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Discussion of “Mechanisms of formation of θ precipitates in Al-4% Cu” by C. Laird and H. I. Aaronson

✍ Scribed by D. Vaughan; J.M. Silcock

Publisher
Elsevier Science
Year
1967
Weight
730 KB
Volume
15
Category
Article
ISSN
0001-6160

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✦ Synopsis

Discussion of "Mechanisms of formation of 8 precipitates in AM% Cu" by C. Laird and H. I. Aaronson* Recently Laird and Aaronson") examined the formation of 8 in thin foils of an Al-Cu alloy previously aged to form 8'. Only the orientations of 8 described by Guinierc2) and von Heimendahl and Wasserman(3) were observed. Whilst this may be true on ageing from 8' to 0 in thin foils, we have observed a further t This value was obtained by a linear extrapolation of the shear strengths of crystals of dilute solid solutions of beryllium in copper, (0) to the composition of the terminal solid solution at the aging temperature.

📜 SIMILAR VOLUMES

Interfacial structure of θ precipitates
Interfacial structure of θ precipitates in Al-4% Cu
✍ K.R. Kinsman; H.I. Aaronson; C. Laird 📂 Article 📅 1967 🏛 Elsevier Science ⚖ 811 KB

with the large peak (&,, = 3 x 10e3) observed by Weiner and GensameN in both cathodically-and thermally-charged specimens. It should be mentioned that our results are consistent with Heller's(\*) ideas of quantum mechanical tunneling of hydrogen atoms, for we are at a frequency where the diffusive