sample tensile at 600 °C was 19%, which was 73% lower than that at 100 °C. A microstructural analysis revealed that the number of twins in the sample tensile at a temperature higher than 600 °C increased considerably compared with the sample tensile at lower temperatures, indicating that the dislocation slips were suppressed during the high-temperature stretching process. The precipitates of the NiW phase were found in the 600 °C tensile sample, which was not clearly observed in the 400 °C tensile sample, suggesting that dislocation slips were affected by the formation of these precipitates. Moreover, the orientation relationship between the matrix and NiW phase was (200)Ni//(240)NiW and [001]Ni//[001]NiW. The tiny precipitated phase was the main reason for the plasticity decrease of the alloy with the temperature increase.

scholarly journals Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy

2020 ◽  
Vol 6 (37) ◽  
pp. eaaz4748 ◽  
Author(s):  
Chanho Lee ◽  
George Kim ◽  
Yi Chou ◽  
Brianna L. Musicó ◽  
Michael C. Gao ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Neutron Diffraction ◽  
Deformation Behavior ◽  
Elevated Temperatures ◽  
High Entropy ◽  
Plastic Deformation Behavior ◽  
Deformation Behaviors ◽  
In Situ Neutron Diffraction ◽  
Elastic And Plastic Deformation

Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic and plastic deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures using integrated experimental efforts and theoretical calculations. The in situ neutron diffraction results reveal a temperature-dependent elastic anisotropic deformation behavior. The single-crystal elastic moduli and macroscopic Young’s, shear, and bulk moduli were determined from the in situ neutron diffraction, showing great agreement with first-principles calculations, machine learning, and resonant ultrasound spectroscopy results. Furthermore, the edge dislocation–dominant plastic deformation behaviors, which are different from conventional BCC alloys, were quantitatively described by the Williamson-Hall plot profile modeling and high-angle annular dark-field scanning transmission electron microscopy.

Deformation Behaviors of Nb Doped Gamma Titanium Aluminides

2004 ◽  
Vol 449-452 ◽  
pp. 837-840 ◽  
Author(s):  
Keizo Hashimoto ◽  
Rieko Matsumoto
Keyword(s):  
Mechanical Properties ◽  
Titanium Aluminides ◽  
Elevated Temperatures ◽  
Slip Systems ◽  
Lower Strength ◽  
Deformation Twins ◽  
Transmission Electron ◽  
Medium Strength ◽  
Deformation Behaviors ◽  
Compositional Changes

In this study, Nb doped γ-TiAl is designed and examined their tensile properties at elevated temperatures. Small compositional changes cause drastic changes of the mechanical properties at 1273K. In order to clarify the deformation mechanism at elevated temperatures, dislocation structures have been observed using transmission electron microscope (TEM). All of the specimens observed by TEM show that at least two slip systems are operating in each grain. The specimen having relatively lower strength and higher tensile elongations shows more than four operating slip systems in the grains. The specimen having a medium strength shows many super-dislocations and their dissociations that block the other dislocation motions. The specimen having the highest strength shows many deformation twins. These observations suggest that deformation twins become the strong obstacles against moving dislocations at elevated temperatures. The relationships between observed dislocation structures and mechanical properties of γ-TiAl are discussed.

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