Core–shell nanoscale precipitates in Al–0.06 at.% Sc microalloyed with Tb,Ho, Tm or Lu |
| |
| Authors: | Matthew E Krug Alexandra Werber David C Dunand David N Seidman |
| |
| Affiliation: | 1. Northwestern University, Materials Science and Engineering, 2220 Campus Drive, Northwestern University, Evanston, IL 60208-3108, USA;2. Universität Karlsruhe, Kaiserstraße 12, 76131 Karlsruhe, Germany;3. Northwestern Center for Atom-Probe Tomography, 2220 Campus Drive, Evanston, IL 60208-3108, USA |
| |
| Abstract: | The age-hardening response at 300 °C of Al–0.06Sc–0.02RE (at.%, with RE = Tb, Ho, Tm or Lu) is found to be similar to that of binary Al–0.08Sc (at.%), except that a shorter incubation period for hardening is observed, which is associated with nanoscale RE-rich Al3(RE1?xScx) precipitates. In addition, Al–0.06Sc–0.02Tb (at.%) has a much lower peak microhardness than that of Al–0.08Sc (at.%) due to the small solubility of Tb in α-Al(Sc). Peak-age hardening occurs after 24 h, and is associated with a high number density of nanoscale Sc-rich Al3(Sc1?xREx) precipitates. Analysis by three-dimensional local-electrode atom-probe tomography shows that x increases with increasing atomic number, and that the REs partition to the core of the precipitates. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
