caa a22 4500 528785915 20190713030955.0 cr unu---uuuuu 180924s2015 xx s 000 0 eng 10.3929/ethz-b-000103476 doi 10.1038/ncomms8748 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/103476 Zou Yu Ultrastrong ductile and stable high-entropy alloys at small scales [Elektronische Daten] [Yu Zou, Huan Ma, Ralph Spolenak] Nat Commun Open access ethresearch Refractory high-entropy alloys (HEAs) are a class of emerging multi-component alloys, showing superior mechanical properties at elevated temperatures and being technologically interesting. However, they are generally brittle at room temperature, fail by cracking at low compressive strains and suffer from limited formability. Here we report a strategy for the fabrication of refractory HEA thin films and small-sized pillars that consist of strongly textured, columnar and nanometre-sized grains. Such HEA pillars exhibit extraordinarily high yield strengths of ∼10 GPa—among the highest reported strengths in micro-/nano-pillar compression and one order of magnitude higher than that of its bulk form—and their ductility is considerably improved (compressive plastic strains over 30%). Additionally, we demonstrate that such HEA films show substantially enhanced stability for high-temperature, long-duration conditions (at 1,100 °C for 3 days). Small-scale HEAs combining these properties represent a new class of materials in small-dimension devices potentially for high-stress and high-temperature applications. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Ma Huan joint author Spolenak Ralph joint author Nature Communications London : Nature Publishing Group 6, p. 7748 2041-1723 http://hdl.handle.net/20.500.11850/103476 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/103476 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 100 1- Zou Yu ETHRESEARCH 700 1- Ma Huan joint author ETHRESEARCH 700 1- Spolenak Ralph joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 6, p. 7748 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access