𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Interfacial structure of θ precipitates in Al-4% Cu

✍ Scribed by K.R. Kinsman; H.I. Aaronson; C. Laird

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

No coin nor oath required. For personal study only.

✦ Synopsis

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 jump rate m t,unneling rate, so a hydrogen Snoek peak should be observable. More experiments at lower frequencies are needed to prove or disprove his tunneling concept.

The author wishes to thank W. Oates for help in a,11 phases of this work and also H. Stanton for help in regard to thermal-charging the specimens. Professor D. N. Beshers kindly commented on the original manuscript, and Professor C. Elbaum kindly commented on a later version.

📜 SIMILAR VOLUMES

Planar defects within θ precipitates in
Planar defects within θ precipitates in an Al-3.93 WT.% Cu alloy
✍ R. Sankaran; C. Laird 📂 Article 📅 1977 🏛 Elsevier Science ⚖ 997 KB

defects such as antiphase domain boundaries, twin boundaries. stacking faults and dislocation boundaries have been observed within the 0 precipitates in an N-3.93 wt. 0, Cu alloy. The structures of these boundaries have been analysed and precipitate coalescence has been taken to k the predominant me

The precipitation of θ' at high-angle bo
The precipitation of θ' at high-angle boundaries in an Al-Cu alloy
✍ D Vaughan 📂 Article 📅 1970 🏛 Elsevier Science ⚖ 678 KB

In the AI-Cu system precipitates of the intermediate 0' phase generally nualeate at low-angle boundaries and precipitates of the equilibrium 0 phase form at high-angle boundaries. A few exceptions oocur where 8' precipitates form at high-angle boundaries and these have been studied by transmission e

Discussion of “Mechanisms of formation o
Discussion of “Mechanisms of formation of θ precipitates in Al-4% Cu” by C. Laird and H. I. Aaronson
✍ D. Vaughan; J.M. Silcock 📂 Article 📅 1967 🏛 Elsevier Science ⚖ 730 KB

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 Wasserm

Dissolution of θ phase in Al-5% Cu
Dissolution of θ phase in Al-5% Cu
✍ M.G Hall; C.W Haworth 📂 Article 📅 1970 🏛 Elsevier Science ⚖ 958 KB

Large Widmanstatten particles of 0 phase in an Al-5 % Cu alloy were grown by annealing for long times at 464°C. Subsequent annealing treatments at 541°C or 509°C resulted in the partial dissolution of these particles. The resultant distribution of copper in the matrix in the neighbourhood of the par