Serration behavior and shear band characteristics during tensile deformation of an ultrafine-grained 5024 Al alloy

2014 ◽  
Vol 616 ◽  
pp. 189-195 ◽  
Author(s):  
M. Komarasamy ◽  
R.S. Mishra
Keyword(s):  
Shear Band ◽  
Tensile Deformation ◽  
Al Alloy ◽  
Ultrafine Grained ◽  
Serration Behavior

The effect of strain rates on tensile deformation of ultrafine-grained copper

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744014
Author(s):  
M. Li ◽  
Q. W. Jiang
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Room Temperature ◽  
Tensile Deformation ◽  
Strain Rates ◽  
Roll Bonding ◽  
Fracture Elongation ◽  
Tensile Deformation Behavior ◽  
Ultrafine Grained ◽  
Flow Stress Level

Tensile deformation behavior of ultrafine-grained (UFG) copper processed by accumulative roll-bonding (ARB) was studied under different strain rates at room temperature. It was found that the UFG copper under the strain rate of 10[Formula: see text] s[Formula: see text] led to a higher strength (higher flow stress level), flow stability (higher stress hardening rate) and fracture elongation. In the fracture surface of the sample appeared a large number of cleavage steps under the strain rate of 10[Formula: see text] s[Formula: see text], indicating a typical brittle fracture mode. When the strain rate is 10[Formula: see text] or 10[Formula: see text] s[Formula: see text], a great amount of dimples with few cleavage steps were observed, showing a transition from brittle to plastic deformation with increasing strain rate.

Tensile Deformation and Fracture in a Bulk Nanostructured Al-5083/SiCp Composite at Elevated Temperatures

2007 ◽  
Vol 29-30 ◽  
pp. 245-248
Author(s):  
F. Tang ◽  
B.Q. Han ◽  
Masuo Hagiwara ◽  
Julie M. Schoenung
Keyword(s):  
Elevated Temperatures ◽  
Tensile Deformation ◽  
Tensile Tests ◽  
Nanostructured Composite ◽  
Sic Particles ◽  
Deformation And Fracture ◽  
Ultrafine Grained ◽  
Al 5083 Alloy

An ultrafine-grained Al-5083 alloy reinforced with 5 vol.% nano-sized β-SiC particles was fabricated with a powder cryomilling and consolidation technique. Tensile tests were conducted at temperatures from 298 to 773 K for this composite. The mechanisms for deformation and fracture of this nanostructured composite at various temperatures are discussed.

Thermal stability in bulk cryomilled ultrafine-grained 5083 Al alloy

2006 ◽  
Vol 37 (3) ◽  
pp. 721-730 ◽  
Author(s):  
Indranil Roy ◽  
Manish Chauhan ◽  
Farghalli A. Mohamed ◽  
Enrique J. Lavernia
Keyword(s):  
Thermal Stability ◽  
Al Alloy ◽  
Ultrafine Grained ◽  
5083 Al Alloy

scholarly journals Strain Rate Contribution due to Dynamic Recovery of Ultrafine-Grained Cu–Zr as Evidenced by Load Reductions during Quasi-Stationary Deformation at 0.5 Tm

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1150 ◽  
Author(s):  
Wolfgang Blum ◽  
Jiři Dvořák ◽  
Petr Král ◽  
Philip Eisenlohr ◽  
Vaclav Sklenička
Keyword(s):  
Strain Rate ◽  
Dynamic Recovery ◽  
Tensile Deformation ◽  
Coarse Grained ◽  
Internal Stresses ◽  
Back Flow ◽  
Stationary Rate ◽  
Ultrafine Grained ◽  
High Fraction ◽  
And Storage

During quasi-stationary tensile deformation of ultrafine-grained Cu-0.2 mass%Zr at 673 K and a deformation rate of about e - 4 / s load changes were performed. Reductions of relative load by more than about 25% initiate anelastic back flow. Subsequently, the creep rate turns positive again and goes through a relative maximum. This is interpreted by a strain rate component ϵ ˙ - associated with dynamic recovery of dislocations. Back extrapolation indicates that ϵ ˙ - contributes the same fraction of ( 20 ± 10 ) % to the quasi-stationary strain rate that has been reported for coarse-grained materials with high fraction of low-angle boundaries; this suggests that dynamic recovery of dislocations is generally mediated by boundaries. The influence of anelastic back flow on ϵ ˙ - is discussed. Comparison of ϵ ˙ - to the quasi-stationary rate points to enhancement of dynamic recovery by internal stresses. Subtraction of ϵ ˙ - from the total rate yields the rate component ϵ ˙ + related with generation and storage of dislocations; its activation volume is in the order expected from the classical theory of thermal glide.

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