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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid State Phase Equilibria of an Al⁻Sn⁻Y Ternary System.

Wenchao Yang1,2,3, Moumiao Liu4,5, Junli Feng6

  • 1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China. ywch053@163.com.

Materials (Basel, Switzerland)
|February 3, 2019
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Summary

This study details the Al-Sn-Y system

Keywords:
Al3Y5 phaseAl–Sn–Y ternary systemphase equilibrium

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Chemistry

Background:

  • Understanding ternary phase equilibria is crucial for developing advanced Al-based structural materials and lead-free solders.
  • The Al-Sn-Y system is critical for applications requiring high-performance alloys.

Purpose of the Study:

  • To investigate the solid-state phase equilibria of the ternary Al-Sn-Y system at 473 K.
  • To map the phase relationships and identify existing phases within this system.

Main Methods:

  • X-ray powder diffraction (XRD) for phase identification.
  • Differential scanning calorimetry (DSC) for thermal analysis.
  • Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) for microstructural and compositional analysis.

Main Results:

  • Confirmed the existence of 12 binary compounds, including controversial phases Sn5Y2 and Al3Y5.
  • The isothermal section at 473 K comprises 15 single-phase, 27 two-phase, and 13 three-phase regions.
  • No ternary compounds were detected, and minimal solid solution was observed at 473 K.

Conclusions:

  • The phase diagram of the Al-Sn-Y system at 473 K has been established.
  • The findings provide essential data for alloy design in structural materials and lead-free solders.
  • The absence of ternary compounds simplifies alloy development within this temperature range.