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Download High Temperature Strain of Metals and Alloys: Physical by Valim Levitin PDF

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By Valim Levitin

Content material:
Chapter 1 Macroscopic features of pressure of steel fabrics at excessive Temperatures (pages 5–11):
Chapter 2 The Experimental gear and the in situ X?ray research process (pages 13–24):
Chapter three Structural Parameters in High?Temperature Deformed Metals (pages 25–42):
Chapter four actual Mechanism and Structural version of pressure at excessive Temperatures (pages 43–65):
Chapter five Simulation of the Evolution of Parameters in the course of Deformation (pages 67–81):
Chapter 6 High?temperature Deformation of Superalloys (pages 83–110):
Chapter 7 unmarried Crystals of Superalloys (pages 111–142):
Chapter eight High?temperature Deformation of a few Refractory Metals (pages 143–155):

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Additional resources for High Temperature Strain of Metals and Alloys: Physical Fundamentals

Sample text

The typical small-angle boundary in α-iron, which consists of pure screw dislocations, is shown in Fig. 11. Dislocations form a network with cells Fig. 9 Transmission electron micrographs showing dislocation sub-boundaries in niobium, which are formed in the steady-state creep. 2MPa. ×39 000. 2 Dislocation Structure Fig. 10 Transmission electron micrograph showing the dislocation sub-boundary in α-iron, which is formed in the steady-state creep. 0MPa. The first dislocation system is directed along [110] with b1 = a/2[111], the second along [1¯ 10] with b2 = a/2[1¯ 11].

This is the cause of an oscillating contrast in the dislocation images. 31 32 3 Structural Parameters in High-Temperature Deformed Metals Fig. 8 Subgrain dimensions versus applied stress. Nickel tested at 673K, steady-state stage. Errors of measurements are shown with vertical bars. ¯ The Burgers vectors were determined to be b1 = a/2[111] and b2 = a/2[111]. Atomic displacements are directed along the body diagonals of the elementary cubic cell. The typical small-angle boundary in α-iron, which consists of pure screw dislocations, is shown in Fig.

The typical Burgers vectors, slip planes and unit dislocation vectors have been selected for examination of sub-boundaries. 2. The angles < b1 ξ1 and < b2 ξ2 are not equal to 90◦ . This means that the dislocations of both systems contain screw components. Tab. 2 The crystallography of low-angle sub-boundaries. c. c. 7 Significance of the Stacking Faults Energy The processes of high-temperature strain are dependent upon the nature of a metal, especially, upon peculiarities of dislocations in its crystal lattice.

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