کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7880869 1509591 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Why are {101¯2} twins profuse in magnesium?
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Why are {101¯2} twins profuse in magnesium?
چکیده انگلیسی
We show that {101¯2} twinning in magnesium acts as an effective sink of basal dislocations without loss of mobility. The lattice dislocation decomposes into the b0/0BP dislocation recently identified by the present authors, and a residual dislocation. The b0/0BP dislocation in turn spontaneously decomposes into a Burgers vector content of the basal-prismatic facet related disclination dipole, f0BP, plus an associated number of twinning disconnections. The residual dislocation lies on the basal-prismatic facet and thus remains glissile should the twin boundary move forward or recede back. Importantly, the basal-prismatic facet absorbs any twinning disconnection gliding on one side of the twin boundary and releases another one to other side, thereby enabling the twin boundary to progress through a forest of basal dislocations with no apparent decrease in mobility or loss of coherency. This mechanism explains why {101¯2} twinning is profuse in hexagonal close-packed metals as slip induces the interfacial atomic structure to change favorably for twin propagation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 85, 15 February 2015, Pages 354-361
نویسندگان
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