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through slips occurring with itself

Plate II, Fig. 4. Swedish Iron, much strained, seen under oblique illumination. 280 diameters.
(cropped, squared; levels adjusted : 0 1.50 255)
illustrating J(ames) A(lfred) Ewing (1855-1935 *) and Walter Rosenhain (1875-1934 *). “Experiments in Micro-metallurgy : — Effects of Strain. Preliminary Notice.” Proceedings of the Royal Society of London 65:414 (1899): 85-90
Pennsylvania State University copy, digitized Oct 17, 2013

“It is because the metal is an aggregate of irregular crystals that it is plastic as a whole, and is able to be deformed in any manner as a result of the slips occurring in individual crystals. Plasticity requires that each portion should be able to change its shape and its position. Each crystalline grain changes its shape through slips occurring within itself, and its position through slips occurring in other grains.”
p 90

posted same figure, scan of a different (Harvard) copy, a year ago at asfaltics, 601.

14 December 2014

deformation; iron; plasticity; slips; J. A. Ewing and W. Rosenhain, “Experiments in Micro-metallurgy:Effects of Strain” (1899)