Thermally activated dislocation movement at plastic deformation

1981 ◽  
Vol 31 (2) ◽  
pp. 142-156 ◽  
Author(s):  
B. Wielke
Keyword(s):  
Plastic Deformation ◽  
Thermally Activated ◽  
Dislocation Movement

Some aspects of plastic deformation theory with an account for thermally activated dislocation transformations

1976 ◽  
Vol 38 (2) ◽  
pp. 653-662 ◽  
Author(s):  
B. A. Greenberg ◽  
M. A. Ivanov ◽  
Yu. N. Gornostirev ◽  
L. E. Karkina
Keyword(s):  
Plastic Deformation ◽  
Deformation Theory ◽  
Thermally Activated

Effect of Plastic Deformation on the Isothermal FCC/HCP Phase Transformation during Aging of Co-27Cr-5Mo-0.05C Alloy

2007 ◽  
Vol 560 ◽  
pp. 23-28
Author(s):  
A. Mani-Medrano ◽  
Armando Salinas-Rodríguez
Keyword(s):  
Plastic Deformation ◽  
Martensitic Transformation ◽  
Tensile Deformation ◽  
Internal Stresses ◽  
X Ray Diffraction ◽  
Thermally Activated ◽  
Prior Plastic Deformation ◽  
Last Stage ◽  
Isothermal Martensitic Transformation

The effects of tensile deformation on the amount of hcp phase formed during a 3 hour isothermal aging at 800 °C is studied using in-situ X-ray diffraction and scanning electron microscopy. It is shown that the start of the isothermal martensitic transformation during aging of this material is delayed by prior plastic deformation. Nevertheless, the total amount of hcp phase present in the microstructure at the beginning of aging increases at a continuously decreasing rate due to stress-assisted transformation. This behavior is attributed to the relieving of internal stresses produced by plastic deformation prior to aging. Finally, during the last stage of aging, the amount of hcp phase in the microstructure increases as a result of isothermal martensitic transformation. It is suggested that the presence of mechanically-induced hcp phase during aging inhibits the thermally activated nucleation process that leads to the isothermal martensitic transformation.

The Mechanical Properties of Si+ and Pb+ Implanted Al

1983 ◽  
Vol 27 ◽  
Author(s):  
P.B. Madakson
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Wear Resistance ◽  
Precipitation Hardening ◽  
Surface Oxidation ◽  
Linear Increase ◽  
Commercially Pure ◽  
Dislocation Movement ◽  
Dose Dependent ◽  
Al Matrix

ABSTRACTCommercially pure Al was implanted with 300 keV Si+ and 200 keV Pb+ to doses of between l011 and 1017 ions/cm2. Changes in friction, wear, oxidation and hardness were investigated. Silicon increased the hardness and wear resistance of Al and significantly decreased friction and the oxidation of the implanted surface. These changes were observed to be almost proportional to the implanted dose. The implantation of Pb+ resulted in a linear increase in hardness and a decrease in surface oxidation with dose. Friction decreased and wear resistance increased but the changes were not dose dependent. The implantation of Si+ did not significantly alter the distribution of impurities, such as Fe and Cu within the Al matrix, but Pb+ resulted in a diffusion of Fe to the implanted surface. Formation of precipitates was observed and the improvements in the surface properties studied are considered to result from precipitation hardening, which involves the impediment of dislocation movement by the precipitates during plastic deformation of the implanted Al.

Thermally activated mechanisms of plastic deformation of single crystals of the disordered alloy Ni3Fe

1978 ◽  
Vol 21 (7) ◽  
pp. 929-932
Author(s):  
V. V. Starenchenko ◽  
V. S. Kobytev ◽  
�. V. Kozlov ◽  
L. E. Popov
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Thermally Activated ◽  
Alloy Ni3fe ◽  
Mechanisms Of Plastic Deformation ◽  
Disordered Alloy

scholarly journals Atomistic Simulation of Microstructural Evolution of Ni50.8Ti Wires during Torsion Deformation

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 92
Author(s):  
Shan Liu ◽  
Yao Lin ◽  
Tao Wu ◽  
Guangchun Wang
Keyword(s):  
Plastic Deformation ◽  
Martensitic Transformation ◽  
Microstructural Evolution ◽  
Grain Morphology ◽  
Large Degree ◽  
Atomic Scale ◽  
Main Mechanism ◽  
Grain Rotation ◽  
Dislocation Movement ◽  
Torsion Deformation

To explore the microstructural evolution of Ni50.8Ti wires during torsion deformation, single and polycrystalline models with various grain sizes (d = 9 nm, 5.6 nm, and 3.4 nm) were established on an atomic scale to explore their grain morphology evolution, stress-induced martensitic transformation, and dislocation movement. The results indicated that the grains were rotated and elongated to form long strips of grains during the torsion simulation. With the increase in torsion deformation, the elongated grains were further split, forming smaller grains. Stress-induced martensitic transformation took place and the martensite preferentially nucleated near the grain boundary, resulting in the formation of 30% austenites and 50% martensites. Additionally, a certain number of dislocations were generated during the torsion simulation. Under a low degree of torsion deformation, the main mechanism of plastic deformation was dislocation movement, while with a large degree of torsion deformation, the main mechanism of plastic deformation was grain rotation.

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