Effect of cooling rate and Al content on solidification characteristics of AZ magnesium alloys using cooling curve thermal analysis

Yavari, F.; Shabestari, S.G.

doi:10.1007/s10973-017-6240-5

Cited by 36 publications

(9 citation statements)

References 19 publications

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“…However, the amount of aluminum in solid solution of primary or eutectic α-Mg was not influenced by cooling rate. Increasing the cooling rate showed no effect on the morphology of the eutectic in a study by Yavari and Shabestari [23], forming a partially divorced structure in all cases, though this study did not quantify the degree to which the eutectic was divorced, as in the aforementioned study. In this work however, the amount of eutectic phase present in the microstructure was increased with an increase in cooling rate [23].…”

Section: Effect Of Solidification Rate On Az Alloy Microstructure and Propertiesmentioning

confidence: 63%

“…Increasing the cooling rate showed no effect on the morphology of the eutectic in a study by Yavari and Shabestari [23], forming a partially divorced structure in all cases, though this study did not quantify the degree to which the eutectic was divorced, as in the aforementioned study. In this work however, the amount of eutectic phase present in the microstructure was increased with an increase in cooling rate [23]. This is explained by an enrichment of the aluminum within the liquid ahead of the solid-liquid interface during higher cooling rates, causing this material to reach the eutectic composition.…”

Section: Effect Of Solidification Rate On Az Alloy Microstructure and Propertiesmentioning

confidence: 63%

“…These effects are shown in Figure 2.4 by Cao and Wessén, where the higher drawing rate (during direct-chill casting) corresponds to a more refined grain size. The aluminum content has an indirect effect on the strength of the alloy as well, as it has also been found that alloys with a higher aluminum content result in a finer SDAS or grain size [10,23]. It is clear that increasing the aluminum content has a direct correlation with the alloy strength, however at a certain point (past approximately 8% by weight), the alloy becomes too brittle, and the poor ductility causes a decrease in strength [10].…”

Section: Effect Of Aluminum Content On Az Alloy Microstructure and Propertiesmentioning

confidence: 98%

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Influence of As-cast Microstructure on Forging Behaviour of Magnesium Alloy AZ80

Uramowski¹

2021

Preprint

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Section: Effect Of Solidification Rate On Az Alloy Microstructure and Propertiesmentioning

confidence: 63%

Section: Effect Of Solidification Rate On Az Alloy Microstructure and Propertiesmentioning

confidence: 63%

Section: Effect Of Aluminum Content On Az Alloy Microstructure and Propertiesmentioning

confidence: 98%

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Influence of As-cast Microstructure on Forging Behaviour of Magnesium Alloy AZ80

Uramowski¹

2021

Preprint

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“…However, it is much more complicated than the Newtonian method. Besides, a thermal contraction of the metal occurs during solidification, the exact positions of the two-thermocouple tips are difficult to estimate [16][17][18]. The base line has been predicted by the sixth polynomial fitting (dT/dt) BL = a 0 ?a 1 T?a 2t) BL = a 0 ?a 1 T?a 2 T 2 ?a 3 T 3 ?a 4 T 4 ?a 5 T 5 ?a 6 T 6 between the beginning and the end of solidification in the first derivative curve.…”

Section: Methodsmentioning

confidence: 99%

Effect of grain refinements on the microstructure and thermal behaviour of Mg–Li–Al alloy

Król

2018

J Therm Anal Calorim

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The light as-cast Mg-9Li-1.5Al alloys were manufactured and modified by 0.2 mass% Zr, commercial 0.2 mass% TiBor and 0.2 mass% AlSr master alloys. The thermal derivative analysis using UMSA platform was utilised to characterise a crystallisation process. Samples were heated up to 700°C and then freely cooled down (* 0.6°C s-1) to ambient temperature in order to simulate the natural cooling of casts. Dilatometry study was used to identify changes in solid state. The relative elongation of unmodified and modified alloys was measured in the temperature range from 20 to 400°C, with a heating rate 1.0°C s-1. The effects of Zr, TiBor and AlSr content on the microstructure of analysed magnesium alloys were investigated. Evaluation of microstructure was identified by light microscope, scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. The results showed that the addition of TiBor reduced the grain size of Mg-9Li-1.5Al cast alloy from 930 to 530 lm, while the addition of AlSr master alloy reduced the grain size to 480 lm. Moreover, an addition of TiBor and AlSr simultaneously reduced the grain size to 430 lm. The addition of Zr causes a reduction in grain size to 630 lm. The addition of grain refinement causes changes in crystallisation process and variations in the coefficient of linear thermal expansion (CTE).

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“…To magnesium alloys, grain refinement is essential as an excellent grain size generally leads to developed mechanical features and a more uniform concentration of secondary phases and solute elements on a fine scale which results in greater machinability [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Magnesium–lithium alloys with TiB and Sr additions

Król

2019

J Therm Anal Calorim

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The ultralight hypoeutectic a-phase Mg-4.5Li-1.5Al alloy and hypereutectic b-phase Mg-12Li-1.5Al alloy in as-cast state were fabricated and subjected to modification by 0.2 mass% TiB and 0.2 mass% Sr grain modifiers. The crystallisation sequence of Mg-Li-Al alloys has been investigated in detail by using thermal-derivative analysis and microstructural observations. The presented work includes the effects of grain refiners on grain size and microstructure and thermal events registered during crystallisation of ultralight Mg-Li-Al alloys by recording and analysis of the temperature vs time, i.e. as T N , T a , T b , T g(LiAl) and T SOL. Microstructure and phase observation has been done by light microscope, X-ray diffraction and energy dispersive X-ray spectroscopy. The changes of characteristic temperature points for phase transformation are studied in detail. Due to the addition of 0.2 mass% TiB and 0.2 mass% Sr, the grain structure of the alloy was refined, and mechanical properties were improved. When a TiB and Sr added simultaneously, the average grain size of the analysed alloys strongly decreases. When the TiB or Sr content was severally added, a low effect of improvements of mechanical properties was observed. With the TiB and Sr content, the liquidus and solidus decrease gradually.

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Effect of cooling rate and Al content on solidification characteristics of AZ magnesium alloys using cooling curve thermal analysis

Cited by 36 publications

References 19 publications

Influence of As-cast Microstructure on Forging Behaviour of Magnesium Alloy AZ80

Influence of As-cast Microstructure on Forging Behaviour of Magnesium Alloy AZ80

Effect of grain refinements on the microstructure and thermal behaviour of Mg–Li–Al alloy

Magnesium–lithium alloys with TiB and Sr additions

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