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1

Study of the microstructure and stress corrosion cracking (SCC) resistance of marine grade aluminium matrix composite

Kuburi L. S., Dauda M., Yaro S. A., Abdulwahab M.

Mechanics and Mechanical Engineering

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2017

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Vol. 21, nr 4

833--841

EN

The aim of this research was to develop marine grade aluminium (Al-3%Mg) matrix composite resistant to stress corrosion cracking (SCC). Silicon carbide particulate (SiCp) was used as reinforcement at 5% interval from 0- 25%. Sodium chloride (3.5% NaCl) was used as marine environment. The materials were developed through stir casting process. Slow stain rate testing (SSRT) machine was used for the study of the SCC in 3.5% NaCl. The XRF analysis conducted on the materials proved that the elements were within the scope. Microstructural analysis of the materials showed a clear evidence of dendritic formation of the alloy matrix coupled with the SiCp reinforcement. SCC test showed that control sample A failed at a lower energy of 12.3KN with an extension of 0.7472 mm while Sample F recorded the highest value of energy up to 20 KN with an extension of 1.829 mm. The developed composite materials were found to be more reliable for use in marine environment than the existing marine grade alloy presently in use in most of the facilities in marine environment. It was learned that with little improvement on the existing marine grade Al alloy a lot of life and resources will be saved.

2

Structure, mechanical properties and corrosion resistance of AlMg5 and AlMg1Si1 alloys

Kciuk M., Tkaczyk S.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 21, nr 1

39-42

EN

Purpose: The main task of this work was to define the optimum heat treatment parameters so as to received the alloys resistant for stress corrosion cracking, within the limits of the corrosion factor, i.e. artificial sea water. Design/methodology/approach: The mechanical properties were evaluated by tensile tests. The corrosion tests (in corrosion environment and inert-glycerol) were carried out on the device, making possibility extension of the samples with constant speed until break. Another investigations: SEM, light microscopy and TEM. Findings: The researches included structural analyse, mechanical and corrosion investigations, which allow to define the optimum parameters (quenching at 560 degrees centigrade temperature, in water, artificial ageing at temperature 160 degrees centigrade/12 h) so as to received the alloys resistant for stress corrosion cracking. Research/limitations/implications: Conducted investigations layout the areas of later researches, a specially in the direction of the possible, next optimization tests of their structure, e.g. in the range of raising resistance on corrosion cracking in chosen media. Practical implications: The range of possible uses the regard also increases from this, as materials on working constructions in the investigated aggressive environment. Originality/value: Contributes to research on corrosion protection for aluminium and its alloys.

3

The structure, mechanical properties and corrosion resistance of aluminium AlMg1Si1 alloy

Kciuk M.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 16, nr 1-2

51--56

EN

Purpose: The aim of this investigation was to define optimum heat treatment parameters so as to received the alloy resistant for stress corrosion cracking, within the limits of the corrosion factor i.e. artificial sea water (3 % NaCl solution). Design/methodology/approach: The corrosion tests (in corrosion environment and inert-glycerol) were carried out on the device, making possibility extension of the samples with constant speed until break. Another investigations: SEM, tensile and Vickers hardness tests, X-ray Phase Analysis, light microscopy and TEM. Findings: The researches included structural analyze, mechanical and corrosion investigations, which allow to define the optimum parameters (quenching at 560ºC temperature, in water, artificial ageing at temperature160ºC/12h) so as to received the alloy resistant for stress corrosion cracking. Research limitations/implications: Contributes to research on corrosion protection for aluminium and its alloys. Practical implications: Conducted investigations lay out the areas of later researches, especially in the direction of the possible, next optimization tests of their structure, e.g. in the range of raising resistance on corrosion cracking in chosen media. Originality/value: The range of possible uses the regard also increases from this, as materials on working constructions in the investigated aggressive environment.

4

Susceptibility to stress corrosion cracking in 3.5% NaCl of the welded joints of some Al alloys.

Chrzanowski J., Czechowski M., Zieliński A.

Inżynieria Materiałowa

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2001

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R. XXII, nr 4

255-258

EN

The specimens of welded AlZn5Mg1, AlMg4,5Mn and ALUSTAR Al-Mg alloys were tensed at slow strain rate in air and 3,5% NaCl solution. The time-to-failure, reduction-in-area, elongation, tensile strength, and fracture energy were measured. The microstructures and fracture modes were examined with the scanning electron microscope.

PL

Badano złącza spawane stopów AlZn5Mg1, AlMg4,5Mn oraz stopu AlMg ALUSTAR poddane rozciąganiu z małą szybkością w powietrzu i 3,5% roztworze NaCl. Mierzono czas do zniszczenia, przewężenie, wydłużenie, wytrzymałość na rozciąganie i energię zniszczenia. Badano mikrostrukturę i przełomy mikroskopem elektronowym skaningowym.

5

Effect of the retrogression and reageing heat treatment on mechanical properties, dislocation structure, susceptibility to stress corrosion cracking and fracture mode of the AlZn5Mg1 alloy.

Chrzanowski J., Gazda A., Warmuzek M., Jezierska E., Zieliński A.

Inżynieria Materiałowa

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2001

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R. XXII, nr 4

253-254

EN

The time-to-failure, RRA and fracture energy was measured in Slow Strain Rate Test in air and seawater, and dislocation structure and fracture mode examined with the transmission and scanning electron microscopes for the AlZn5Mg1 alloy. The observed change in the alloy behaviour was attributed to change in its microstructure.

PL

Czas do zniszczenia, przewężenie i energia zniszczenia stopu AlZn5Mg1 mierzone były w trakcie powolnego rozciągania w wodzie morskiej i powietrzu, a struktura dyslokacyjna i przełomy analizowane metodami mikroskopii elektronowej. Obserwowane zmiany zachowania się stopu przypisano zmianom jego mikrostruktury.

6

Hydrogen effects on stress corrosion cracking of some aluminium alloys.

Zieliński A.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

433-438

EN

Results of slow strain rate testing of the Al-Zn-Mg and Al-Zn-Cu-Mg aluminium alloys in NaCl solutions are presented. The evidence of hydrogen contribution to stress corrosion cracking is demonstrated by the effects of addition of arsenic trioxide, post exposure storage and cathodic polarisation on susceptibility to stress corrosion cracking. The mechanism of hydrogen-assisted stress corrosion cracking that includes the concept of critical hydrogen concentration dependent on grain boundary microstructure is discussed.