caa a22 4500 463227859 CHVBK 20180405153232.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-007-1998-7 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1998-7 High temperature phase stabilized microstructure in Mg-Zn-Sn alloys with Y and Sb additions [Elektronische Daten] [Anton Gorny, Menahem Bamberger, Alexander Katsman] Mg-Zn-Sn alloys exhibit poor structural stability at elevated temperatures that restricts utilization of these alloys. Small additions of alloying elements forming high temperature phases (HTP) were used to improve the structural stability of the Mg-Zn-Sn alloy. The main goal of this work was to investigate the microstructure evolution of the Mg-Zn-Sn-alloy with additions of Y and Sb during a wide scope of heat treatments, and to elucidate peculiarities of an HTP-stabilized microstructure. In order to clarify the substructure features and phase precipitation after each step of the heat treatment, XRD, TEM, SEM and EDS analyses were applied. It was found that in the dendrite structure formed during solidification, HTP-particles are concentrated in the inter-dendrite regions. Solution treatment of the as-cast structure at 440°C for 96h lead to the formation of α-Mg grains of 50-80μm in diameter with a characteristic substructure. The presence of HTP-particles prevented dislocation recovery and movement of dislocation walls during solution treatment, and by this way restricted annihilation of grain boundaries between dendrites of close orientation, and lead to the formation of a substructure with sub-grains of 20-30μm. The sub-grain boundaries are pinned by HTP-particles and are strengthened by the MgZn2 and Mg2Sn binary precipitates during aging. Precipitate depleted zones formed near grain- and sub-grain boundaries during aging were bordered by a "crust” of enlarged binary particles. Such pinned sub-grain microstructure provides a high structural stability of the alloys at elevated temperatures. Springer Science+Business Media, LLC, 2007 Gorny Anton Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut Bamberger Menahem Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut Katsman Alexander Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10014-10022 0022-2461 42:24<10014 2007 42 10853 https://doi.org/10.1007/s10853-007-1998-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1998-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gorny Anton Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut NATIONALLICENCE 700 1- Bamberger Menahem Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut NATIONALLICENCE 700 1- Katsman Alexander Department of Materials Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10014-10022 0022-2461 42:24<10014 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer