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Microstructural Evolution and Mechanical Response of Equal-Channel Angular Extrusion-Processed Al-40Zn-2Cu Alloy

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Abstract

Microstructural evolution, tensile properties, and impact toughness of an aluminum-zinc-copper (Al-40Zn-2Cu) alloy subjected to repetitive equal-channel angular extrusion (ECAE) up to four passes following either route A or route BC were investigated. The experimental results reveal that the ECAE eliminated as-cast dendritic microstructure along with casting defects such as microporosities almost completely. The ECAE-processed samples consisted of mostly elongated microconstituents via route A and equiaxed microconstituents via route BC. The high stresses imposed in ECAE lead to the fragmentation of the copper-rich θ phase into smaller particles with significant fragmentation occurring in the first pass and additional breaking in the subsequent passes in both routes. The ECAE processing simultaneously increased both the strength and ductility of the alloy as compared to the as-cast state, regardless of the processing route and number of passes. The deformation behavior of as-cast Al-40Zn-2Cu alloy has changed from brittle to ductile mode after ECAE due to the microstructural refinement, deformation-induced homogenization, and reduction of porosities. The limited impact toughness of as-cast alloy was significantly improved by multipass ECAE, especially in route A.

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Acknowledgments

This research was supported by The Scientific and Technological Research Council of Turkey (TUBITAK), Engineering Research Group (MAG), under Grant No. 104M289, and by the Scientific Research Projects of Karadeniz Technical University, under Grant No. 2005.112.003.5. Two of the authors (IK and MH) acknowledge the support from the United States National Science Foundation, Contract No. CMMI 01-34554, Materials Design and Surface Engineering Program, and the Office of Naval Research, under Grant No. N00014-05-1-0615, with Dr. Lawrence Kabacoff as program officer. The authors thank Dr. T. Kucukomeroglu for his help during completion of the experiments.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    G. Purcek (Associate Professor) & O. Saray (Ph.D. Student)

  2. Department of Mechanical Engineering, Texas A&M University, College Station, TX, 77843, USA

    I. Karaman (Associate Professor) & M. Haouaoui (Doctor)

Authors
  1. G. Purcek
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  2. O. Saray
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  3. I. Karaman
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  4. M. Haouaoui
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Correspondence to G. Purcek.

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Manuscript submitted October 26, 2008.

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Purcek, G., Saray, O., Karaman, I. et al. Microstructural Evolution and Mechanical Response of Equal-Channel Angular Extrusion-Processed Al-40Zn-2Cu Alloy. Metall Mater Trans A 40, 2772–2783 (2009). https://doi.org/10.1007/s11661-009-9940-z

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  • DOI: https://doi.org/10.1007/s11661-009-9940-z

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