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

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

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

On the Effect of Strain Rate and Temperature on the Yield Strength Anomaly in L21-structured Fe2AlMn

2008 ◽  
Vol 1128 ◽  
Author(s):  
Markus W. Wittmann ◽  
Janelle M. Chang ◽  
Yifeng Liao ◽  
Ian Baker
Keyword(s):  
Yield Strength ◽  
Strain Rate ◽  
Single Crystals ◽  
Yield Stress ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Temperature Range ◽  
Effects Of Temperature ◽  
Increasing Temperature

AbstractThe effects of strain rate and temperature on the yield strength of near-stoichiometric Fe2AlMn single crystals were investigated. In the temperature range 600-800K the yield stress increased with increasing temperature, a response commonly referred to as a yield strength anomaly. No strain rate sensitivity was observed below 750K, but at higher temperatures the yield stress increased with increasing strain rate. Possible mechanisms to explaining the effects of temperature and strain rate are discussed.

Influence of strain rate on the characteristics of a magnesium alloy processed by high-pressure torsion

2011 ◽  
Vol 528 (10-11) ◽  
pp. 3601-3608 ◽  
Author(s):  
Pauline Serre ◽  
Roberto B. Figueiredo ◽  
Nong Gao ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
High Pressure Torsion

scholarly journals Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

2014 ◽  
Vol 372 (2015) ◽  
pp. 20130216 ◽  
Author(s):  
Srihari Kurukuri ◽  
Michael J. Worswick ◽  
Dariush Ghaffari Tari ◽  
Raja K. Mishra ◽  
Jon T. Carter
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Compressive Loading ◽  
Rate Sensitivity ◽  
Strain Response ◽  
Basal Texture ◽  
Stress Strain ◽  
Strong Basal Texture ◽  
Tension Compression Asymmetry

The constitutive response of a commercial magnesium alloy rolled sheet (AZ31B-O) is studied based on room temperature tensile and compressive tests at strain rates ranging from 10 −3 to 10 3  s −1 . Because of its strong basal texture, this alloy exhibits a significant tension–compression asymmetry (strength differential) that is manifest further in terms of rather different strain rate sensitivity under tensile versus compressive loading. Under tensile loading, this alloy exhibits conventional positive strain rate sensitivity. Under compressive loading, the flow stress is initially rate insensitive until twinning is exhausted after which slip processes are activated, and conventional rate sensitivity is recovered. The material exhibits rather mild in-plane anisotropy in terms of strength, but strong transverse anisotropy ( r -value), and a high degree of variation in the measured r -values along the different sheet orientations which is indicative of a higher degree of anisotropy than that observed based solely upon the variation in stresses. This rather complex behaviour is attributed to the strong basal texture, and the different deformation mechanisms being activated as the orientation and sign of applied loading are varied. A new constitutive equation is proposed to model the measured compressive behaviour that captures the rate sensitivity of the sigmoidal stress–strain response. The measured tensile stress–strain response is fit to the Zerilli–Armstrong hcp material model.

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