Dynamic elastic properties and magnetic susceptibility across the austenite-martensite transformation in site-disordered ferromagnetic Ni–Fe–Al alloy

Abstract

Besides permitting an accurate determination of the ferromagnetic-to-paramagnetic phase transition temperature and the characteristic temperatures for the beginning and end of the growth of martensite (austenite) phase at the expense of austenite (martensite) phase while cooling (heating), the results of an extensive ac susceptibility, sound velocity and internal friction investigation of the thermoelastic martensitic transformation in melt-quenched (sitedisordered) 25 20 55

Critical RF losses in fine particles of La1−xAgyMnO3+δ: Prospects for temperature-controlled hyperthermia

“…1(b) and (c). Note that an increase in the AC susceptibility just below T C was reported previously for various magnetic materials [17][18][19][20][21] including rare-earth manganites [18,20], though in our case the increase in w 00 is much more pronounced. Presently we cannot suggest an ultimate explanation of the revealed phenomenon.…”

Effect of Stress Relaxation on Quenched NiFeAl Ferromagnetic Shape Memory Alloy

“…These values for the characteristic temperatures are consistent with those deduced from the ND data. Previously we have reported on the dynamic elastic properties and magnetic susceptibility across the Austenite-Martensite transformation in this system at a constant stress [13]. Recognizing that the thermoelastic martensitic transformation causes the shape memory effect (SE) and the thermoelastic nature of MT is directly reflected in the elastic property measurements across the Austenite-Martensite phase transformation, extensive measurements of sound velocity and attenuation under varying stress amplitude, on the q-Fe 20 sample, were undertaken using the vibrating reed technique [14][15].…”