کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969245 | 1514347 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of secondary phase particles on thermal stability of ultra-fine grained Mg-4Y-3RE alloy prepared by equal channel angular pressing
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
As-cast magnesium alloy WE43, containing yttrium and rare earth elements, was processed by equal channel angular pressing (ECAP). The processing led to a significant grain refinement together with a massive precipitation of the secondary phase particles. Thermal stability of the ultra-fine grain (UFG) structure together with microstructural changes due to exposure to elevated temperatures were studied by several complementary techniques in the temperature range of 160-500â¯Â°C. It was found that UFG structure consisting of grains with size of ~340â¯nm and high density of Mg5RE particles is stable up to 280â¯Â°C for 1â¯h of annealing. Moreover, only negligible change of the microstructure occurred after annealing for 16â¯h at 250â¯Â°C. Excellent thermal stability of UFG structure was caused by fine Mg5RE particles, which suppressed the grain growth. Exceeding the limit of thermal stability of these particles above 280â¯Â°C resulted in material softening. Moreover, statistically significant hardening of the UFG material occurred in the temperature range of 200-280â¯Â°C. Segregation of yttrium and rare earth elements and eventually precipitation at grain boundaries was proved to be responsible for observed hardening by in-situ and ex-situ transmission electron microscope and positron annihilation spectroscopy analysis. Finally, individual effect of particles dissolution and grain growth on the material softening was investigated and discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 140, June 2018, Pages 207-216
Journal: Materials Characterization - Volume 140, June 2018, Pages 207-216
نویسندگان
Peter Minárik, Jozef Veselý, Jakub ÄÞek, Mária Zemková, TomáÅ¡ Vlasák, TomáÅ¡ KrajÅák, JiÅà Kubásek, Robert Král, Daniel Hofman, Jitka Stráská,