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
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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 αâÏ 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 Ï 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 Ï 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 αâÏ PTs in Zr and Titanium (Ti) and αâβ and Ïâβ 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
Journal: Materials Science and Engineering: A - Volume 680, 5 January 2017, Pages 130-140
نویسندگان
Biao Feng, Valery I. Levitas,