Related Experiment Video
Updated: Aug 9, 2025

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
Phase Equilibria of the Fe-Cr-Er Ternary System in the Range 973-1273 K
Chenbo Li1, Yusong Nie1, Rong Yin1
1School of Material Science and Engineering, Central South University, Changsha 410083, China.
Abstract:
Phase relations of the Fe-Cr-Er system in the temperature range 973-1273 K were experimentally investigated using equilibrated alloys. The isothermal sections consisted of 9 single-phase regions, 16 two-phase regions, and 8 three-phase regions at 973 K and 1073 K. At 1273 K, the σ phase disappeared, and liquid appeared. All single phases had a solid solubility range that showed a downward trend with a decrease in temperature. The homogeneity range of the ErFe12-xCrx ternary compound was determined to be x = 1.8-4.5. The more accurate phase relations obtained in this work can better guide the preparation of Fe-Cr-Er alloys in actual production.
Related Concept Videos
Recrystallization: Solid–Solution Equilibria
Phase Transitions: Melting and Freezing
Chemical Equilibria: Redefining Equilibrium Constant
To calculate the equilibrium constants of solutions of moderately high ionic strength, one must account for the salt effect. This redefined...
Chemical Equilibria: Systematic Approach to Equilibrium Calculations
The first step is to identify all the chemical reactions involved, The...
Ladder Diagrams: Redox Equilibria
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Le Chatelier's Principle: Changing Temperature
To understand this phenomenon, consider the elementary reaction:

