Evolution of plasticity, strain-rate sensitivity and the underlying deformation mechanism in Zn–22% Al during high-pressure torsion

2014 ◽  
Vol 75 ◽  
pp. 102-105 ◽  
Author(s):  
In-Chul Choi ◽  
Yong-Jae Kim ◽  
Byungmin Ahn ◽  
Megumi Kawasaki ◽  
Terence G. Langdon ◽  
...  
Keyword(s):  
High Pressure ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Deformation Mechanism ◽  
High Pressure Torsion ◽  
Rate Sensitivity

Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion

2015 ◽  
Vol 94 ◽  
pp. 44-47 ◽  
Author(s):  
In-Chul Choi ◽  
Dong-Hyun Lee ◽  
Byungmin Ahn ◽  
Karsten Durst ◽  
Megumi Kawasaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
High Pressure Torsion ◽  
Rate Sensitivity ◽  
Shear Yield

Enhanced strain rate sensitivity of Zr-based bulk metallic glasses subjected to high pressure torsion

2018 ◽  
Vol 747 ◽  
pp. 595-602 ◽  
Author(s):  
E.V. Boltynjuk ◽  
D.V. Gunderov ◽  
E.V. Ubyivovk ◽  
M.A. Monclús ◽  
L.W. Yang ◽  
...  
Keyword(s):  
High Pressure ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Metallic Glasses ◽  
High Pressure Torsion ◽  
Bulk Metallic Glasses ◽  
Rate Sensitivity ◽  
Enhanced Strain

Low Temperature Superplasticity in Ultrafine-Grained AZ31 Alloy

2018 ◽  
Vol 385 ◽  
pp. 59-64 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Pedro Henrique R. Pereira ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Room Temperature ◽  
High Strain ◽  
High Pressure Torsion ◽  
Rate Sensitivity ◽  
Az31 Alloy ◽  
Strain Rates ◽  
Ultrafine Grained

The mechanical behavior of an AZ31 magnesium alloy processed by high-pressure torsion (HPT) was evaluated by tensile testing from room temperature up to 473 K at strain rates between 10-5 – 10-2 s-1. Samples tested at room temperature and at high strain rates at 373 K failed without any plastic deformation. However, significant ductility, with elongations larger than 200%, was observed at 423 K and 473 K and at low strain rates at 373 K. The high elongations are attributed to a pronounced strain hardening and a high strain rate sensitivity. The results agree with reports for a similar alloy processed by severe plastic deformation. However, the level of flow stress is lower and the strain rate sensitivity and the elongations are larger than observed in this alloy processed by conventional thermo-mechanical processing.

scholarly journals Superplastic Behavior of Al-Mg-Mn Alloy: An Experimental & Numerical Investigation

2018 ◽  
Vol 778 ◽  
pp. 45-52
Author(s):  
Tayyaba Zaman ◽  
Rehan Qayyume ◽  
Amjad Ali ◽  
Shaheed Khan ◽  
Chaoli Maa
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Deformation Mechanism ◽  
Rate Sensitivity ◽  
Grain Boundary Sliding ◽  
Uniaxial Tensile ◽  
Sensitivity Index ◽  
Deformation Response ◽  
Surface Optical ◽  
Dominant Deformation Mechanism

Deformation response of Al-4.46Mg-0.48Mn alloy under uniaxial tensile loading was investigated at temperatures ranging from 400°C - 525°C and at strain rates of 3x10-3s-1, 1x 10-3s-1& 10-4s-1. The alloy exhibited a maximum elongation >480% at a strain rate of 10-3s-1and 525°C. At all conditions, the dominant deformation mechanism governing the superplastic deformation was investigated as a function of strain rate and temperature. The contributions of strain-rate sensitivity and strain hardening were analyzed in relation to the observed tensile ductility. The strain rate sensitivity index (m) and average activation energy (Q) values revealed that the dominant deformation mechanism is grain boundary sliding (GBS). The GBS phenomenon was further confirmed through high magnification examination of deformed surface. Optical microscopy (OM) and Scanning Electron Microscopy (SEM) showed that dynamic re-crystallization occurs during hot deformation of the alloy which causes reasonable enhancement of plasticity.

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