Fracture behaviour, microstructure, and performance of various layered-structured Al2O3-TiC-WC-Co composites
نویسندگان
چکیده
In this study, layered-structured Al2O3-based composites containing WC-Co, TiC, and MgO additives were prepared using hot-pressing sintering. The best comprehensive mechanical characteristics acquired for the sample with a layer number (NLN) of 7 thickness ratio (ηTR) 6. Its composite exhibited fracture toughness 8.5 8.4 MPa m1/2 in X Z directions, respectively. Analysis micro surfaces Al2O3-TiC-WC-Co layered revealed significant enhancement bending strength, which could be attributed to mixed modes composite, including intergranular trans-granular modes. As displacement increased, first, stress all increased gradually, after samples showed abrupt elevation stress. damage resistance microscopic macroscopic crack deflection, bridging, partial surface bonding that occurred layers. Finally, new theoretical perspective was employed discuss mechanism effect structure on composites.
منابع مشابه
The Effect of TiC Additive with Al2O3-Y2O3 on the Microstructure and Mechanical Properties of SiC Matrix Composites
In this research, the SiC-matrix composite with different amounts of TiC (0, 2.5, 5, 7.5, and 10 wt%) supplemented with additives including 4.3 wt% Al2O3 and 5.7 wt% Y2O3 were utilized to initiate the required liquid phase. The sintering process was performed using pressureless sintering at 1900 °C for 1.5 hours under argon atmosphere. The compos...
متن کاملThe Hardness and Strength Properties of WC-Co Composites
The industrially-important WC-Co composite materials provide a useful, albeit complicated materials system for understanding the combined influences on hardness and strength properties of the constituent WC particle strengths, the particle sizes, their contiguities, and of Co binder hardness and mean free paths, and in total, the volume fraction of constituents. A connection is made here betwee...
متن کاملInfluence of Microstructure on Residual Thermal Stresses in TiCxN1-x and α-Al2O3 Coatings on WC-Co Tool Inserts
The microstructures of chemical vapor deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter diffraction mapping and these data have been used as input for finite element models used to calculate the residual thermal strains in the coatings. The results indicate that the thermal strains and stored elastic energy in the α-Al2O3 layer are larger...
متن کاملGeometric and Crystallographic Characterization of WC Surfaces and Grain Boundaries in WC-Co Composites
Electron backscattered diffraction has been used to determine the orientation of WC crystals in a WC-Co composite and atomic force microscopy has been used to measure the shapes of planar sections of the same crystals. A stereological analysis has been used to determine that { } 1010 prism facets and the {0001} basal planes are the WC surfaces that are most frequently in contact with Co. Furthe...
متن کاملFRACTURE AND FATIGUE BEHAVIOR OF WC-Co AND WC-CoNi CEMENTED CARBIDES
The fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure. In doing so, the influence of binder chemical nature and content (Co and 76wt%Co-24wt%Ni), as well as carbide grain size on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated. Mechanical testing is combined with a d...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Ceramics International
سال: 2021
ISSN: ['0272-8842', '1873-3956']
DOI: https://doi.org/10.1016/j.ceramint.2021.03.315