Solid fraction analysis with DSC in semi-solid metal processing

Birol, Yücel

doi:10.1016/j.jallcom.2009.06.165

Cited by 38 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, in their studies, disagreement of results yielded from different solid fraction measuring methods is inevitable. Birol [19] focused on differential scanning calorimetry (DSC) experiment. Results show that measured solid fraction is influenced greatly by the scan (heating and cooling) rate.…”

Section: Evaluation Of Solid Fractionmentioning

confidence: 99%

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

2012

View full text Add to dashboard Cite

Spheroidization of Al grains is required for the production of semi-solid slurry either by a partial solidification route or partial re-melting route. In this research, A356 aluminum alloy was deformed and partially re-melted to semi-solid state. A segregation sensitive reagent (Weck's reagent) was used to reveal the inner microstructure of Al grains for the better understanding of the microstructure evolution during partial re-melting. Optical microstructure observation showed that the previously compressed Al dendrites were actually ''fractured'' during heat treatment and such ''fractured'' dendrites contributed to the refinement and spheroidization of Al grains. Further study of this phenomenon indicates that the ''fractures'' are actually migrating high-angle grain boundaries, which was related to the recrystallization that occurred during heat treatment. Moreover, the growth layer of Al grains formed during water quenching is clearly visualized after being etched by Weck's reagent. Consequently, precise evaluation of solid fractions through image analysis was realized by excluding growth layer when measuring the area of solid phase.

show abstract

Section: Evaluation Of Solid Fractionmentioning

confidence: 99%

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

2012

View full text Add to dashboard Cite

show abstract

“…(7)(8)(9)(10). A much simpler way to evaluate the apparent heat capacity is by calculating dh/dT directly from Eq.…”

Section: Discussionmentioning

confidence: 99%

“…Beyond these variables, a relatively small number of authors have proposed analytical methods to evaluate, from DSC measurements, how the proportion of the different phases evolves with the temperature. Some of these methods were applied to the heat flux DSC [1][2][3][4][5] and others, to the powercompensated DSC [6][7][8]. Accurate determination of the evolution of the different phases with the temperature is challenging mainly because of the thermal resistance existing between the sample and the thermistor.…”

Section: Introductionmentioning

confidence: 99%

Mathematical analysis of the heat measured by a power-compensated differential scanning calorimeter during the solidification of a multiphase alloy

Larouche

Javidani

2015

J Therm Anal Calorim

View full text Add to dashboard Cite

The determination of the solidification characteristics of alloys using differential scanning calorimetry (DSC) is difficult because of the unknowns associated with the kinetic of phase transformations and the thermal resistance between the sample and the temperature measuring device. This paper shows how appropriate assumptions coupled with a thermodynamic software package and an accurate mathematical analysis of a power-compensated DSC, can enable a direct comparison between the experimental and the theoretical heat evolutions obtained during the solidification of a multiphase alloy. This comparison is helpful in order to assess the thermodynamic database and to validate the different assumptions made in the solidification model.

show abstract

“…The solid fraction (fs) of 7050 alloy as a function of temperature was calculated using the method [15] based on DSC results and is shown in Figure 1. The semisolid forming of metallic alloys majorly takes place at solid fractions between 0.4-0.6 [10].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Rheological Properties of Semi-Solid 7075 Slurries Using SEED Rheocasting Process

Bolouri

Zhao

Côté

et al. 2016

SSP

View full text Add to dashboard Cite

The SEED rheocasting process was used to produce semisolid slurries of high strength 7075 aluminum wrought alloys. The effects of the SEED processing parameters on the microstructure of semisolid slurries were studied. The impact of grain refinement on the grain morphology and size was investigated. The rheological properties of semisolid 7075 alloys were characterized at different solid fractions using a parallel plate compression viscometer. Results indicated that the grain refinement could greatly improve the globularity of α-Al grains and rheoformability. The relationships between viscosity and shear rate at different solid fractions in the transient state for both unrefined and refined semisolid slurries were evaluated and discussed.

show abstract

Solid fraction analysis with DSC in semi-solid metal processing

Cited by 38 publications

References 28 publications

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

Mathematical analysis of the heat measured by a power-compensated differential scanning calorimeter during the solidification of a multiphase alloy

Microstructure and Rheological Properties of Semi-Solid 7075 Slurries Using SEED Rheocasting Process

Contact Info

Product

Resources

About