Serrated Yield Behavior in Nial Single Crystal

1994 ◽  
Vol 364 ◽  
Author(s):  
J. M. Brzeski ◽  
J.E. Hack ◽  
R. Darolia
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Single Crystal ◽  
Single Crystals ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Fracture Behavior ◽  
Recent Model ◽  
Dynamic Strain ◽  
Yield Behavior

AbstractDynamic strain aging has been characterized in standard purity NiAl single crystals during compression testing. The activation energy for the process suggests carbon and oxygen as the most likely agents. Experimental data is compared with a recent model and implications for the fracture behavior of NiAl are considered.

Evaluation of activation energy for dynamic strain aging process in 316L(N)/316(N) SS weld joints

2008 ◽  
Vol 61 (4) ◽  
pp. 301-306 ◽  
Author(s):  
M. Shanmugavel ◽  
M. Nandagopal ◽  
R. Sandhya ◽  
K. Bhanu Sankara Rao ◽  
R. Gnanamoorthy
Keyword(s):  
Activation Energy ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Aging Process ◽  
Dynamic Strain ◽  
Weld Joints

scholarly journals Manifestations of dynamic strain aging in soft-oriented NiAl single crystals

1996 ◽  
Vol 27 (11) ◽  
pp. 3542-3557 ◽  
Author(s):  
M. L. Weaver ◽  
M. J. Kaufman ◽  
R. D. Noebe
Keyword(s):  
Single Crystals ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Dynamic Strain

Dynamic strain aging of Al 0.3 CoCrFeNi high entropy alloy single crystals

2015 ◽  
Vol 108 ◽  
pp. 80-83 ◽  
Author(s):  
Hiroyuki Y. Yasuda ◽  
Kyosuke Shigeno ◽  
Takeshi Nagase
Keyword(s):  
Single Crystals ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Dynamic Strain ◽  
High Entropy Alloy ◽  
High Entropy

Dynamic strain aging and serrated flow in MnO

1986 ◽  
Vol 1 (1) ◽  
pp. 124-129 ◽  
Author(s):  
K. C. Goretta ◽  
J. L. Routbort ◽  
T. A. Bloom
Keyword(s):  
Single Crystals ◽  
Yield Stress ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Dynamic Strain ◽  
Local Defect ◽  
Serrated Flow ◽  
Partial Pressures ◽  
Effects Of Aging ◽  
Segregation Of Impurities

The effects of aging on the upper yield stress τup and serrated flow have been studied in MnO single crystals at 900 °C for oxygen partial pressures ρO2 of 10−11 and 10−7 Pa. Aging initially increases τup as a consequence of segregation of aliovalent impurities to dislocations for both ρO2 values. For long aging times and ρO2 = 10-11 Pa, serrated flow accompanied by solute softening is observed. The data fit predictions of a Portevin-Le Chatelier model for serrations, but with impurity atmospheres causing softening instead of hardening. This is believed to result from changes in local defect equilibria caused by segregation of impurities with valences greater than two to dislocations.

Dynamic strain aging in Czochralski-grown silicon single crystals

1989 ◽  
Vol 117 ◽  
pp. 75-82 ◽  
Author(s):  
T.S. Gross ◽  
V.K. Mathews ◽  
R.J. De Angelis ◽  
K. Okazaki
Keyword(s):  
Single Crystals ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Dynamic Strain

Dynamic Strain Aging during the Plastic Flow of Metals

2007 ◽  
Vol 340-341 ◽  
pp. 823-828 ◽  
Author(s):  
Wei Guo Guo
Keyword(s):  
Experimental Data ◽  
Flow Stress ◽  
Plastic Flow ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Testing Machine ◽  
Strain Curve ◽  
Dynamic Strain ◽  
Polycrystalline Materials ◽  
Strain Rates

In the present paper, in order to better understand the third type “dynamic strain aging” occurring during the plastic flow of metals, the uniaxial compressive experimental data ever obtained in University of California, San Diego using an Instron servo-hydraulic testing machine and the Hopkinson technique are systematically analysed. These experimental data cover the plastic flow stress of several fcc, hcp, bcc polycrystalline materials and several alloys at a broad range of temperatures (77K – 1,100K) and strain rates (0.001/s – 10,000/s). In analysis, the appearing region of the “dynamic strain aging ” under different temperatures and strain rates are respectively plotted by the curves of stress vs temperature, and stress vs strain for fcc, hcp and bcc metals. The results show that: (1) this third type “dynamic strain aging ” occurs in all hcp, bcc and fcc polycrystalline or alloy materials, and there are different profiles of stress-strain curve; (2) the “dynamic strain aging ”occurs in a matching coincidence of the temperature and strain rate, its temperature region will shift to higher region with increasing strain rates; (3) bcc materials do not have an initial pre-straining strain as the onset of work-hardness rate change for the “dynamic strain aging ”; and (4) based on the explanations of dynamic strain aging with serration curves (Portevin-Lechatelier effect) and other explaining mechanisms of references, The mechanism of third DSA is thought as the rapid/continuous formation of the solute atmospheres at the mobile dislocation core by the pipe diffusion along vast collective forest dislocations to result in a continuous rise curve of flow stress. Finally, several conclusions are also presented.

Dynamic Strain Aging in a New Single Crystal Nickel-Based Superalloy (CMSX-4)

1995 ◽  
Vol 23 (2) ◽  
pp. 87 ◽  
Author(s):  
DR Petersen ◽  
RE Link ◽  
A Sengupta ◽  
SK Putatunda
Keyword(s):  
Single Crystal ◽  
Dynamic Strain Aging ◽  
Strain Aging ◽  
Dynamic Strain ◽  
Nickel Based Superalloy
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