Effect of growth rate on the microstructure and mechanical behavior of directionally solidified Y3Al5O12/MgAl2O4 eutectics
Yükleniyor...
Tarih
2014
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The mechanical properties of YAG-spinel (Y3Al5O12/MgAl2O4) eutectic rods were studied as a function of the solidification rate. Eutectic rods were grown by a laser-heated floating zone method. YAG-spinel eutectic rods measuring 2 mm in diameter and 200 mm in length were grown at rates of 0.1-10 mm/min with a temperature gradient of approximately 1 x 104 [gm. The compressive creep strength of a crystal grown at a rate of 5 mm/min and a now rate of 1.2 mm/min at 1500 degrees C under a strain rate of 1.0 x 10(-4) was only 398 MPa, which is slightly higher than that of crystals grown under different conditions. The highest flexure strength of the Y3Al5O12/MgAl2O4 material at ambient temperature was obtained at a growth rate of 5 mm/min. The maximum hardness reached 16.7 GPa, and the room fracture toughness was 3.9 MPa M-1/2. The changes in the mechanical behavior and the microstructure of the material that occurred at different growth rates are briefly discussed. (C) 2014 Elsevier B.V. All rights reserved
Açıklama
Anahtar Kelimeler
Directional solidification, Eutectics, Floating zone technique, Yttrium aluminum garnet, Magnesium aluminate spinel
Kaynak
Journal of Crystal Growth
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
391
