Bulk Nanostructured Materials with Multifunctional - download pdf or read online

By I. Sabirov, N.A. Enikeev, M.Yu. Murashkin, R.Z. Valiev

This booklet provides a multifunctional method of the layout of bulk nanostructured metals via serious plastic deformation (SPD). fabrics engineering has typically concerned determining an appropriate fabric for a given software. although, glossy engineering often calls for fabrics with a suite of multifunctional, usually conflicting homes: superior mechanical homes must be mixed with stronger actual (electrical, magnetic, etc.) and/or chemical (corrosion resistance, biocompatibility) homes. So disparate fabrics homes have to be engineered and optimized concurrently. those standards have created a paradigm shift during which the classical fabrics choice process is changed by way of layout of fabric microstructures to accomplish sure functionality necessities, topic to constraints on person homes equivalent to power, conductivity, and corrosion resistance. Written through researchers on the vanguard of this new fabrics layout technique, the current quantity offers a entire advent to multifunctional layout of bulk nanostructured fabrics, with purposes starting from hydrogen garage to building engineering.

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Acta Mater. 58, 2610 (2010) 40. : Plasticity and grain boundary diffusion at small grain sizes. Adv. Eng. Mater. 12, 758 (2010) 41. : Deformation twinning in nanocrystalline materials. Prog. Mater Sci. 57, 1–62 (2012) 42. : Simultaneously increasing the ductility and strength of ultra-fine-grained pure copper. Adv. Mater. 18, 2949 (2006) 43. : The diffraction submicroscopic analysis of the submicrocrystal and nanocrystal structure of constructional carbon steels after equal channel angle pressing and further deformation.

The numerical values for the constants were taken from the earlier report [20]. 1. After HPT, a homogeneous UFG structure was formed with mainly high-angle misorientations. Therefore, for the HPT sample, it is reasonable to neglect the contribution of low-angle grain boundaries. The analysis of mechanical test data shows that the presence of substructure and the non-equilibrium state of grain boundaries contributes more strongly to the yield stress of SPD-processed Ni than the strength calculated according to the Hall–Petch rule for a material with the given grain size.

3. It was also determined that HPT processing has a visible effect on the value of the crystal lattice parameter α of Al alloys. 0003 Å, which results from the formation of Mg segregations at grain boundaries [12, 13]. Fig. 3 A typical TEM dark-field image of the UFG 1570 alloy with a corresponding SAED (a), a bright-field image (b). 4 shows the results of mechanical testing of the 1570 and 7475 alloys. It can be seen that the UFG alloys processed by HPT at room temperature demonstrate record strength that more than twice exceeds the level of strength of the material subjected to standard hardening.

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