MAGNETIC-PROPERTIES OF HYDROGEN SOLID-SOLUTIONS IN FE-NI-MN ALLOYS

The magnetization behaviour is investigated in a pulsed magnetic field up to 50 kOe at 80 ≦ T ≦ ≦ 220 K for hydrogen solid solutions in Fe65(Ni1–xMnx)35 invars containing 0, 4.5, 10, 17, 24, 29, and 35 wt% Mn. The alloys are enriched in hydrogen to hydrogen/metal atomic ratio n ⪅ 1 using exposures to PH2 ≦ 70 kbar. The Néel point behaviour is studied at PH2 ≦ 15 kbar for the 35% Mn alloy. The dependence of the parameter of the f.c.c. metal sublattiee on the hydrogen content is measured for the 29% Mn alloy at T = 83 K. The hydrogenation is shown to suppress the antiferromagnetic ordering in manganese‐rich alloys. Above a certain hydrogen concentration nf, each of the studied Me–H solutions becomes ferromagnetic. The Curie points in the ferromagnetic state rise with n increase. At n ≈ 1, the spontaneous magnetization and Curie points of hydrogen solutions in Fe–Ni–Mn alloys reach magnitudes characteristic of Fe–Ni invars. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA