کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5456753 1514663 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plastic flows and strain-induced alpha to omega phase transformation in zirconium during compression in a diamond anvil cell: Finite element simulations
ترجمه فارسی عنوان
جریان های پلاستیکی و تحول فاز آلفا به امگا در ناحیه زیرورونیوم در طول فشرده سازی در سلول الماس القایی ناشی از فشار: شبیه سازی اجزای محدود
کلمات کلیدی
تغییرات فازی ناشی از فشار، زیرکونیوم، فشار بالا، سلول زشت الماس، پلاستیک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی
Coupled plastic flows and the strain-induced α→ω phase transformation (PT) in a zirconium sample under compression in a diamond anvil cell are investigated using finite element method (FEM). The PT is treated as strain-induced rather than pressure-induced and the previously developed model for strain-induced PTs is utilized. Very heterogeneous fields of stress tensor, accumulated plastic strain, and concentration of the ω phase are obtained for different applied loads. The PT starts at the center of a sample when pressure exceeds the minimum pressurepεd=1.7GPa, below which a direct strain-induced PT to a high pressure phase cannot occur, and it propagates from the center to the periphery with an increasing load. Even at the maximum pressure of 7 GPa, the PT is not completed everywhere. With an increasing load, the pressure and pressure gradient along the radial direction significantly increase in the two-phase region due to the much larger yield strength of the ω phase. This in turn promotes transformation and produces a positive mechanochemical feedback. Obtained results are utilized for the interpretation of published experimental data on pressure-, stress-, and strain-induced α→ω PTs in Zr and Titanium (Ti) and α→β and ω→β PTs in Zr under compression and high pressure torsion. This includes correcting the reported minimum pressures for these transformations by a factor of 3-6 due to the stress heterogeneity, the effect of transmitting media, the pressure hysteresis, and the reversibility of the transformation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 680, 5 January 2017, Pages 130-140
نویسندگان
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