Journal of Materials Science

, Volume 29, Issue 9, pp 2491–2499 | Cite as

Microstructural evolution and calorimetric evaluation of non-equilibrium states in rapidly solidified Al-Mn-Co ternary alloys

  • Yibin Zhang
  • Toshimi Yamane
  • Shigeoki Saji
  • Junzo Takahashi


Evolutionary structures were observed in as-melt spun ribbons of Al-3.5Mn-0.8Co, Al-3.5Mn-1.3Co, Al-3.5Mn-2Co, Al-5Mn-0.8Co and Al-5Mn-2Co alloys. The evolutionary structures contained two zones, zone A and zone B, at the chilled and unchilled sides, respectively. A banded structure was observed between the two zones as a transitional region in the Al-3.5Mn-1.3Co alloy. The enthalpy differences, ΔH O ne , between a non-equilibrium state in as-melt spun ribbons and the equilibrium state in fully annealed ribbons of the Al-Mn-Co alloys were evaluated using data obtained by differential scanning calorimetry (DSC) measurements. The values of ΔH O ne for Al-Mn-Co alloys are lower than those for Al-Mn binary alloys. ΔH O ne corresponds to a decrease in Gibbs free energy, ΔG, which is stored in a solidified solid during rapid solidification. The formation of the banded structure is interpreted on the basis of an analysis of the distribution of ΔH O ne or the fluctuation in ΔG, which should oscillate in order to correspond with a gradual reduction of cooling ability for the constrained solidification by the substrate.


Polymer Enthalpy Free Energy Differential Scanning Calorimetry Equilibrium State 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Yibin Zhang
    • 1
  • Toshimi Yamane
    • 1
  • Shigeoki Saji
    • 1
  • Junzo Takahashi
    • 2
  1. 1.Department of Materials Science and Engineering, Faculty of EngineeringOsaka UniversityOsakaJapan
  2. 2.Department of Dental Technology, Faculty of DentistryOsaka UniversityOsakaJapan

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