中国物理B ›› 2025, Vol. 34 ›› Issue (6): 66203-066203.doi: 10.1088/1674-1056/adca1e

所属专题: SPECIAL TOPIC — Structures and properties of materials under high pressure

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Measurement of the eutectic point of Fe-C alloy under 5 Gpa

Ting Zhang(张亭)1, Xiuyan Wei(魏秀艳)2, Zuguang Hu(胡祖光)2, Jianyun Yang(杨建云)2, Duanwei He(贺端威)1,†, Khalid Nabulsi3, and Guodong (David) Zhan(詹国栋)3,‡   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Drilling Technology Services Company, GWDC, Panjin 124100, China;
    3 Drilling Technology Division, EXPEC Advanced Research Center, Saudi Aramco, Dhahran 31311, Saudi Arabia
  • 收稿日期:2025-03-07 修回日期:2025-04-03 接受日期:2025-04-08 出版日期:2025-05-16 发布日期:2025-05-16
  • 通讯作者: Duanwei He, Guodong (David) Zhan E-mail:duanweihe@scu.edu.cn;guodong.zhan@aramco.com
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2023YFA1406200).

Measurement of the eutectic point of Fe-C alloy under 5 Gpa

Ting Zhang(张亭)1, Xiuyan Wei(魏秀艳)2, Zuguang Hu(胡祖光)2, Jianyun Yang(杨建云)2, Duanwei He(贺端威)1,†, Khalid Nabulsi3, and Guodong (David) Zhan(詹国栋)3,‡   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Drilling Technology Services Company, GWDC, Panjin 124100, China;
    3 Drilling Technology Division, EXPEC Advanced Research Center, Saudi Aramco, Dhahran 31311, Saudi Arabia
  • Received:2025-03-07 Revised:2025-04-03 Accepted:2025-04-08 Online:2025-05-16 Published:2025-05-16
  • Contact: Duanwei He, Guodong (David) Zhan E-mail:duanweihe@scu.edu.cn;guodong.zhan@aramco.com
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2023YFA1406200).

摘要: The eutectic point is a critical parameter in the phase diagrams of solid-liquid equilibrium. In this study, high-pressure differential thermal analysis (HPDTA) was utilized to measure the melting temperatures of Fe-C alloy (3.4-4.2 wt.% C) under 5 GPa and to plot the liquidus temperature curves spanning from hypoeutectic to hypereutectic compositions. Our results indicate that under 5 GPa, the carbon content at the eutectic point of the Fe-C alloy decreases to 3.6-3.7 wt.% C, representing a reduction of approximately 0.6 wt.% C compared to the atmospheric pressure value (4.3 wt.% C). Concurrently, the eutectic temperature rises to 1195 ${^\circ}$C, showing an elevation of 48 ${^\circ}$C relative to the atmospheric pressure condition (1147 ${^\circ}$C). Microstructural analysis, x-ray diffraction (XRD), and hardness tests further corroborate these findings, demonstrating that high pressure significantly suppresses the solubility of carbon in $\gamma $-Fe, resulting in a decrease in the eutectic carbon content. Additionally, the hardness of the Fe-C alloy under 5 GPa is increased by more than 50% compared to that of the same type of Fe-C alloy under atmospheric pressure. This study provides essential experimental data for constructing high-pressure Fe-C phase diagrams and offers valuable insights for the design of high-performance Fe-based materials under extreme conditions

关键词: Fe-C alloy, eutectic point, high pressure and high temperature, high pressure differential thermal analysis

Abstract: The eutectic point is a critical parameter in the phase diagrams of solid-liquid equilibrium. In this study, high-pressure differential thermal analysis (HPDTA) was utilized to measure the melting temperatures of Fe-C alloy (3.4-4.2 wt.% C) under 5 GPa and to plot the liquidus temperature curves spanning from hypoeutectic to hypereutectic compositions. Our results indicate that under 5 GPa, the carbon content at the eutectic point of the Fe-C alloy decreases to 3.6-3.7 wt.% C, representing a reduction of approximately 0.6 wt.% C compared to the atmospheric pressure value (4.3 wt.% C). Concurrently, the eutectic temperature rises to 1195 ${^\circ}$C, showing an elevation of 48 ${^\circ}$C relative to the atmospheric pressure condition (1147 ${^\circ}$C). Microstructural analysis, x-ray diffraction (XRD), and hardness tests further corroborate these findings, demonstrating that high pressure significantly suppresses the solubility of carbon in $\gamma $-Fe, resulting in a decrease in the eutectic carbon content. Additionally, the hardness of the Fe-C alloy under 5 GPa is increased by more than 50% compared to that of the same type of Fe-C alloy under atmospheric pressure. This study provides essential experimental data for constructing high-pressure Fe-C phase diagrams and offers valuable insights for the design of high-performance Fe-based materials under extreme conditions

Key words: Fe-C alloy, eutectic point, high pressure and high temperature, high pressure differential thermal analysis

中图分类号:  (High-pressure effects in solids and liquids)

  • 62.50.-p
74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 61.66.Dk (Alloys ) 64.70.dj (Melting of specific substances)