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

By Valim Levitin

Content material:
Chapter 1 Macroscopic features of pressure of metal fabrics at excessive Temperatures (pages 5–11):
Chapter 2 The Experimental apparatus and the in situ X?ray research method (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

Example text

One can often observe a sequence of dislocation lines which are pressed to the sub-boundary and these can enter the boundary. 5 Dislocations inside Subgrains Some dislocations, which are observed in specimens after the high-temperature deformation, are not associated in sub-boundaries. e. α-iron, vanadium, and niobium. The slip plane is generally of the {110} type. Screw dislocations are observed, as well 35 36 3 Structural Parameters in High-Temperature Deformed Metals Fig. 1MPa. s, Screw dislocations; j, jogs; h, helicoids; l, vacancy loops.

4. n is the number of measurements of z0 values. 95 are also shown in the table. The two values are close to each other. 2) is of great importance for our understanding of the physical mechanism of high-temperature deformation. Fig. 8MPa, n = 185. 37 38 3 Structural Parameters in High-Temperature Deformed Metals Tab. 4 Comparison of average distances z0 between jogs ¯ between in mobile dislocations and of average distances λ subgrain dislocations. n is the number of measurements. 5. Dislocation densities during the high-temperature deformation for the metals under study are estimated to be from 1011 m−2 to 1012 m−2 .

Most of the dislocations in specimens after hightemperature tests are associated in sub-boundaries. 2 Dislocation Structure Tab. 2 Average substructure parameters in niobium, vanadium and α-iron at the steady-state creep. 9 Fe dislocations are situated at an equal distance from each other. It follows from the results of the Burgers vector determinations and from the repeating structural configurations that the parallel sub-boundary dislocations have the same sign. Two intersected dislocation systems are often observed inside sub-boundaries.

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