کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7971162 | 1514404 | 2013 | 55 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure, microstructural stability and mechanical properties of sand-cast Mg-4Al-4RE alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This paper presents a methodology for assessing the phase composition and the results of structural stability tests of the sand-cast Mg-4Al-4RE alloy after annealing it at 175 and 250 °C for 3000 h. The microstructure was analyzed with optical, scanning electron, and transmission electron microscopy. The phase composition was determined with X-ray diffraction. The structure of the Mg-4Al-4RE (AE44) alloy is composed of large grains of α-Mg solid solution, needle-shaped precipitates of the Al11RE3phase, polyhedral precipitates of the Al2RE phase and Al10RE2Mn7 phase. After annealing at 175 °C for 3000 h, no changes in the alloy structure are observed, whereas after annealing at 250 °C the precipitates of the Al11RE3 phase are found to be in the initial stages of spheroidization. The coarse-grained structure and unfavorable morphology of the intermetallic phases in the sand-cast AE44 alloy, which are caused by low solidification rates, result in low creep resistance up to 200 °C and low mechanical properties at ambient temperature and at 175 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 83, September 2013, Pages 21-34
Journal: Materials Characterization - Volume 83, September 2013, Pages 21-34
نویسندگان
Tomasz RzychoÅ, Andrzej KieÅbus, Lidia LityÅska-DobrzyÅska,