Effect of microstructure on the corrosion behavior of a zinc?aluminium alloy

Choudhury, Priyanka; Das, Siddhartha

doi:10.1007/s10853-005-6329-2

Cited by 19 publications

(12 citation statements)

References 3 publications

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“…Subsequently, the hydroxide forms a protective layer on the surface of the metals and is expected to prevent or reduce further dissolution in the later stages. In the case of alloys, ZTiB1 and ZSr1, the mechanisms of corrosion and the corrosion product remain the same as in the other alloys [8].…”

Section: Introductionmentioning

confidence: 80%

Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

Krupiński

Krupińska

Labisz

et al. 2014

J Therm Anal Calorim

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In this study, the change of the cooling rate in the range of about 0.1-1°C s -1 and the addition of Sr on the crystallization kinetics of the cast zinc alloys of the ZnAlCu type, as well as its relation to the microstructure were also investigated. Therefore, the aim of the rapid crystallisation is the achievement of materials with better properties, which can be obtained by refinement of the dendritic or eutectic microstructure, elimination of segregation, or creation of metastable phases and their morphology changes. In the investigated alloys, the change of cooling rate of 1°C s -1 has caused microstructure's refinement as well as increase in hardness. Increase in the cooling rate causes also morphology changes of the g ? a eutectic, and makes generally a global overcooling of the alloy as well as change in the temperatures at the beginning of crystallization T DN and of the alloy crystallization T S . The presented investigations concerning the electron microscopy methods, including transmission electron microscopy, allow revealing the crystallographic structure, based on the d-spacing changes, as well as the diffraction method used for phase determination, which is a helpful tool for the explanation of the important points in the thermo-derivative analysis curve, where the relation between the amount of phase and the occurrence of new phases can be determined.

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Section: Introductionmentioning

confidence: 80%

Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

Krupiński

Krupińska

Labisz

et al. 2014

J Therm Anal Calorim

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“…Zn alloys with aluminium addition tend to cast shrinkage, which is possible to compensate by introducing alloying element as Sr, improving fluidity, castability and the tendency to hot cracking. By adding strontium there occurs refinement of the dendrite structure followed by heterogeneous nucleation on the Al 2 Sr phase [1][2][3][4]. In the work [5] there was confirmed that the mechanical properties of the ZnAl alloy primarily affect the distance between dendrites arms, instead of the grain size.…”

Section: Introductionmentioning

confidence: 85%

High Resolution TEM Investigations and TDA Analysis of Zinc Alloy with Strontium Addition

et al. 2016

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In this paper there are presented results of high resolution transmission electron microscope investigation concerning the structure of the Zn-Al-Si cast zinc alloy with Sr addition for crystal structure refinement after thermoderivative analysis performed using the universal metallurgical simulator and analyzer platform. The thermoderivative analysis allows to determine the specific points of the solidifying alloy, which is helpful for phase determination and proper heat treatment condition determination, allowing to reduce the energy costs and obtaining higher mechanical and functional properties. Using transmission electron microscopy, especially selected area diffraction method appliance it was possible to determine the phases occurring in the alloy in the state after chemical composition modification as well as after appliance of very precisely controlled cooling rate. The morphology and size of the microstructure of micro-sized eutectic was possible to determine as well the lattice parameters of the Zn α-phase. Particularly the overview will be also directed on the high resolution transmission electron microscope to achieve good insight into the structural changes on the atomic scale.

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“…bSi) eutectic or shifting of the characteristic equilibrium diagram temperature points, because of the pressure increase during the alloy crystallisation process. In this area, also the HPDL laser treatment with ceramic particle feeding is of big importance for changing the microstructure of aluminium [7][8][9][10][11][12][13][14]. The field of use of such HPDL-treated surface is repair of working elements produced from aluminium, where enhanced hardness and wear resistance is of great importance, for example valve seats or motor housing and pulley system parts.…”

Section: Introductionmentioning

confidence: 99%

Thermo-derivative analysis of Al–Si–Cu alloy used for surface treatment

Labisz

Konieczny

Jurczyk

et al. 2017

J Therm Anal Calorim

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The only effective way to design, produce, analyse and optimise new and existing industrial thermal processes and also laser-based processes is to develop a quantitative knowledge and understanding of the dependence between temperature and time, which allow the desired forming of properties of the final products. The purpose of this paper was the performance of thermoderivative analysis using the UMSA platform of aluminium alloy cooled at chosen rate, for obtaining characteristics used later for laser treatment and its influence on the microstructure and properties of the surface layer of heat-treated Al-Si-Cu cast aluminium alloys, using the high-power diode laser. The performed laser treatment involves remelting and feeding of ceramic powder into the aluminium surface. The carried out investigations allow to conclude that as a result of alloying of the heat-treated cast aluminium alloys with oxide ceramic powder, a surface layer was obtained with higher hardness compared to non-laser-treated material. The surface layer can be enriched with the powder particle, and in some cases a high-quality top layer is possible to obtain. Also a microstructure refinement of the surface layer was achieved due to the high laser power use and consequently high cooling rate during the crystallisation process. Concerning original practical implications of this work, there was important to investigate the appliance possibility of thermal analysis for further surface treatment for enhancement of the aluminium surface properties, especially the wear resistance and hardness. The scientific reason was also to describe microstructure changes and processes occurred in the laser remelted surface aluminium layer after laser treatment.

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Effect of microstructure on the corrosion behavior of a zinc?aluminium alloy

Cited by 19 publications

References 3 publications

Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

High Resolution TEM Investigations and TDA Analysis of Zinc Alloy with Strontium Addition

Thermo-derivative analysis of Al–Si–Cu alloy used for surface treatment

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