Read e-book online Superplasticity and Grain Boundaries in Ultrafine-Grained PDF

By A L Zhilyaev, A I Pshenichnyuk

ISBN-10: 085709100X

ISBN-13: 9780857091000

Superplasticity is a kingdom within which strong crystalline fabrics, corresponding to a few fine-grained metals, are deformed well past their traditional verge of collapse. The phenomenon is of value in methods comparable to superplastic forming which permits the manufacture of advanced, high quality parts in such parts as aerospace and biomedical engineering.  Superplasticity and grain obstacles in ultrafine-grained materials discusses a few difficulties linked to grain barriers in steel polycrystalline fabrics. The authors discover the position of grain barriers in procedures resembling grain boundary diffusion, leisure and grain growth.  Chapters concentrate on the formation and evolution of the microstructure, texture and ensembles of grain obstacles in fabrics produced by means of serious plastic deformation.  Written by way of major specialists within the field, Superplasticity and grain limitations in ultrafine-grained materials significantly advances our realizing of this crucial occurance. 

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Extra resources for Superplasticity and Grain Boundaries in Ultrafine-Grained Materials (Woodhead Publishing in Materials)

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40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. , Izv. VUZ, Fizika, 1991, No. , Phil. , R. Soc. London, A 288, 1978, 121–146. , 1994, vol. 42, No. 8, 2617–2622. , J. Appl. , 1993, vol. 74, No. 8, 4972–4982. F. , 1973, vol. 21, 149–163. , Creep of crystals. The mechanism of deformation of metals, ceramics and minerals at high temperatures, Mir, Moscow, 1987. , Phil. Mag. A, 1994, vol. 70, 109–143. , Metall. , 1972, 3, 833–842. , Advanced Materials ‘93, III / B: Composites, grain boundaries and nanophase Materials, ed.

Experiments were carried out to determine the distribution of the dihedral angles at triple junctions belonging to the shear band and situated outside the band [39]. , they are close to equilibrium configurations. e. their dihedral angles show a distinctive tendency to increasing (equal to p). In addition to this, in investigating grain boundary sliding in tricrystals [44] it was found that the ‘straightening’ of the triple junctions takes place as a result of local migration (buckling) of one of the boundaries (with the maximum shear stresses acting in the plane of the boundary) to the rearrangement of the configuration of the triple junctions which ensures compatibility of shear at two out of three boundaries forming the given junction.

1 shows the data on special misorientations only up to Σ = 25. 1, are not equivalent. The columns 1 and 2 contain equivalent misorientations having however different representation. This also refers to the columns 3 and 4. 1. 0 Characteristics of grain boundary ensembles 37 time, the pairs of the misorientations 1, 2 are not equivalent to the pairs 3, 4; they represent different coincident-site lattices. Two equivalent misorientations of the coincident-site lattices are connected together by rotation through 180° around the [010] angle.

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Superplasticity and Grain Boundaries in Ultrafine-Grained Materials (Woodhead Publishing in Materials) by A L Zhilyaev, A I Pshenichnyuk


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