Low temperature superplasticity of the ECAP Al7075-based alloy

0499911 - FZÚ 2019 RIV RU eng J - Journal Article
Málek, Jiří - Molnárová, Orsolya - Lejček, Pavel
Low temperature superplasticity of the ECAP Al7075-based alloy.
Letters on materials. Roč. 8, Dec (2018), s. 549-553. ISSN 2218-5046
R&D Projects: GA ČR GBP108/12/G043; GA MŠMT LM2015087
Institutional support: RVO:68378271
Keywords : Al7075 alloy * ECAP * low temperature superplasticity * microstructure investigation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

A sub-microcrystalline structure was prepared in the Al7075 alloy modified by the addition of 0.2 wt. % Sc and 0.11 wt. % Zr using the equal channel angular pressing technique (ECAP). The ECAP temperature influenced not only the grain size but also its stability at elevated temperatures and thus the deformation behaviour. Higher ECAP temperature (170 °C) resulted in slightly coarser grains with a better temperature stability. High strain rate superplasticity was observed in this material at temperatures above 450 °C. Lower ECAP temperature (120 °C) resulted in finer grains, however, a grain growth started already at 300 °C. Low temperature superplasticity with elongation exceeding 300 % was observed in this material already at 200 °C.

Permanent Link: http://hdl.handle.net/11104/0292101