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By Michael Anthony Nastasi; Don M Parkin; H Gleiter; North Atlantic Treaty Organization. Scientific Affairs Division

ISBN-10: 0792321952

ISBN-13: 9780792321958

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Extra info for Mechanical properties and deformation behavior of materials having ultra-fine microstructures : [proceedings of the NATO Advanced Study Institute on Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures, Porto Novo,

Example text

It was seen clearly that after the first pass, the initial equiaxed grains of the as-received sample, with an average size of ~30 µm, were elongated along a direction 30° to the longitudinal axis [Fig. 7(b)]. The second pass resulted in smaller and more irregular equiaxed grains with dim grain boundary contours, compared with the as-received microstructure [Fig. 7(c)]. Further passes brought similar morphological changes: with an odd number of passes, the grains were severely elongated along in a direction Inclined at 30° to the longitudinal axis and the grains were restored to an equiaxed shape with the subsequent even number of passes [121].

27 Tensile stress–strain curves of Cu samples: coarse-grained (1), consolidated from powder by HPT (2), HPT strained, 5 revolutions (3). 2%Sc alloy, processed through HPT and ECAP. The grain size produced by HPT is ~150 nm while that produced in the same alloy by ECAP is ~200 nm. The ultimate tensile strength and the elongation to failure of HPT samples in all three orthogonal directions are close to the values obtained in material processed through ECAP (Fig. 28). The closeness of these results (notwithstanding the ~50 nm difference in grain size) is remarkable.

Fig. 26 Variation of the Vickers microhardness with position on the disk for pure Cu with and without HPT and with HPT followed by short-term anneals of 15 s and 3 min at 473 K [175]. 5 Tensile behavior Many reports describe superplastic behavior of aluminum-based alloys processed by ECAP [176,177]. In contrast, very limited attention has been paid to a study of the superplastic response of materials processed by HPT [57]. This lacuna is due to the samples produced by HPT being in the form of thin disks with diameters of ~1 cm and difficulties in the preparation of miniature samples for tensile testing.

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Mechanical properties and deformation behavior of materials having ultra-fine microstructures : [proceedings of the NATO Advanced Study Institute on Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures, Porto Novo, by Michael Anthony Nastasi; Don M Parkin; H Gleiter; North Atlantic Treaty Organization. Scientific Affairs Division


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