Mechanical properties and damage tolerance of Y2SiO5
Y2SiO5 has potential applications as functional-structural ceramic and environmental/thermal barrier coating material. As an important grain boundary phase in the sintered Si. IN4. it also influences the mechanical and dielectric performances of the host material. In this paper, we present the mechanical properties of Y2SiO? including elastic moduli, hardness, strength and fracture toughness, and try to understand the mechanical features from the viewpoint of crystal structure. YiSiOs has low shear modulus, low hardness, as well as high capacity for dispersing mechanical damage energy and for resisting crack penetration. Particularly, it can be machined by cemented carbides tools. The crystal structure characteristics of Y2SiOs suggest the low-energy weakly bonded atomic planes crossed only by the easily breaking Y-O bonds as well as the rotatable rigid SiO4 tetrahedra are the origins of low shear deformation, good damage tolerance and good machinability of this material. TEM observations also demonstrate that the mechanical damage energy was dispersed in the form of the micro-cleavages, stacking faults and twins along these weakly bonded atomic planes, which allows the microscale-plastieity for Y2SiO5.
Y2SiOs Mechanical properties Damage Strength Fracture
Ziqi Sun Jingyang Wang Meishuan Li Yanchun Zhou
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of
国际会议
广州
英文
1350-1356
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）