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Properties, crystallization mechanism and microstructure of lithium disilicate glass-ceramic
, Article Journal of Non-Crystalline Solids ; Volume 356, Issue 4-5 , 2010 , Pages 208-214 ; 00223093 (ISSN) ; Nemati, A ; Shabanian, M ; Afshar, A ; Sharif University of Technology
Abstract
In this study, lithium disilicate glass-ceramic in the TiO2-ZrO2-Li2O-CaO-Al2O3-SiO2 system was investigated for dentistry applications by incorporation of P2O5 and Nb2O5 as nucleation agent. The influence of the particles size (nano and submicron size) and nucleating agents on the crystalline phases, microstructure, crystallization mechanism and mechanical properties were investigated. Our data indicated that in ceramic glass with nano and submicron P2O5, the main crystalline phase was lithium disilicate. The results also showed that change of P2O5 particle's size had significant effect on the crystalline phases and microstructure. By replacement of submicron P2O5 with submicron Nb2O5,...
Constrained groove pressing of low carbon steel: Nano-structure and mechanical properties
, Article Materials Science and Engineering A ; Volume 527, Issue 16-17 , 2010 , Pages 4043-4049 ; 09215093 (ISSN) ; Kazeminezhad, M ; Kokabi, A. H ; Sharif University of Technology
2010
Abstract
In this study a severe plastic deformation method called constrained groove pressing (CGP) is used for imposing a high magnitude of strain into the low carbon steel sheets. Microstructural changes during process are examined by X-ray diffraction and optical observations. The grain size evolution during severe plastic deformation is studied using Williamson-Hall analysis on XRD pattern of the deformed samples. In effective strain of 4.64, ferrite grains with a submicron size of 200-300nm are achieved. The results show that constrained groove pressing can effectively refine the coarse-grained structure to an ultra fine grain range. Mechanical properties changes due to microstructure evolution...