کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1582972 | 1514877 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rapid solidification behaviour of Al2O3/Y3Al5O12 (YAG) binary eutectic ceramic in situ composites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Rapid solidification of Al2O3/Y3Al5O12 (YAG) binary eutectic ceramic in situ composites during the remelting process using high-energy laser, which results in refinement of the solidification microstructure and improvement of the mechanical properties, is studied in this paper. The rapidly solidified Al2O3/YAG eutectic consists of Al2O3 and YAG phases without any other phases, effectively avoiding grain boundaries. The eutectic interspacing is extremely refined due to the high-temperature gradient and solidification rate of laser rapid solidification, and the minimal interspacing is as fine as 0.5 μm. The eutectic exhibits an obvious faceted-faceted eutectic growth characteristic which mainly derives from the high-fusion entropies of eutectic phases and large kinetic undercooling. The mean hardness and fracture toughness measured by an indentation technique are 17.5 GPa and 3.6 MPa m1/2, respectively. The increase of fracture toughness can be attributed to the refinement of eutectic phases which restrain and arrest crack propagations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 479, Issues 1â2, 25 April 2008, Pages 380-388
Journal: Materials Science and Engineering: A - Volume 479, Issues 1â2, 25 April 2008, Pages 380-388
نویسندگان
Haijun Su, Jun Zhang, Chunjuan Cui, Lin Liu, Hengzhi Fu,