The effect of cooling rate on thermophysical properties of magnesium alloys

Khan, M. N.; Aljarrah, M.; Wood, Jeffrey; Medraj, Mamoun

doi:10.1557/jmr.2011.24

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…These wide solidification ranges can be explained by the presence of low melting eutectic phases. 52 The onset of the melting of the LPSO structures (540 • C, Figure 5) agrees very well with the ZST. This result confirms that the loss of the strength is caused by the significant melting of the LPSO phases.…”

Section: Btr Of the Mg 97 Y 2 Zn 1 Alloysupporting

confidence: 69%

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Hot crack susceptibility of cast Mg₉₇Y₂Zn₁

Krbetschek

Trân

Wemme

et al. 2021

Engineering Reports

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Formation of hot cracks in alloys is a critical issue for their production and processing. In this study, the susceptibility of the cast Mg97Y2Zn1 alloy containing long period stacking ordered (LPSO) structures to hot cracking was investigated using tensile tests in a Gleeble testing machine, and described in terms of the brittle temperature range (BTR), which was concluded from the zero strength temperature (ZST), zero ductility temperature, and ductility recovery temperature (DRT). The zero ductility and the DRTs were obtained directly from the mechanical tests, verified using fracture surface analysis in a scanning electron microscope, and correlated with the solidification range that was determined using differential scanning calorimetry. The extent of the BTR was 31 K, the width of the solidification range 100 K. The ZST coincided with the dissolution temperature of the LPSO structures, which means that the hot cracking susceptibility of the cast Mg97Y2Zn1 alloy is dominated by the dissolution of LPSO structures.

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Section: Btr Of the Mg 97 Y 2 Zn 1 Alloysupporting

confidence: 69%

“…The solidification ranges of the AZ91 and AM60B alloys are 172 K and 191 K, respectively. These wide solidification ranges can be explained by the presence of low melting eutectic phases 52 …”

Section: Resultsmentioning

confidence: 99%

Hot crack susceptibility of cast Mg₉₇Y₂Zn₁

Krbetschek

Trân

Wemme

et al. 2021

Engineering Reports

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“…Phases were formed at higher temperatures when samples were cooled faster −100 °C/min, as compared to the slower cooling rate −50 °C/min. Although Khan [ 27 ] observed a similar trend on different Mg-alloys, this result is unexpected. Usually, higher cooling rates correspond to higher undercooling.…”

Section: Discussionmentioning

confidence: 80%

Phase Formation during Solidification of Mg-Nd-Zn Alloys: An In Situ Synchrotron Radiation Diffraction Study

et al. 2018

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Mg-4Nd base alloys with Zn additions of 3, 5 and 8 wt % were investigated with in situ synchrotron radiation diffraction during solidification. This method enabled the investigation of phase formation and transformation in the alloys. The diffraction results were supported with TEM observations on the as-solidified samples. The results show the effect of increased Zn addition on stabilizing the Mg3RE phase (RE—rare earth). The experimental results agree only partially with the theoretical calculations indicating the need to improve the existing thermodynamic database on the alloy system.

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“…Very few experimental works [7][8][9][10] regarding the microsegregation analysis of magnesium alloys were found in the literature. In contrary, several studies [11][12][13][14][15][16][17][18][19][20] were carried out to investigate the solidification behavior of magnesiumbased alloys. Although the prime focus of these studies was not on microsegregation analysis, valuable information regarding elemental composition at different cooling rates and conditions could be obtained from them.…”

Section: Literature Datamentioning

confidence: 99%

Influence of Cooling Rate on Microsegregation Behavior of Magnesium Alloys

Khan

Mostafa

Aljarrah

et al. 2014

Journal of Materials

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The effect of cooling rate on microstructure and microsegregation of three commercially important magnesium alloys was investigated using Wedge (V-shaped) castings of AZ91D, AM60B, and AE44 alloys. Thermocouples were distributed to measure the cooling rate at six different locations of the wedge casts. Solute redistribution profiles were drawn based on the chemical composition analysis obtained by EDS/WDS analysis. Microstructural and morphological features such as dendrite arm spacing and secondary phase particle size were analyzed using both optical and scanning electron microscopes. Dendritic arm spacing and secondary phase particle size showed an increasing trend with decreasing cooling rate for the three alloys. Area percentage of secondary phase particles decreased with decreasing cooling rate for AE44 alloy. The trend was different for AZ91D and AM60B alloys, for both alloys, area percentage of β-Mg17Al12 increased with decreasing cooling rate up to location 4 and then decreased slightly. The tendency for microsegregation was more severe at slower cooling rates, possibly due to prolonged back diffusion. At slower cooling rate, the minimum concentration of aluminum at the dendritic core was lower compared to faster cooled locations. The segregation deviation parameter and the partition coefficient were calculated from the experimentally obtained data.

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The effect of cooling rate on thermophysical properties of magnesium alloys

Abstract: Abstract

Cited by 15 publications

References 16 publications

Hot crack susceptibility of cast Mg₉₇Y₂Zn₁

Hot crack susceptibility of cast Mg₉₇Y₂Zn₁

Phase Formation during Solidification of Mg-Nd-Zn Alloys: An In Situ Synchrotron Radiation Diffraction Study

Influence of Cooling Rate on Microsegregation Behavior of Magnesium Alloys

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The effect of cooling rate on thermophysical properties of magnesium alloys

Abstract: Abstract

Cited by 15 publications

References 16 publications

Hot crack susceptibility of cast Mg97Y2Zn1

Hot crack susceptibility of cast Mg97Y2Zn1

Phase Formation during Solidification of Mg-Nd-Zn Alloys: An In Situ Synchrotron Radiation Diffraction Study

Influence of Cooling Rate on Microsegregation Behavior of Magnesium Alloys

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Hot crack susceptibility of cast Mg₉₇Y₂Zn₁

Hot crack susceptibility of cast Mg₉₇Y₂Zn₁