Core–shell nanoscale precipitates in Al–0.06 at.% Sc microalloyed with Tb, Ho, Tm or Lu

Autor:	Matthew E. Krug, David N. Seidman, Alexandra Werber, David C. Dunand
Rok vydání:	2010
Předmět:	Lanthanide Materials science Number density Polymers and Plastics Precipitation (chemistry) Metals and Alloys Atom probe Microstructure Indentation hardness Electronic Optical and Magnetic Materials law.invention Crystallography law Ceramics and Composites Hardening (metallurgy) Atomic number
Zdroj:	Acta Materialia. 58:134-145
ISSN:	1359-6454
DOI:	10.1016/j.actamat.2009.08.074
Popis:	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 Al 3 (RE 1− x Sc x ) 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 Al 3 (Sc 1− x RE x ) 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4924ad97eb65b28fd565b4966425bdb0 https://doi.org/10.1016/j.actamat.2009.08.074 Zobrazit plný text záznamu Full Text from ScienceDirect