STRENGTH OF COMMERCIAL ALUMINUM ALLOYS AFTER EQUAL CHANNEL ANGULAR PRESSING (ECAP) AND POST-ECAP PROCESSING

Maxim Y. Murashkin 3,  Mikhail V. Markushev 4,  Yulia Ivanisenko 2,  Ruslan Z. Valiev 1

1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K.Marks St.12, Ufa 450000, Russian Federation
2. Forschungszentrum Karlsruhe, Institute of Nanotechnology, P.O.B. 3640, Karlsruhe D-76021, Germany
3. Institute of Physics of Advaced Materials, Ufa State Aviation Technical University (IPAM USATU), 12 K. Marx st., Ufa 450000, Russian Federation
4. Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa, Russian Federation

Abstract

Effect of thermomechanical treatment (TMT) that includes equal channel angular pressing (ECAP), further annealing, aging and rolling on ambient temperature tensile strength of heat hardenable and non-heat hardenable 6061 (Al0.9Mg0.7Si) and 1560 (Al6.5Mg0.6Mn) alloys has been investigated.
It has been stated that even after ECAP the alloys strength exceeds values observed after conventional strengthening processing.
Post-ECAP annealing of the 1560 alloy at temperatures above 2000C led to strength decrease and ductility enhancement. The strength of 6061 alloy can be additionally increased by TMT involving solution treatment before ECAP and post-deformation aging. Basing on the data of differential scanning calorimetry and dependences of hardness on temperature and time of annealing, optimal regime of the alloy post-ECAP aging has been established. As a result an increase of yield and ultimate tensile strength (YS and UTS) from 386 and 434 MPa to 434 and 470 MPa was obtained, respectively. Despite the increased strength the alloy elongation to failure remains high enough (~9%).
A possibility of the alloys additional processing by rolling has been investigated. After such a complex TMT it has been found out that the 1560 alloy strength in 2 mm processed sheets reached a record level (YS= 540 MPa and UTS=635 MPa) that was not observed in non-heat hardenable alloys earlier. For the 6061 alloy it is demonstrated that alloy YS and UTS make up to 475 and 500 MPa, whereas the elongation amounts to 7%.
Peculiarities of grain structure and texture evolutions as phase transformations due to TMT routes have been considered. The nature of the effects of ECAP and post-ECAP processing on the alloys mechanical behavior is discussed.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Maxim Y. Murashkin
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-03-31 10:40
Revised:   2005-03-31 10:51
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