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Planar defects within θ precipitates in an Al-3.93 WT.% Cu alloy

✍ Scribed by R. Sankaran; C. Laird

Publisher
Elsevier Science
Year
1977
Weight
997 KB
Volume
25
Category
Article
ISSN
0001-6160

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✦ Synopsis

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 mechanism of their formation.

R&sum&-On a observe des dtfauts plans tels que parois d'antiphase, joints de macle. defauts d'empilement et parois de dislocations a l'interieur de precipitts tl dam un alliage Al-3.9300 Cu (en massi. On a etudit la structure de ces joints et l'on considtre que la coalescence d-s prtcipitis est Ie mecanisrze principal de leur formation. Zusammenfassung-Planare Defekte, wie Antiphasengrenzen, Zwillingsgrenzen, Stapelfehler und Verserzungskorngrenzen wurden innerhalb yen Musscheidungen in einer U-3.93 Gew.-O; Cu-Legierung beobachtet. Die Strukturen dieser Grenztllchen wurden analysiert : der vorwiegende Bildungsmechanismus wird gesehen in dem Zusammenwachsen der Ausscheidungen.

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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