Influence of Microstructure on Electrochemical Properties of Severely Deformed Al-5 wt% Cu Alloy by ECAP

Zhang, Zuo Gui; Akiyama, Eiji; Watanabe, Yoshimi; Katada, Yasuyuki; Tsuzaki, Kaneaki

doi:10.4028/www.scientific.net/MSF.519-521.705

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HomeMaterials Science ForumAluminium Alloys 2006 - ICAA10Influence of Microstructure on Electrochemical...

Influence of Microstructure on Electrochemical Properties of Severely Deformed Al-5 wt% Cu Alloy by ECAP

Abstract:

The influence of microstructure on the electrochemical properties of an Al-5 wt% Cu binary alloy which was severely deformed by equal-channel angular pressing (ECAP) has been investigated in a borate-boric acid buffer solution containing Cl¯ ions at pH 8.3 and 25°C by potentiodynamic polarization test. The anodic polarization results showed that pitting potentials of ECAPed Al-Cu alloy samples were higher than that of the sample without ECAP and increased with repetitive ECAP passes. The pitting corrosion attack of Al-Cu alloy samples took place in the surroundings of Al2Cu (θ) phase. It is considered that the grain refinement of θ phase and the solid solution generated in Al matrix during ECAP process are responsible for the improvement of the corrosion resistance of ECAPed Al-Cu alloy.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Main Theme:

Aluminium Alloys 2006 - ICAA10

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

705-710

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.705

Citation:

Z. G. Zhang et al., "Influence of Microstructure on Electrochemical Properties of Severely Deformed Al-5 wt% Cu Alloy by ECAP", Materials Science Forum, Vols. 519-521, pp. 705-710, 2006

Online since:

July 2006

Authors:

Zuo Gui Zhang, Eiji Akiyama, Yoshimi Watanabe, Yasuyuki Katada, Kaneaki Tsuzaki

Keywords:

Al₂Cu Phases, Corrosion, Equal-Channel Angular Pressing (ECAP), Pitting

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Paper TitlePages

Improved Heat and Corrosion Resistance of Mg-Al-Zn Alloys by Additions of Minor Alloying Elements

Authors: Jeong Min Kim, Bong Koo Park, Joong Hwan Jun, Ki Tae Kim, Woon Jae Jung

Abstract: Small amounts of minor alloying elements such as RE and Sr were added to Mg- 8wt%Al-5wt%Zn (AZ91D+4%Zn), and their effects on the microstructure, mechanical properties and corrosion resistance were investigated. The microstucture of the investigated alloys could be characterized by dendritic Mg, Mg17Al12, a quasi-crystalline Zn-rich phase, and Al4RE (if RE is added). Although the tensile strength of alloys was not improved, the creep strength was significantly enhanced by the additions of minor alloying elements. No apparent influence of the additions could be found on the corrosion resistance.

374

Microstructure Evolution of AZ31 Magnesium Alloy during Warm Compression Forming

Authors: Zhi Min Zhang, Qiang Wang, B.C. Li, X. Zhang

Abstract: Warm compression tests of AZ31 Mg alloy were carried out at five temperatures in 30°C intervals from 210°C to 330°C. The samples of different thickness which were machined from as-cast and pre-strained AZ31 billets were compressed into thickness 1mm and then cooled in the air to room temperature. The microstructural evolution of AZ31 Mg alloy was investigated during warm compression forming. The results show that all the samples have undergone a microstructure changes to different scales in the range investigated. The twinning is the predominant deformation mechanism for magnesium alloys at moderate temperatures and its occurrence is dependent on temperature and strain. Microstructural evaluation indicates that the mean size of the recrystallised grains decreases with increasing effective strain and temperature because of sufficient dynamic recrystallization. The original grain has significant influence on microstructural evolution during warm forming.

1813

Rheocasting of Al-Cu Alloy A201 with Different Silver Contents

Authors: E.P. Masuku, Gonasagren Govender, L. Ivanchev, Heinrich Möller

Abstract: Rheocasting of alloys A206 and A201 was investigated in this study. Conical bars with different silver contents were produced using CSIR rheoprocess technology, together with high pressure die casting. The results showed that addition of Ag to alloy A206 increased the mechanical properties of the alloy. However, the addition of Ag also resulted in Cu-rich phases to precipitate at the grain boundaries of the as-cast material. The solution treatment used in this study was unable to dissolve all of this phase, especially in the 1.12%Ag-containing alloy. This resulted in slightly decreased mechanical properties compared to the 0.63%Ag-containing alloy. The T6 mechanical properties (strength and elongation) obtained in this study for rheocast A206 and A201 are better than those reported for permanent mould castings of alloy A206 and A201.

151

Effect of Heat Treatment on the Corrosion Resistance of Cast Mg-7.3Al Alloy

Authors: Su Qiu Jia, Guo Jun Liu, Qi Shuang Chen

Abstract: Mg-7.3Al magnesium alloys were investigated in the paper. The paper presents microstructural characterization of Mg-7.3Al alloy after casting and heat treatment. The casting temperature was 740°C and heat treatment was performed at 420 °C for 24 h with aging at 180 °C for 8h,16h,24h. The microstructure of the casting alloy consists of α-Mg phase matrix with a primary β phase (Mg17Al12) at grain boundaries. After solution treatment β phases were soluted in α-Mg phase matrix . Aging treatment caused β phases precipitation. The corrosion resistance of magnesium alloy was determined in 3.5 % NaCl by immersion tests and polarization curves. The results shows that the corrosion resistance of magnesium alloy after solution treat is the best than that of the others heat treatment in polarization curve tests and the samples with aging for 16h and 24h presents higher corrosion resistance than those with solution and aging for 8h in immersion tests. Solution treatment plays a main role for corrosion resistance of Mg-7.3Al magnesium alloy in short term corrosion, but more continuous β phases in Mg-7.3Al alloy after ageing act as a barrier and play a main role in long term corrosion.

585

The Influence of Aluminum on the Electrochemical Performance of Zinc Alloy Anode

Authors: Li Zhen Wang, Yan Juan Han, Kai Qing Zhang, Kun Wang

Abstract: The electrochemical behaviors of zinc electrode containing Bi, In and Al were tested to study aluminum acting on the electrochemical performance of zinc anode using anodic polarization and tafel profiles measurement. The element distributions of IBA alloy were observed by scanning electron microscope (SEM). Our recent investigations demonstrate that the electrochemical activity of zinc alloy could be improved largely through integrating the optimization content of aluminum into zinc alloy. The SEM images show that there are obvious differences in the element distributions of surface, subsurface or bulk phase, especially, the segregation of Al in subsurface or bulk. The electrochemical behaviors of IBA alloy are related to its physical properties.

590