Microstructure and Super-Elasticity of Fe-33Mn-17Al-8.5Ni (at. %) Alloy for Structural Applications

Abstract:

The control of the residually stressed γ’-FCC phase in the grain boundaries that affects super-elasticity in the promising Fe-Mn-Al-Ni shape memory alloy (SMA) and grain size enhancement was an epitome for research in the current study. New composition Fe-33Mn-17Al-8.5Ni (at. %) was designed with the help of thermocalc software TCFE 11 database, produced in an electric arc furnace under an argon atmosphere and systematically investigated in the as-cast and heat-treated conditions. Characterization was performed using optical microscopy, X-ray diffraction measurements (XRD), and compression tests. Controlling the cooling conditions after heat treatment (HT) with high flowrate air cooling helped to reduce on the formation of the detrimental phase, γ’ at the grain boundaries as well as observed some grain growth in the microstructure without necessarily causing cracking as reported previously with quenching in cold water. The yield strength depicting the stress-induced martensitic transformation was 925 MPa for as cast and 909 MPa upon heat treatment. From cyclic compression loading/deloading training, a recovery strain of 2.1% and 2.3% was attained at 800 MPa maximum stress in the as-cast and heat treated-conditions, respectively.

• Periodical: Solid State Phenomena (Volume 356)
• Pages: 3-8
• DOI: https://doi.org/10.4028/p-LtJ0kd
• Online since: March 2024
• Authors: Paul Kamugisha*, Mohamed F.M. Fahmy, Ayman Ali Ahmed Nada, Mohamed Abdel Hady Gepreel
• Keywords: Phase Stability, Stress-Induced Martensitic Transformation, Structural Applications, Super-Elasticity

References

[1] S. Zareie, A. Issa, R. Seethaler, and A. Zabihollah, "Recent advances in the applications of shape memory alloys in civil infrastructures: a review. structures 27: 1535-1550," 2020.

DOI: 10.1016/j.istruc.2020.05.058

[2] T. Omori, K. Ando, M. Okano, X. Xu, Y. Tanaka, I. Ohnuma, R. Kainuma, and K. Ishida, "Superelastic effect in polycrystalline ferrous alloys," Science, vol. 333, no. 6038, pp.68-71, 2011.

DOI: 10.1126/science.1202232

[3] P. Krooß, J. Günther, L. Halbauer, M. Vollmer, A. Buchwalder, R. Zenker, H. Biermann, and T. Niendorf, "Electron beam welding of fe-mn-al-ni shape memory alloy: microstructure evolution and shape memory response," Functional Materials Letters, vol. 10, no. 04, p.1750043, 2017.

DOI: 10.1142/s1793604717500436

[4] W. Abuzaid, Y. Wu, R. Sidharth, F. Brenne, S. Alkan, M. Vollmer, P. Krooß, T. Niendorf, and H. Sehitoglu, "Femnnial iron-based shape memory alloy: promises and challenges," Shape Memory and Superelasticity, vol. 5, pp.263-277, 2019.

DOI: 10.1007/s40830-019-00230-9

[5] T. Omori, M. Nagasako, M. Okano, K. Endo, and R. Kainuma, "Microstructure and martensitic transformation in the fe-mn-al-ni shape memory alloy with b2-type coherent fine particles," Applied Physics Letters, vol. 101, no. 23, 2012.

DOI: 10.1063/1.4769375

[6] M. Vollmer, C. Segel, P. Krooß, J. Günther, L. Tseng, I. Karaman, A. Weidner, H. Biermann, and T. Niendorf, "On the effect of gamma phase formation on the pseudoelastic performance of polycrystalline fe-mn-al-ni shape memory alloys," Scripta Materialia, vol. 108, pp.23-26, 2015.

DOI: 10.1016/j.scriptamat.2015.06.013

[7] M. Vollmer, P. Krooß, I. Karaman, and T. Niendorf, "On the effect of titanium on quenching sensitivity and pseudoelastic response in fe-mn-al-ni-base shape memory alloy," Scripta Materialia, vol. 126, pp.20-23, 2017.

DOI: 10.1016/j.scriptamat.2016.08.002

[8] T. Omori, H. Iwaizako, and R. Kainuma, "Abnormal grain growth induced by cyclic heat treatment in fe-mn-al-ni superelastic alloy," Materials & Design, vol. 101, pp.263-269, 2016.

DOI: 10.1016/j.matdes.2016.04.011

[9] J. M. Vallejos, M. F. Giordana, C. E. Sobrero, and J. Malarria, "Phase stability of three fe- mn-al-ni superelastic alloys with different al: Ni ratios," Shape Memory and Superelasticity, vol. 7, no. 3, pp.362-372, 2021.

DOI: 10.1007/s40830-021-00337-y