کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7210495 1469212 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructures and Microsegregation of Directionally Solidified Mg-1.5Gd Magnesium Alloy with Different Growth Rates
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک مواد
پیش نمایش صفحه اول مقاله
Microstructures and Microsegregation of Directionally Solidified Mg-1.5Gd Magnesium Alloy with Different Growth Rates
چکیده انگلیسی
Directional solidification of Mg-1.5Gd (wt%) magnesium alloy was carried out to investigate the effects of the growth rate on the microstructures under controlled solidification conditions. A Bridgman-type directional solidification furnace with a liquid metal cooling (LMC) technique was used to solidify the specimens, which could provide steady state conditions with a constant temperature gradient (40 K/mm) at a wide range of growth rate (10∼200 μm/s). Results show that the microstructures are cellular, and the relationship between cellular spacing (λ) and growth rate (V) is established in the form: λ = 130.2827V−0.2228 by a linear regression analysis, which is in good agreement with the calculated values by Trivedi model. The thermodynamics solidification path calculations by Scheil model and experimental observations confirm that the solidification microstructure in the alloy consists of primary α(Mg) phase and binary eutectic α(Mg)+Mg5Gd phase. Meanwhile, the microsegregation of the alloying element predicted by the Scheil model agrees reasonably with the electron probe microanalysis (EPMA) measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Rare Metal Materials and Engineering - Volume 46, Issue 1, January 2017, Pages 12-16
نویسندگان
, , ,