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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Study on High-Temperature Interaction Mechanism of Nd-Fe-As System
Chenghui Fu1,2, Run Huang3,4, Wenhao Xie5,6
1School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China. gzu_fch@163.com.
Materials (Basel, Switzerland)
|September 25, 2019
Summary
This study investigated the high-temperature interaction of neodymium (Nd) and arsenic (As) within an iron (Fe) system. Results reveal distinct phase formations and diffusion behaviors at elevated temperatures, crucial for understanding Nd-Fe-As material properties.
Area of Science:
- Materials Science
- Metallurgy
- Solid-state Chemistry
Background:
- Understanding ternary systems like Neodymium-Iron-Arsenic (Nd-Fe-As) is vital for developing advanced materials.
- High-temperature interactions dictate phase stability and compound formation.
Purpose of the Study:
- To investigate the high-temperature interactions in the Nd-Fe-As ternary system.
- To analyze the effect of varying temperatures on phase formation and diffusion.
Main Methods:
- Samples of industrial pure iron (Fe) cylinders sealed with Nd and As.
- Heat treatment at 1173 K, 1223 K, and 1273 K for 30 hours.
- Analysis using X-ray diffraction, optical microscopy, and scanning electron microscopy.
Main Results:
- Common products observed: NdAs, Fe17Nd2, and Fe.
- Fe12As5 formed at 1173 K; Fe2As formed at 1223 K and 1273 K.
- Neodymium (Nd) diffusion is slower than Arsenic (As); Nd diffuses via vacancies, while As forms Fe-As compounds.
Conclusions:
- Temperature significantly influences phase formation in the Nd-Fe-As system.
- Differential diffusion rates of Nd and As impact compound formation.
- The study provides insights into the high-temperature behavior of Nd-Fe-As alloys.
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