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| Experimental study of phase equilibria on Co–Fe-rich side of Co–Al–Fe system |
| Jing‑jing Wang1, Wei‑sen Zheng1, Xiao‑gang Lu1,2, Yan‑lin He1,3, Qing‑rong Yao4, Jiang Wang4 |
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2 Materials Genome Institute, Shanghai University, Shanghai 200444, China
3 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
4 School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China |
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Abstract Despite various studies on Co–Al–Fe ternary system, its phase equilibria are still in doubt. Phase equilibria, magnetic transition and bcc_A2/bcc_B2 order–disorder transformation at the Co–Fe-rich side of the Co–Al–Fe alloys were carefully investigated by means of electron probe microanalysis (EPMA), X-ray diffraction (XRD) and differential scanning calorimetry. The equilibrium phases and their compositions were determined by 18 alloy samples annealed at 900, 1000, 1100 and 1200 °C for 528, 336, 168 and 96 h, respectively, followed by quenching. However, by adopting the above traditional method, bcc_A2 and fcc_A1 phases are difficult to be distinguished through XRD analysis at room temperature due to the martensitic transformation of fcc_A1 phase during quenching. For this reason, high-temperature in situ XRD technique was utilized to correctly establish the phase relationships among bcc_A2, bcc_B2 and fcc_A1 phases. The phase transformation between bcc_A2 and B2 phases was determined to be second order instead of first order at temperatures higher than 900 °C. The equilibrium phases and compositions were further confirmed by fabricating 16 diffusion couples together with EPMA. Meanwhile, using three-dimensional differential scanning calorimetry method, bcc_A2/B2 and ferro-/paramagnetic transitions were determined with high accuracy.
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Received: 01 May 2019
Published: 25 June 2020
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| Cite this article: |
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Jing‑jing Wang,Wei‑sen Zheng,Xiao‑gang Lu, et al. Experimental study of phase equilibria on Co–Fe-rich side of Co–Al–Fe system[J]. Journal of Iron and Steel Research International, 2020, 27(6): 673-680.
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| [1] |
Hai-zhong Zheng, Sheng-hua Guo, Qin-hao Luo, Xiao-yong Shu, Gui-fa Li. Effect of shot peening on microstructure, nanocrystallization and microhardness of Ti–10V–2Fe–3Al alloy surface[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(1): 52-58. |
| [2] |
Yong Yang . Tian-rui Li . Tao Jia . Zhao-dong Wang. A simple calculation model for thermodynamic equilibrium information between precipitation and matrix[J]. , 2018, 25(11): 1156-1162. |
| [3] |
Zhu-jun Jiang,Yu-ye Wu,,Jing-min Wang,Cheng-bao Jiang. Influence of cooling rate on magneto-structural transition and magnetocaloric effect of Ni30Cu8Co12Mn37Ga13 alloy[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 711-717. |
| [4] |
Na Gong,Hui-bin Wu,,*,Gang Niu,Jia-ming Cao,Da Zhang,Tana. Effect of martensitic transformation on nano/ultrafine-grained structure in 304 austenitic stainless steel[J]. , 2017, 24(12): 1231-1237. |
| [5] |
Xiao-gang Wang,Ming-xin Huang,*. Temperature dependence of Lüders strain and its correlation with martensitic transformation in a medium Mn transformation-induced plasticity steel[J]. , 2017, 24(11): 1073-1077. |
| [6] |
Jia JU,Feng XUE,Hong LI. Microstructure and Magnetic Property Variation with Addition of Rare Earth Element Dy in Co-Ni-Al Ferromagnetic Shape Memory Alloy[J]. Chinese Journal of Iron and Steel, 2015, 22(9): 858-863. |
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2020, Vol. 27 
