| Autor: |
Ovchinnikov, V., Gushchina, N., Ovchinnikov, S. |
| Zdroj: |
Physics of Metals & Metallography; Dec2015, Vol. 116 Issue 12, p1234-1243, 10p |
| Abstrakt: |
The results of the Mössbauer and resistometric studies of the atom redistribution and peculiarities of the α(bcc) → γ(fcc) structure-phase transformation in the Fe + 8.25 at % Mn alloy under irradiation by Ar ions ( E = 20 keV, j = 50-100 μA/cm) and heating by a light beam with a comparable power are presented. The Cowley parameter α of short-range atomic order, the number and composition of the α and γ phases formed during α → γ transition are calculated. An alternative character of atom redistribution in the quenched alloy caused by irradiation with ions at 250°C (atomic ordering, α < 0) and at 420°C (short-range separation, α > 0) is established. Exposure to the light beam does not cause a redistribution of atoms at 250°C (α = 0). At a temperature of 420°C, exposure to an ion beam repeatedly (1-2 orders of magnitude) accelerates the short-range atomic separation in the alloy and initiates the subsequent transformation of the enriched (up to ~18 at % Mn) zones into the γ phase. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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