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AM: Magnetismus

AM 4: Nanokristalline Materialien

AM 4.7: Talk

Monday, March 26, 2001, 16:15–16:30, S 5.4

Phase Transformations in the Fe-Mn System induced by Ball Milling — •Michael Uhrmacher¹, Agnieska Kulinska^1,2, Victor V. Tcherdyntsev³, S.D. Kaloshkin³, A. Maddalena⁴, Gianni Principi⁴, and Yu.V. Baldokhin⁵ — ¹Universität Göttingen, II. Physikalisches Institut, Bunsenstrasse 7/9, D-37073 Göttingen — ²Henryk Niewodniczanski Institut of Nuclear Physics, Krakow, Poland — ³Dep. of Physical Chemistry, Moscow State Steel and Alloys Institut, Leninsky prosp. 4, 117936 Moscow, Russia — ⁴Univ.di Padova, INFM, Settore Materiali, via Marzolo 9, 35131 Padova, Italy — ⁵Semenov Inst. of Physical Chemistry, Russian Academy of Sciences, Kosygina str. 4, Moscow, Russia

High energy ball milling of Fe-Mn elemental powder mixtures has been carried out for different Mn concentrations, ranging from 0% to 90%. X-ray diffraction (XRD), Mössbauer spectroscopy ⁵⁷Fe (MS) and perturbed angular correlation (PAC) with ¹¹¹In probes, implanted at 400 keV into pills made from the milled powders, have been used to investigate the structure of the milled samples. Clear changes of the PAC-patterns occur at a Mn-concentration of 15 - 20% and above 70%. The results of PAC and MS are compared. It is found that ball milling gives rise to concentration ranges of terminal solid solutions more extended than in the equilibrium phase diagram.