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  1. 2 Acta Physica Polonica A

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  1. 2 2017

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  1. 2 Asan A.

  2. 2 Erek H.

  3. 2 Özyürek D.

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Electrical Conductivity and Corrosion Performances of In Situ and Ex Situ AA7075 Aluminum Composites

100%
Erek H., Özyürek D., Asan A.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
153-155
EN
The present study investigates corrosion behaviors and electric conductivity of AA7075 in situ (TiAl₃) and ex situ (B₄C) composites produced by powder metallurgy method. In production of in situ composites, various amounts of Ti (2, 4 and 6%) are added to AA7075 and for production of ex situ composites, B₄C (3, 6, and 9%) are added. Prepared in situ and ex situ composite powders were pre-shaped at 600 MPa pressure with cold pressing. Pre-shaped samples were sintered in the atmosphere-controlled furnace at 580°C for 4 h. Corrosion test of produced composites was conducted in 0.1 M H₂SO₄ solution. As a result of these analyses, corrosion examinations on in situ manufactured composites revealed that anode and cathode currents are close to each other and those composites do not exhibit different corrosion behaviors. Corrosion rate of B₄C added ex situ composites increases by B₄C rate (due to increase of density of current).
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Corrosion Behaviour and Electrical Conductivity of Reinforced TiAl₃ and B₄C Hybrid Aluminium Composites

100%
Erek H., Özyürek D., Asan A.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
156-158
EN
In this study, corrosion and electric conductivity of aluminum hybrid composites (in situ TiAl₃ and ex situ B₄C) produced by powder metallurgy are investigated. Hybrid (in situ and ex situ) aluminum composite powders are produced by adding different amounts of titanium and B₄C into AA7075 alloy powders. After the hybrid composite powders are cold pressed (600 MPa), they are sintered in atmosphere controlled furnace at 580°C for 4 h. As a result of this study, it was observed that increase of B₄C%(Ti constant) decreases density and increase of Ti%(B₄C constant) increases the density of composites. It was determined that corrosion resistances (R_{p}) of hybrid composites decreased due to interface surfaces formed between the reinforcement phase and the matrix.
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