TY - JOUR
T1 - Microstructure and indentation fracture of dysprosium niobate
AU - Lee, Byong Taek
AU - Kriven, Waltraud M.
N1 - Funding Information:
NSF DMR99-72114. Prof. Byong-Taek Lee was supported by a NRL research program of the Korean Ministry of Science and Technology. This work was carried out in the Center for Microanalysis of Materials, at the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign, which is partially supported by the United States Department of Energy under Grant No. DEFG02-91-ER45439.
Funding Information:
We gratefully acknowledge the assistance of L.F. Siah in preparing the sintered DyNbO4 samples studied. This work was partially supported by a grant from the United States National Science Foundation, under Grant No.
PY - 2005/6
Y1 - 2005/6
N2 - The high-temperature indentation fracture and microstructures of dysprosium niobate (DyNbO4) were investigated by optical, scanning, and transmission electron microscopy (OM, SEM, and TEM). Polycrystalline samples were sintered at 1350 °C for 3 h and cut into 3 mm disks for TEM. The disks were indented in a Nikon QM (Tokyo, Japan) hot hardness indenter at room temperature up to 1000 °C. Many lamellar twins having different widths were observed by TEM as well as intergranular microcracks. The room temperature hardness was relatively low at 5.64 GPa and decreased with elevated temperatures. Crack lengths were short, showing a typical micro-cracking effect. In the sample indented at 1000 °C, dislocations in periodic arrays were evident, and their density increased markedly due to heavy plastic deformation.
AB - The high-temperature indentation fracture and microstructures of dysprosium niobate (DyNbO4) were investigated by optical, scanning, and transmission electron microscopy (OM, SEM, and TEM). Polycrystalline samples were sintered at 1350 °C for 3 h and cut into 3 mm disks for TEM. The disks were indented in a Nikon QM (Tokyo, Japan) hot hardness indenter at room temperature up to 1000 °C. Many lamellar twins having different widths were observed by TEM as well as intergranular microcracks. The room temperature hardness was relatively low at 5.64 GPa and decreased with elevated temperatures. Crack lengths were short, showing a typical micro-cracking effect. In the sample indented at 1000 °C, dislocations in periodic arrays were evident, and their density increased markedly due to heavy plastic deformation.
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U2 - 10.1557/JMR.2005.0202
DO - 10.1557/JMR.2005.0202
M3 - Article
AN - SCOPUS:29044444727
VL - 20
SP - 1422
EP - 1427
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 6
ER -