کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5456270 1514656 2017 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pre-ageing on dynamic strain ageing in Al-Mg-Si alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Effect of pre-ageing on dynamic strain ageing in Al-Mg-Si alloys
چکیده انگلیسی
The effect of pre-ageing (PA) on dynamic strain ageing (DSA) in Al-Mg-Si alloys with different Mg/Si ratios has been studied by using hardness measurements, tensile testing, three dimensional atom probe (3DAP), and scanning electron microscopy (SEM). The results show that a pre-ageing step prior to one week of natural ageing promotes DSA and gives rise to a reduced strain rate sensitivity (SRS) of the flow stress. Mechanisms for enhanced DSA are discussed in terms of the 3DAP results. It is concluded that the most likely mechanism for the observed decrease in the SRS is associated with the presence of excess vacancies promoted by pre-ageing. The excess vacancies may reside in vacancy-solute complexes (e.g. after pre-ageing at 100 °C for 5 min) or be trapped in clusters (e.g. after pre-ageing at 100 °C for 2 h).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 687, 27 February 2017, Pages 323-331
نویسندگان
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