Experimental study of the Ca-Mg-Zn system using diffusion couples and key alloys
Yi-Nan Zhang1, Dmytro Kevorkov1, Florent Bridier2
1Department of Mechanical Engineering, Concordia University, 1455 de Maisonneuve Blvd W, Montreal, Quebec, H3G 1M8, Canada.
Science and Technology of Advanced Materials
|November 24, 2016
Summary
This study maps the Ca-Mg-Zn phase diagram, identifying four ternary intermetallic compounds. Binary compounds exhibit solid solubility, aiding in understanding phase relations for materials science applications.
Area of Science:
- Materials Science
- Physical Chemistry
- Metallurgy
Background:
- Understanding phase diagrams is crucial for developing new alloys.
- The Ca-Mg-Zn system is of interest for its potential applications.
Purpose of the Study:
- To construct the isothermal section of the Ca-Mg-Zn phase diagram at 335 °C.
- To identify and characterize ternary intermetallic compounds in the Ca-Mg-Zn system.
- To investigate the solid solubility of binary compounds in the ternary system.
Main Methods:
- Preparation of diffusion couples and key samples.
- Phase analysis using scanning electron microscopy, electron probe microanalysis, and X-ray diffraction (XRD).
- Crystal structure determination via XRD and electron backscatter diffraction.
Main Results:
- Four ternary intermetallic compounds (IM1-IM4) were identified.
- Extended solid solubility was observed for CaZn11, CaZn13, and Mg2Ca.
- The isothermal section of the Ca-Mg-Zn phase diagram at 335 °C was successfully constructed.
- Diffusion zone morphologies were characterized, showing tooth-like or matrix-precipitate structures.
Conclusions:
- The study provides a comprehensive phase diagram for the Ca-Mg-Zn system at 335 °C.
- The identified ternary compounds and solid solubility behavior offer insights for alloy design.
- Experimental results contribute to the fundamental understanding of multi-component metallic systems.
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