Shape memory and associated properties in Fe–Mn–Si-based ribbons produced by melt-spinning

The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation

“…The T N values are rangeing between 244 K si 250 K. The derivative of the magnetization, dM/dT, exhibit another Neel temperature T N , aroud 50 K, which may be associated with the HSHPT induced martensite. Our results for the Neel temperature T Nγ is close to the one reported in [ 43 , 44 , 45 ] for a similar Mn content, while for T Nε our reported value is smaller than previously reported [ 44 ] (T Nε = 173 K). At RT the magnetization did not drop to zero, and the hysterezis curves at RT (see Section 3.5.3 Hysteresis Loops subsection show that the reason for that is the presence of a ferromagnetic component, which we attribute to the phase α‘.…”

“…Magnetic properties of Fe-Mn-Si-Cr alloys are sensitive to the Mn content [ 19 , 38 , 39 , 40 ], and also to the preparation route [ 18 , 19 , 23 , 24 , 41 ]. The alloys with high Mn content favour the ε-γ martensitic transformation and order antiferromagnetically below the Néel temperature [ 20 , 42 , 43 , 44 , 45 , 46 ]. The temperature dependence of the magnetization depicted in Figure 7 a reveals a change in slope at the Néel temperature, T N, from negative in paramagnetic state to positive in antiferromagnetic state and is atributed to the austenitic γ-phase [ 25 , 47 , 48 , 49 , 50 ].…”

“…The low temperature dependence of resistivity for samples C and TC (shown in Figure 10 ) is influenced mainly by the antiferromagnetic ordering of the spins below T N = 244 K, specific to the austenitic γ phase [ 43 ]. On cooling, until the antiferromagnetic order sets in, the resistivity has a metallic behavior, but at lower temperatures, an abnormal increase of the resistivity is observed.…”

The Shape Memory Effect in Melt Spun Fe-15Mn-5Si-9Cr-5Ni Alloys

“…Ribbons produced by melt spinning consist of columnar grains growing from the chill zone, which is the spinning-wheel surface. Donner et al [7] began researching various Fe-(24-30)Mn-(2.6-4.7)Si alloys in 1989, and many years later Valeanu et al [8] focused their studies on the magnetic behaviour of these materials.…”

Microstructure and shape memory properties of Fe–15Mn–5Si–9Cr–5Ni melt-spun ribbons

“…So, this material does not need any heat treatment. Many years passed until Valeanu et al [18] resumed the melt-spinning of Fe-Mn-Si-based alloys, focusing on the role of Mn composition on the magnetic and shape memory properties.…”