کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5455223 1514636 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tension-compression asymmetry in yielding and strain hardening behavior of CP-Ti at room temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Tension-compression asymmetry in yielding and strain hardening behavior of CP-Ti at room temperature
چکیده انگلیسی
The tension-compression asymmetry including the yielding and strain hardening asymmetry of a commercially pure titanium (CP-Ti) at room temperature was studied using uniaxial tensile and compressive tests. The deformation twinning modes responsible for the tension-compression asymmetry were analyzed using the electron back scattered diffraction technology. The CP-Ti exhibits a strong tension-compression asymmetry in yielding and strain hardening. The prismatic 〈a〉 slip is the most easiest to activate either for tension or compression. The deformation twinning mode can be characterized by the secondary {101¯2} twin variants in primary {112¯2} twins for tension and the secondary {112¯2} twin variants in primary {101¯2} twins for compression. The secondary twin variants are the dominated twinning modes whether for tension or compression, determining the final yielding behavior of the titanium. The stress required to activate the secondary extension twins in tension is larger than that to activate the secondary contraction twins in compression, leading to the tension-compression asymmetry in yielding. The strain hardening enhancement of the CP-Ti is a result of the combination of the Hall-Petch hardening by grain refinement and texture hardening by lattice re-orientation both resulting from the deformation twinning. The stronger effect of these two hardening mechanisms on compression than on tension leads to the tension-compression asymmetry in strain hardening.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 707, 7 November 2017, Pages 172-180
نویسندگان
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