Energy conditions for the formation of magnesium hydride
نویسندگان
چکیده
In the present article we consider a novel approach to analyze processes and kinetics of transformation magnesium hydride. Here consists take into account contributions mechanics factors such as work external forces, energy elastic deformation required form unit volume nucleate new phase. Request for stable state either mechanical system or thermodynamic conditions governing phase transformation, is determine minimum value total system. Analyzing stability needed when forming metal hydride nucleus at constant temperature pressure needs following: - volumetric effects ratio moduli phase, spent formation Under these considerations, it was shown that most energetically favorable an ellipsoidal nucleus. Moreover, larger difference in semi-axes, more ellipsoid Then, calculations stress-strain level states on both sides metal/hydride interface have been carried out. It near-boundary range during place where accumulate inhomogeneous intense stresses, which can contribute two parallel processes. Firstly, increase hydrogen concentration could appear distorted area. Secondly, local accumulation incoherent boundaries between phases will develop stresses exceeding by twice shear yield stress. The presence compression zones give rise defects dislocations, micro-cracks. Consequently this should lead decrease magnitude powder material.
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ژورنال
عنوان ژورنال: ??????? ????????? ????????????? ?????????????????? ???????????????? ????????????
سال: 2022
ISSN: ['2224-9893', '2226-1869']
DOI: https://doi.org/10.15593/perm.mech/2022.2.03