کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5451518 1513712 2017 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of homogenization on the microstructure and mechanical properties of the repetitive-upsetting processed AZ91D alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد شیمی مواد
پیش نمایش صفحه اول مقاله
Effect of homogenization on the microstructure and mechanical properties of the repetitive-upsetting processed AZ91D alloy
چکیده انگلیسی
The current research investigates the effect of homogenization on the microstructure and mechanical properties of the AZ91D alloy processed by repetitive upsetting (RU). Results show that during RU processing, the initial large Mg17Al12 particles in the as-cast specimen accelerate the dynamic recrystallization (DRX) due to the particle stimulating nucleation (PSN) mechanism. With the progress of RU, the inherent large strain breaks the large second phases into small fragments, which indicates the PSN gradually disappears, while the pinning effect becomes obvious. As for the homogenized specimen, a pre-heat treatment leads to the absence of Mg17Al12 particles but a uniform distribution of Al atoms in the Mg alloy. Though the subsequent RU promotes the precipitation of Mg17Al12 particles, the relatively small particle size and the uniform distribution are more favorable to act as obstacles for grain growth than contributors to PSN. Finally, a more homogeneous and refined microstructure is obtained in the specimen with prior homogenization than the as-cast one.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Science & Technology - Volume 33, Issue 9, September 2017, Pages 935-940
نویسندگان
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