کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9796052 1514940 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microhardness mapping and the hardness-yield strength relationship in high-pressure diecast magnesium alloy AZ91
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Microhardness mapping and the hardness-yield strength relationship in high-pressure diecast magnesium alloy AZ91
چکیده انگلیسی
Microhardness maps of cross-sections of high-pressure diecast test bars of AZ91 have been determined. Specimens with rectangular cross-sections, 1, 2 and 3 mm thick, or with a circular cross-section 6.4 mm in diameter, have been studied. The hardness is generally higher near the edges in all specimens, and more so near the corners of the rectangular specimens. The hardness at the center of the castings is generally lower, due to a coarser solidification microstructure and the concentration of porosity. The evidence confirms that the surface of the castings is harder than the core, but it does not support the concept of a skin with a sharp and definable boundary. This harder layer is irregular in hardness and depth and is not equally hard on opposite sides of the casting. The mean hardness obtained by integrating the microhardness maps over the entire cross-section increased with decreasing thickness of the bars, and was found to be in good correlation with each bar's yield strength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 402, Issues 1–2, 15 August 2005, Pages 258-268
نویسندگان
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