The solid state amorphisation reaction in a Ni50Mo50 alloy has been investigated by neutron diffraction and small angle scattering for a series of specimens mechanically alloyed for 2, 4, 8, 16 and 32 h. In the initial stages of the reaction, deformation of the parent crystalline phases occur. After 8 h of treatment, a change in the samples is observed and those treated for 16 and 32 h consist of an amorphous NiMo phase with some free molybdenum. Small angle scattering graphs of log I(Q) vs. log Q show a sequence of changes which correspond to the sequence of changes seen in the diffraction data, The graphs for the 2 and 4 h samples are linear over an extended range of scattering vector, Q. The slope of the graphs is about -3.4 which is indicative of a rough surface having fractal character between the transformed and untransformed regions of the samples
NEUTRON-DIFFRACTION AND NEUTRON SMALL-ANGLE SCATTERING STUDY OF THE AMORPHIZATION REACTION IN NI50MO50 / Meiya, L; Enzo, Stefano; Soletta, I; Cowlam, N; Cocco, G.. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - 156:(1993), pp. 116-119. [10.1016/0022-3093(93)90142-K]
NEUTRON-DIFFRACTION AND NEUTRON SMALL-ANGLE SCATTERING STUDY OF THE AMORPHIZATION REACTION IN NI50MO50
ENZO, Stefano;
1993-01-01
Abstract
The solid state amorphisation reaction in a Ni50Mo50 alloy has been investigated by neutron diffraction and small angle scattering for a series of specimens mechanically alloyed for 2, 4, 8, 16 and 32 h. In the initial stages of the reaction, deformation of the parent crystalline phases occur. After 8 h of treatment, a change in the samples is observed and those treated for 16 and 32 h consist of an amorphous NiMo phase with some free molybdenum. Small angle scattering graphs of log I(Q) vs. log Q show a sequence of changes which correspond to the sequence of changes seen in the diffraction data, The graphs for the 2 and 4 h samples are linear over an extended range of scattering vector, Q. The slope of the graphs is about -3.4 which is indicative of a rough surface having fractal character between the transformed and untransformed regions of the samplesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
