کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620968 | 988754 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystallography and elastic energy analysis of VN precipitates in Fe-Mn-Si-Cr shape memory alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Crystallography and elastic energy analysis of VN precipitates in Fe-Mn-Si-Cr shape memory alloys Crystallography and elastic energy analysis of VN precipitates in Fe-Mn-Si-Cr shape memory alloys](/preview/png/10620968.png)
چکیده انگلیسی
High-resolution electron microscopy investigations are carried out to describe the morphology and crystallography of VN precipitates which are formed in an Fe-28Mn-6Si-5Cr (mass%) shape memory alloy. It is revealed that the shape change from a cube with {1Â 0Â 0} interfaces to an octahedral shape with {1Â 1Â 1} interfaces occurs on aging in the precipitate. In order to identify the equilibrium shape of the VN precipitate, elastic strain energy of the precipitate has been estimated on the basis of microscopic theory of elasticity. It is found that a coherent precipitate (â¼4 nm in edge width) in a cube shape with {1Â 0Â 0} surfaces can be formed, at an early stage of precipitation, with no misfit dislocations existing at the interface of the precipitate. It is also shown that the octahedral-shaped precipitate (â¼15 nm in edge width) has a minimum elastic energy, among the cube-shaped, sphere-shaped and octahedron-shaped precipitates, only when the misfit dislocations are introduced at the interfaces. The elastic interaction energy between the misfit dislocations and the precipitate-misfit dislocations is estimated for the first time using the Fourier transformed microscopic theory of elasticity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 53, Issue 2, 10 January 2005, Pages 419-431
Journal: Acta Materialia - Volume 53, Issue 2, 10 January 2005, Pages 419-431
نویسندگان
Susan Farjami, Kenji Hiraga, Hiroshi Kubo,