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Suzudo, Tomoaki; Nagai, Yasuyoshi*; Schwen, D.*; Caro, A.*
Acta Materialia, 89, p.116 - 122, 2015/05
Times Cited Count：12 Percentile：51.44(Materials Science, Multidisciplinary)By exploiting Monte Carlo methodology and molecular dynamics, we computationally simulate the spinodal decomposition of iron-chromium binary alloys and analyze the relationship between the increase of yield stress induced by the phase separation phenomenon, and statistical parameters of the atomistic configuration. We successfully model the experimentally-discovered proportional relationship between the hardness and the variation parameter (or V), and also found that the adequacy of the parameter V as an empirical indicator of hardening is limited, because it does not properly capture short-range atomistic configurations that influence the hardening. We suggest that the short-range-order parameter has more potential to become universal descriptor of the phenomenon.
Takahiro, Katsumi*; Kawatsura, Kiyoshi*; Zhang, K.*; Rotter, F.*; Schwen, D.*; Ronning, C.*; Hofs
ss, H.*; Krauser, J.*; Nagata, Shinji*; Yamamoto, Shunya; et al.
no journal, ,
In order to study the allotropic effect on ripple formation on carbon surfaces induced by sputter erosion, three types of carbon materials, highly oriented pyrolytic graphite (HOPG), single crystalline diamond and tetrahedral amorphous carbon (ta-C) films, were irradiated with 5 keV Xe
at an incident angle of 30 degree. The irradiation fluence was 2
10
cm
for all irradiations. No ripples were formed on diamond and ta-C surfaces, while ripples with a wavelength of 
100 nm occurred on HOPG. Electron energy loss spectroscopy revealed that the surfaces of all carbon materials became amorphous with similar densities upon irradiation. Therefore, the presented results clearly show that rippling depends on the nature of the underlying carbon materials. The mechanism for rippling of carbon materials will be discussed.
