کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7898604 1510139 2018 29 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanical properties and grain orientation evolution of zirconium diboride-zirconium carbide ceramics
ترجمه فارسی عنوان
ویژگی های مکانیکی و جهت گیری دانه از سرامیک کاربید زیرورونیوم دی بورید و زیرکونیوم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
The effect of ZrC on the mechanical response of ZrB2 ceramics has been evaluated from room temperature to 2000 °C. Zirconium diboride ceramics containing 10 vol% ZrC had higher strengths at all temperatures compared to previous reports for nominally pure ZrB2. The addition of ZrC also increased fracture toughness from ∼3.5MPam for nominally pure ZrB2 to ∼4.3MPam due to residual thermal stresses. The toughness was comparable with ZrB2 up to 1600 °C, but increased to 4.6MPam at 1800 °C and 2000 °C. The increased toughness above 1600 °C was attributed to plasticity in the ZrC at elevated temperatures. Electron back-scattered diffraction analysis showed strong orientation of the ZrC grains along the [001] direction in the tensile region of specimens tested at 2000 °C, a phenomenon that has not been observed previously for fast fracture (crosshead displacement rate = 4.0 mm min−1) in four point bending. It is believed that microstructural changes and plasticity at elevated temperature were the mechanisms behind the ultrafast reorientation of ZrC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 2, February 2018, Pages 391-402
نویسندگان
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