REQUIREMENTS FOR ACHIEVING HIGH-STRAIN-RATE SUPERPLASTICITY IN CAST-ALUMINUM ALLOYS

Authors
BERBON PB FURUKAWA M HORITA Z NEMOTO M TSENEV NK VALIEV RZ LANGDON TG
Citation
Pb. Berbon et al., REQUIREMENTS FOR ACHIEVING HIGH-STRAIN-RATE SUPERPLASTICITY IN CAST-ALUMINUM ALLOYS, Philosophical magazine letters, 78(4), 1998, pp. 313-318
Citations number
22
Categorie Soggetti
Physics, Condensed Matter
Journal title
Philosophical magazine letters → ACNP
ISSN journal
09500839
Volume
78
Issue
4
Year of publication
1998
Pages
313 - 318
Database
ISI
SICI code
0950-0839(1998)78:4<313:RFAHSI>2.0.ZU;2-M
Abstract
Equal-channel angular (ECA) pressing has been used to introduce a very small grain size into a commercial cast Al-Mg-Li-Zr alloy. Tensile te sting reveals the potential for achieving superplastic ductilities in this alloy at very high strain rates (greater than 10(-2) s(-1)) but e xperiments show that this potential is realized only if a sufficiently high strain is introduced during the ECA pressing such that the micro structure is homogeneous and consists of an array of grains having lar ge-angle grain boundaries.