Internal friction study on fcc/hcp martensitic transformations in thermomechanically treated Fe–28Mn–6Si–5Cr–0.53Nb–0.06C (mass%) alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 442; no. 1; pp. 404 - 408
• Main Authors: Dong, Z., Sawaguchi, T., Kikuchi, T., Yin, F., Ogawa, K., Sahu, P., Kajiwara, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 20-12-2006; Elsevier
• Subjects: Anelasticity, internal friction, stress relaxation, and mechanical resonances; Antiferromagnetic transition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fe-based shape memory alloy; Internal friction; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Martensitic transformation; Martensitic transformations; Materials science; Mechanical and acoustical properties of condensed matter; NbC carbide; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Antiferromagnetic transition; Martensitic transformation; Fe-based shape memory alloy; Internal friction; NbC carbide; FCC lattices; Martensitic transformations; Rolling; Iron alloys; Magnetic transitions; Precipitates; Magnetic susceptibility; Young modulus; Solution heat treatment; Reverse martensitic transformations; Shape memory alloy; Temperature effects; Aging; Thermomechanical treatments; Paramagnetic-antiferromagnetic transitions; HCP lattices; Transition element alloys
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.03.116

We have studied the temperature dependence of the internal friction and Young's modulus of the Fe–28Mn–6Si–5Cr–0.53Nb–0.06C (mass%) alloys with or without NbC precipitates produced by three thermomechanical treatments: (i) solution treatment, (ii) rolling at 870
K and subsequent aging at 1070
K, and (iii) rolling at 1070
K, in the vicinity of the forward (
M
s) and the reverse (
A
s) martensitic transformation temperatures using a dynamic mechanical analyzer (DMA). The specimen subjected to rolling at 870
K and subsequent aging showed the highest
M
s temperature and the largest amount of the hcp martensite. The solution treated specimen showed the lowest
M
s temperature and the minimum amount of the martensite. The magnetic susceptibility measurements made by means of a superconducting quantum interference device (SQUID) revealed that the martensitic transformation is hindered by the preceding magnetic transition from the paramagnetic (cubic) phase to the antiferromagnetic (tetragonal) phase.