کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1577741 1514805 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deformation twinning in an Fe-6.5 wt.% Si alloy with columnar grains during intermediate temperature compression
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Deformation twinning in an Fe-6.5 wt.% Si alloy with columnar grains during intermediate temperature compression
چکیده انگلیسی

Deformation twinning in coarse-grained body-centered-cubic (BCC) metals with medium to high stacking fault energy only took place during plastic deformation at low temperature or high strain rate conditions. However, in this study deformation twinning was found in an Fe-6.5 wt.% Si alloy (BCC) after intermediate temperature compression by electron backscattered diffraction and transmission electron microscope. Deformation twin with the twinning system of {1 1 2} 〈1 1 1〉 appeared in the Fe-6.5 wt.% Si alloy after compression at 400 °C, strain rate of (2–3) × 10−3 s−1 and compression amount more than 5.8%. Dislocation density inside the deformation twin was much higher than that inside the matrix and the dislocation could slip through most of twin boundary easily. It is indicated that plastic deformation of the Fe-6.5 wt.%Si alloy with columnar grains can be favorably achieved by twinning mechanism at intermediate temperature when the dislocation slip is difficult to activate. On the other hand, deformation twinning can adjust the crystallographic orientation of the grains, which is beneficial to the activation of dislocation slip.


► Twinning was found firstly in Fe-6.5 wt.% Si alloy during compression at 400 °C.
► Twinning makes the grains get better orientation for activating dislocation slip.
► Dislocation density inside the twin is much higher than that inside the matrix.
► Dislocation could slip through most of twin boundary easily.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 538, 15 March 2012, Pages 315–319
نویسندگان
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