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On “Guinier-Preston zones in an aluminum-silver alloy”

✍ Scribed by S. Weissmann; D.F. Wriedt

Publisher
Elsevier Science
Year
1964
Weight
247 KB
Volume
12
Category
Article
ISSN
0001-6160

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✦ Synopsis

of the equilibrium a and y mixtures produced by long annealing at 400°C. It can be seen that the peaks resulting from the mergers in the tempered martensite pattern have roughly the same angular position as those in the pattern from cold-worked filings; i.e. peaks 3 and 4 approach the position of the h.c.p. 100 line, peaks 9 and 11 approach the h.c.p. 101 position, 19-21 approach h.c.p. 110 and 27-29 approach the h.c.p. 112 position. These shifts cannot be accounted for by peaks arising from either the a or y lines. This suggests that a crystal structure of completely different symmetry is produced by the "relaxation" process is apparently neither a conventional nucleation and growth reaction, because of the progressive nature of the peak shifts, nor a martensitic reversal of the martensite to the parent phase.

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