Controlled diffusion solidification processing: A review

Pourgharibshahi, Mohammad; Divandari, M.; Larijani, Hassan Saghafian; Ashtari, Peyman

doi:10.1016/j.jmatprotec.2017.07.018

Cited by 21 publications

(3 citation statements)

References 50 publications

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“…The mixing step, nucleation, and growth are the steps of the mechanism of the CDS process presented by Apelian [12], Symeonidis [13], and Khalaf [6]. The results achieved from the successful CDS process are small size globular morphologies forming from copious nucleation occurring during the CDS steps without needing to add a grain re ner [6,8,11,14,15]. Khalaf [16,17] used Al-Cu and Al-Zn binary alloys system to study the microstructure formed by the CDS process experimentally and by simulation, the results exhibited that globular, rosette, and dendrites coexist in the entire microstructure, even though all the morphologies were exposed to the same thermal environment during growth, further, anomalous morphologies form in the microstructure when using pure aluminum as a rst precursor alloy that has a higher liquidus temperature.…”

Section: Introductionmentioning

confidence: 99%

Temperature, density, and velocity distribution in the mixture prepared by controlled diffusion solidification process

Khalaf

2022

Int J Adv Manuf Technol

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Controlled diffusion solidi cation (CDS) is a new casting process that depends on mixing two precursor alloys. The two precursor alloys have precisely controlled temperature and content to make a required resultant alloy. The CDS process can change the microstructure to non-dendritic happening from copious nucleation, resulting in minimizing the tendency toward the hot tearing. Contrary to the conventional casting in which the dendritic microstructure forms the entire microstructure of the product. In the present study, Pure aluminum and Al-33wt%Cu have been used to make Al-4.7wt%Cu by using the CDS technique, where the pure aluminum was mixed into Al-33wt%Cu through funnels that have 9 and 6mm diameter. The events such as the nucleation and heat transfer to the environment have been studied with aid of the temperature, density, and velocity distribution taking place during the mixing step of the CDS process. The results show that the thermal curves give better indications to predict the periods of nucleation and the heat transferring to the environment. Further, the copious nucleation that occurs in the CDS process can be improved by controlling the agitation during the mixing step by decreasing the velocity of the mixture near the crucible wall and increasing the velocity in the middle of the mixture. Ansys software was employed to simulate the temperature, density, and velocity distribution in the mixture during the mixing step. The experimental results were supported by simulation results and an optical microscopy test.

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Section: Introductionmentioning

confidence: 99%

Temperature, density, and velocity distribution in the mixture prepared by controlled diffusion solidification process

Khalaf

2022

Int J Adv Manuf Technol

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“…[17,18] Transforming the appearance of interstitial precipitates by solution treatment is a common way currently to reduce galvanic corrosion between the secondary phase and matrix. [19][20][21][22][23] Sr is a kind of trace element in the human body, which can cultivate bone tissue, accelerating the formation of bone. [24] Previous research has shown that Sr element in magnesium alloys enhances strength and refines grains.…”

Section: Introductionmentioning

confidence: 99%

“…Alloying and heat treatment are widely used for magnesium due to their simplicity of operation and low cost . Transforming the appearance of interstitial precipitates by solution treatment is a common way currently to reduce galvanic corrosion between the secondary phase and matrix …”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Corrosion Behavior and the Microstructure of Biomedical Mg–Y–Zn–Zr–Sr in Simulated Body Fluid Solution after Processing by Solution Treatment

Cao

Jia

et al. 2020

Adv Eng Mater

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Herein, as-cast Mg-2Y-Zn-0.4Zr-0.3Sr alloy's solution treatment at 500 C in the range of 10-35 h, and then cooled in 80 warm water, is used to investigate its dynamic corrosion behavior and surface morphology using a dynamic stimulating human environment device. Based on the result of corrosion behavior and microstructure, the alloy is mainly composed of α-Mg and W-phase (Mg 3 Zn 3 Y 2 ) in Mg-2Y-Zn-0.4Zr-0.3Sr alloy. With the increase in solution time, the corrosion resistance is prompted due to the uniform microstructure and second phase dissolved into the matrix. The corrosion resistance of Mg-2Y-Zn-0.4Zr-0.3Sr alloy is increased by enhancing solution time before 25 h due to the uniformly distributed second phases and microstructure, which can alleviate the galvanic corrosion. However, increasing solution time exceeding 25 h reduces the corrosion resistance of the alloy due to coarse grains. Furthermore, twinning, which appears in grains interior after solution treatment, has a positive influence on corrosion resistance. Therefore, the good corrosion resistance of solution-treated Mg-2Y-Zn-0.4Zr-0.3Sr alloy makes it excellent for biomaterial applications.

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Microstructure evolution of Al-Si hypoeutectic alloys prepared by controlled diffusion solidification

Khalaf

2022

Int J Adv Manuf Technol

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The possibility of changing the dendritic microstructure associated with the conventional casting processes of hypoeutectic Al-Si alloys to non-dendritic microstructure by using the controlled diffusion solidi cation process (CDS) has been investigated. The successful CDS process depends on mixing two precursor alloys heated at a superheat condition near their respective liquidus temperature. Experimental work and simulation work using Ansys software was carried out in the present study by employing Al-Si and Al-Cu systems. This study investigates the effect of the content of the two precursor alloys, the mass ratio changing from 2.6 to 8.3, and the superheat of the rst precursor alloy on changing the microstructure. The experimental results show that the pure aluminum used as the rst precursor alloy needs more undercooling and agitation during the mixing to form the non-dendritic microstructure compared with hypoeutectic Al-Si alloys. Further, mixing pure aluminum with hypereutectic alloy can change the microstructure of hypoeutectic alloys leading to extending the possibility to choose the second precursor alloy. The results also show that a higher mass ratio is preferred when mixing pure aluminum with hypoeutectic alloy. Furthermore, the microstructure of the alloy Al-6.45Si-4Cu-0.5Mg-0.66Fe-0.66 wt%Zn was successfully changed via the CDS process by mixing Al-7.75Si-0.79Fe-0.78Zn-0.6 wt%Mg at 2°C superheat into Al-24 wt%Cu at around 5°C superheat. The simulation results show that lower air bubbles and better distribution of the two precursor alloys happen during the mixing step when using the Al-Cu system.

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Controlled diffusion solidification processing: A review

Cited by 21 publications

References 50 publications

Temperature, density, and velocity distribution in the mixture prepared by controlled diffusion solidification process

Temperature, density, and velocity distribution in the mixture prepared by controlled diffusion solidification process

Research on Dynamic Corrosion Behavior and the Microstructure of Biomedical Mg–Y–Zn–Zr–Sr in Simulated Body Fluid Solution after Processing by Solution Treatment

Microstructure evolution of Al-Si hypoeutectic alloys prepared by controlled diffusion solidification

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