Abstract
Fe36Ni18Mn33Al13 is a lamellar two-phase alloy comprising a hard, Ni,Al-rich B2 phase measuring ~500 nm in width and a ductile, Fe,Mn-rich f.c.c. phase ~1 µm in width. Upon cold rolling and annealing, the as-cast microstructure is replaced by discrete, recrystallized ~1 µm-sized grains consisting of the f.c.c. phase and a 7R (14 M) martensite phase. The formation of the latter phase appears to be related to the change in composition of the phases upon recrystallization. Room-temperature tensile tests performed on 50 % cold-worked and annealed Fe36Ni18Mn33Al13 reveal that complete recrystallization does not occur until after 24 h of annealing at 900 °C, wherein the yield strength and elongation to fracture of the recrystallized alloy are ~443 MPa and 21 %, respectively—a change from the as-cast alloy’s values of ~352 MPa and ~28 %.
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This research was supported by the US Department of Energy (DOE), Office of Basic Energy Sciences grant DE-FG02-07ER46392. The views and conclusions obtained herein are those of the authors and should not be interpreted as necessarily representing official policies, either expressed or implied of the DOE or the U.S. Government.
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Wu, M., Munroe, P.R. & Baker, I. Martensitic Phase Transformation in a f.c.c./B2 FeNiMnAl Alloy. J Mater Sci 51, 7831–7842 (2016). https://doi.org/10.1007/s10853-016-0015-4
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DOI: https://doi.org/10.1007/s10853-016-0015-4