کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5454836 | 1514358 | 2017 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat treatment and age hardening of Al-Si-Mg-Mn commercial alloy with addition of Sc and Zr
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Microstructure and precipitation processes in an Al-Si-Mg-Mn-Sc-Zr alloy were studied. The as-cast alloy contains fine Al3(Sc,Zr) particles with L12 structure, rods and/or needles of the Mn,Fe-containing phase and Si,Mg co-clusters. These co-clusters have a detrimental effect on precipitation hardening which is caused exclusively by fine needle-shaped βⳠphase particles. The pronounced precipitation of the Al6(Mn,Fe)-phase was observed during isochronal annealing in the as-cast alloy. Nevertheless, the precipitation has a negligible effect on hardness. The apparent activation energy for the Al6(Mn,Fe)-phase precipitation was calculated as (170 ± 20) kJ·molâ 1. Heat treatment at 530 °C for 45 min dissolves Si,Mg co-clusters but causes a precipitation of the Al12(Mn,Fe)3Si phase particles while the Al3(Sc,Zr) particles remain unaffected. The Sc and Zr addition to the Al-Si-Mg-Mn alloy influences precipitation hardening in the course of isochronal annealing neither in the as-cast nor in the solution-treated alloy. The age hardening is very poor in the as-cast alloy (~ 4%) and it is more pronounced in the solution-treated alloy (~ 60%) due to more convenient size, aspect ratio and number density of the βⳠand βⲠphases. The apparent activation energy values of precipitation of the transient βⳠand βⲠphase were determined as ~ 90 kJ·molâ 1 and ~ 130 kJ·molâ 1, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 129, July 2017, Pages 1-8
Journal: Materials Characterization - Volume 129, July 2017, Pages 1-8
نویسندگان
Martin Vlach, Jakub ÄÞek, Bohumil Smola, Oksana Melikhova, Marián VlÄek, Veronika Kodetová, Hana Kudrnová, Petr HruÅ¡ka,