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Research Papers

Effect of Severe Plastic Deformation by 120 deg ECAP or Shock Impact on 6061 Aluminum Alloy at High Strain Rates

[+] Author and Article Information
T. Camalet

ICube UMR 7357—Laboratoire des
sciences de l'ingénieur,
de l'informatique et de l'imagerie,
300 bd Sébastien Brant—CS 10413,
Illkirch Cedex F-67412, France
e-mail: tristan.camalet@etu.unistra.fr

A. Rusinek, R. Bernier

Laboratory of Microstructure Studies and
Mechanics of Materials (LEM3),
University of Lorraine,
UMR-CNRS 7239,
7 rue Félix Savart,
Metz 57073, France

M. Karon, M. Adamiak

Institute of Engineering Materials
and Biomaterials,
Silesian University of Technology,
ul Konarskiego 18A,
Gliwice 44-100, Poland

R. Massion

Laboratory of Microstructure Studies and
Mechanics of Materials (LEM3),
University of Lorraine,
UMR-CNRS 7239,
7 rue Félix Savart,
Metz 57073, France;
DAMAS, Lab Excellence Design Alloy Met Low
Mass Struct,
University of Lorraine,
Metz F-57045, France

G. Z. Voyiadjis

Computational Solid Mechanics Laboratory,
Department of Civil and Environmental
Engineering,
Louisiana State University,
Baton Rouge, LA 70803
e-mail: voyiadjis@eng.lsu.edu

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 22, 2017; final manuscript received January 22, 2018; published online April 13, 2018. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 140(4), 041001 (Apr 13, 2018) (9 pages) Paper No: MATS-17-1278; doi: 10.1115/1.4039690 History: Received September 22, 2017; Revised January 22, 2018

The aim of this paper is to analyze the macroscopic behavior of an aluminum alloy after severe plastic deformations (SPD). Samples of 6061 aluminum alloy are processed at room temperature by two techniques of SPD: equal channel angular pressing (ECAP) under quasi-static loading and impact under dynamic loading, using Taylor's test setup. In addition to the mechanical properties, the microstructure evolution of the material is investigated. Half of the samples are aged at 400 °C for 2 h, to remove internal stress in a commercial alloy in order to increase workability of the material. The evolution of the properties and the material behavior after 2, 4, 6, and 8 passes of the 120 deg ECAP process is investigated.

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References

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Figures

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Fig. 1

(a) Hydraulic device use for ECAP specimen preparation and (b) sketch of the matrix used to deform the specimens [10]

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Fig. 2

Sample extrusion: (a) route 1 and (b) route 2

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Fig. 3

Taylor's test description used to induce an initial plastic deformation

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Fig. 4

Process used for dynamic characterization after Taylor test

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Fig. 5

Microhardness distribution along the Taylor's test specimens for as received and annealed microstructure

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Fig. 6

Schematic description of SHPB

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Fig. 7

Initial microstructure A0. Light microscopy, magnification 100×- bright field (a) radial direction (εN=0) and (b) longitudinal direction (εN=0).

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Fig. 8

Light microscopy, magnification 200×- bright field. Heat treated aluminum alloy: (a) after 2 ECAP passes using routes 1 and (b) after 8 ECAP passes using route 1, both longitudinal direction.

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Fig. 9

Behavior of Al 6061 under dynamic compression for different number of passes and material state

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Fig. 10

Compression tests of annealed ECAP samples for two strain rates: (a) 1600 s−1 and (b) 2700 s−1

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Fig. 11

Compression tests at high strain rate, stress versus cumulative strain: (a) annealed ECAP sample and (b) as received ECAP samples

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Fig. 12

Compression tests, stress versus cumulative strain of annealed ECAP samples for different strain rates

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Fig. 13

Compression tests, stress versus strain of (a) as received and (b) annealed predeformed samples

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Fig. 14

Light microscopy, magnification 200×- Nomarski interference contrast. Aluminum alloy after Taylor test T1–9 bar, 137,7 m/s: (a) front and (b) end of specimen.

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