کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7174782 1465565 2018 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The matrix-twin transition in a perfect Mg crystal: Ab initio study
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
The matrix-twin transition in a perfect Mg crystal: Ab initio study
چکیده انگلیسی
By means of ab initio calculations, we studied the matrix - twin transition in a perfect Mg crystal where the {101¯2} plane is the twinning plane. The twinning transition is described by the shear of a suitable periodically repeated unit cell and by the atomic shuffling inside the unit cell. We found two hcp - hcp paths that can create the glide and reflection {101¯2} twin boundary, respectively. Assuming a perfect hcp crystal, it turned out that the total energy profiles of both hcp - hcp paths are the same. We further pointed out the equivalence between the description of the matrix - twin transition in the frame of an orthorhombic and of a monoclinic unit cell, both containing four atoms. We have tracked the trajectories of the net atomic motion that are energetically very favorable. In addition, the effect of volume relaxation on the total energy profiles was investigated and its influence on the plastic deformation of Mg crystal was discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 108, September 2018, Pages 186-200
نویسندگان
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