A Stacking Fault Energy Perspective into the Uniaxial Tensile Deformation Behavior and Microstructure of a Cr-Mn Austenitic Steel

Uniaxial tensile deformation behavior of 5A90 aluminium-lithium alloy sheet is investigated in the hot forming with the temperature range of 200-450°C and strain rate range of 0.3×10-3-0.2×10-1s-1. It is found that the flow stress of 5A90 Al-Li alloy in uniaxial tension increase with increasing strain rate and decrease with increasing temperature, however, the tendency of total elongation is just the reverse, and the optimum forming temperature is 400°C. The strain rate sensitivity index (m-value) remarkably increases with increasing temperature for a given strain rate. It is shown that 5A90 Al-Li alloy sheet displays the sensitivity to the strain rate at elevated temperatures. For a given strain rate, the strain hardening index (n-value) decreases with increasing temperature, whereas the n-value increases above 350°C. The constitutive equation of stress, strain and strain rate for 5A90 Al-Li alloy at any temperature is obtained by fitting the experimental data, which gave a good flow stress model for the FEM simulation of hot forming.

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Effect of Cyclic Predeformation on the Uniaxial Tensile Deformation Behavior of [017] Cu Single Crystals Oriented for Critical Double Slip

Metallurgical and Materials Transactions A ◽

10.1007/s11661-013-1625-y ◽

2013 ◽

Vol 44 (4) ◽

pp. 1631-1635 ◽

Cited By ~ 4

Author(s):

X. W. Li ◽

X. M. Wang ◽

W. W. Guo ◽

C. J. Qi ◽

Y. Yan

Keyword(s):

Single Crystals ◽

Deformation Behavior ◽

Tensile Deformation ◽

Uniaxial Tensile ◽

Tensile Deformation Behavior

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Temperature-Dependent Plastic Deformation Behavior of Cu-Ni Alloys: Coupled Influence of Stacking Fault Energy and Short Range Clustering

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.294.98 ◽

2019 ◽

Vol 294 ◽

pp. 98-103

Author(s):

Ying Wang ◽

Dong Han ◽

Xiao Wu Li

Keyword(s):

Plastic Deformation ◽

Deformation Behavior ◽

Short Range ◽

Stacking Fault ◽

Stacking Fault Energy ◽

Dynamic Strain ◽

Uniaxial Tensile ◽

Ni Alloys ◽

Plastic Deformation Behavior ◽

Different Temperatures

The uniaxial tensile tests were conducted at different temperatures to explore the coupled influence of stacking fault energy (SFE) and short-range clustering (SRC) on the plastic deformation behavior of Cu-Ni alloys. The results demonstrate that the ultimate tensile strength and uniform elongation decrease with increasing temperature due to the competitive influence of SFE and SRC. Dynamic strain aging (DSA) effect is observed at 200 and 250°C, and such an effect becomes more notable with increasing Ni content. The occurrence of DSA effect is thought to be caused by pinning of moving dislocations by SRC and diffusing solute atoms. The plastic deformation mechanisms for Cu-Ni alloys is mainly governed by wavy slip of dislocations at different temperatures, since the SFE of Cu-Ni alloys are very high especially at high temperatures, and the effect of SRC can be nearly ignored.

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Investigation of Tensile Deformation Behavior of 7075-T6 at Elevated Temperatures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.152-154.358 ◽

2012 ◽

Vol 152-154 ◽

pp. 358-363 ◽

Cited By ~ 1

Author(s):

Guo Wei Zhou ◽

Da Yong Li ◽

Ying Hong Peng

Keyword(s):

Deformation Behavior ◽

Elevated Temperatures ◽

Tensile Deformation ◽

Total Elongation ◽

Yield Function ◽

Uniaxial Tensile ◽

Tensile Deformation Behavior ◽

Ductile Mode ◽

Different Temperatures ◽

Increasing Temperature

Uniaxial tensile deformation behavior of 7075-T6 under three different strain rates (0.001, 0.004 and 0.03s-1) and five different temperatures (50, 100, 150, 200 and 250°C) is studied. The total elongation in uniaxial tension increases with increasing temperature in range of 50-200°C and decreases with increasing strain rate. But it drops sharply at 250°C. SEM observations of the fracture surface interpret the change of total elongation and show the fracture tends to transit from brittle mode to ductile mode with increasing temperature. The constitutive model and yield function related with temperature are established based on the experiment results.

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