Evaluation of the effect of grain refiners on the solidification characteristics of an Sr-modified ADC12 die-casting alloy by cooling curve thermal analysis

Farahany, Saeed; Idris, Mohd Hasbullah; Ourdjini, Ali; Faris, Fadi; Ghandvar, Hamidreza

doi:10.1007/s10973-014-4367-1

Cited by 27 publications

(9 citation statements)

References 24 publications

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“…It could be also seen that increasing cooling rate for EN AC 51100 alloy does not provide significant changes in nucleation temperature. The increasing nucleation temperature allows new crystals to form ahead of solidification, which means there are more nuclei with less potential for growth, and thus effective grain refinement should be expected [14]. The next characteristic points on the crystallisation curves were observed at 638.0 and 625.2°C, respectively.…”

Section: Investigated Alloysmentioning

confidence: 99%

“…Once the dendrites become coherent, liquid metal flow is restricted to interdendritic regions. There exist four main DCP temperature testing approaches: the rheological technique (however, this method may influence DCP measurement), thermal analysis of the minimum temperature differences between two cooling curves, thermal analysis of the second derivative of cooling curve and the thermal diffusivity measurements techniques [12,14].…”

Section: Introductionmentioning

confidence: 99%

“…In agreement with this understanding, the grain size in solidifying microstructure has been decided and will not change at/after this point. Correspondingly, the solid fraction (f) at DCP has been defined as f DCP , and a higher f DCP means finer grain size after solidification of alloy [14].…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of aluminium–magnesium casting alloys after heat treatment

Król

Tański

Snopiński

et al. 2016

J Therm Anal Calorim

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Since the forming of the microstructure depends on the specific of the casting method, which directly affects further mechanical and physical properties of the material, it is important to understand how to control the microstructure of the cast to understand changes that taking place during the crystallisation process. For estimating the metallurgical quality of the liquid metal before casting, the thermal-derivative analysis (TDA) is utilised. The TDA has been used for a long time, in both ferrous and non-ferrous industries casting. The Universal Metallurgical Simulator and Analyser (UMSA) platform is a rapid, sensitive and economical method of determining a full range of solidification features. The work focuses on the thermal analysis and heat treatment of aluminium alloys. The liquidus and solidus temperatures and dendrite coherency point (DCP) are then characterised. The research shows that the UMSA platform allows precise determination and calculation of thermal parameters. The influence of the heat treatment on structure and properties of aluminium castings has been determined as well. Heat treatment was carried out to increase the mechanical properties of aluminium alloys.Based on the findings above, the influence of microstructure on properties of the alloys is discussed.

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Section: Investigated Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and properties of aluminium–magnesium casting alloys after heat treatment

Król

Tański

Snopiński

et al. 2016

J Therm Anal Calorim

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“…Correspondingly, the modifying agent was added that aims that improve the mechanical properties by altering the structure of the eutectic silicon. sharp-rough Al-Si eutectic phase turn into fibrous and enhanced tensile strength of its alloy [13]. Fabrication of nano-size AMCs was performed by stir casting method, which relatively simple and low-cost process.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and tribological properties of nano-sized Al2O3 particles on ADC12 alloy composites with Strontium modifier produced by stir casting method

Akira

Haritsah

Zulfia

et al. 2021

ADI Journal on Recent Innovation (AJRI)

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Nano-Al2O3 particles were incorporated into ADC12 alloy with the addition of Al-5Ti-B, Al-Sr, and Mg to achieve high performance in mechanical and tribological properties. In this study, varied nano-Al2O3 was used from 0.25 vf-% to 0.5 vf-% through stir casting methods to discover the optimum amount to obtain high performance. Besides, the inclusion of grain refiner Al-5Ti-B and microstructure modifier Al-Sr is expected to improve performance to the next level. However, porosity and agglomeration still be a concern in Aluminum alloy matrix composite fabrication. The presence of spinel phase MgAl2O4 in the interface area between nano-Al2O3 particles and ADC12 alloy is relied upon to minimize this porosity and agglomeration issue. The optimum of tensile strength and hardness was found at 0.35 vf-% Al2O3 and wear rate at 0.4 vf%. Although, the optimum point of wear found at 0.4 vf%, porosity began to increase at 0.4 vf% as well. As a result, 0.35 vf% addition of the nano-Al2O3 gives the best performance for the composite.

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“…Special attention was payed to studying of the surface layer morphology of the investigated material especially the surface layer microstructure [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] if the used ceramic particle powder was properly introduced into the matrix, how the phases were changed in terms of distribution and size as well as if a zone-like structure was obtained after appliance of the laser surface treatment.…”

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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Evaluation of the effect of grain refiners on the solidification characteristics of an Sr-modified ADC12 die-casting alloy by cooling curve thermal analysis

Cited by 27 publications

References 24 publications

Structure and properties of aluminium–magnesium casting alloys after heat treatment

Structure and properties of aluminium–magnesium casting alloys after heat treatment

Mechanical and tribological properties of nano-sized Al2O3 particles on ADC12 alloy composites with Strontium modifier produced by stir casting method

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

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