ZrO2-YO1.5-TaO2.5 (ZYTO) composite ceramics are considered to be a candidate for next-generation thermal barrier coatings (TBCs) due their excellent stability and low conductivity in high temperatures; however, the mechanical properties fracture toughness of ZYTO system may shortcomings compared with 7-8YSZ: traditional TBC. In this study, were successfully prepared by chemical coprecipitation ...

Nacre-like aluminas are bio-inspired, ceramic-based composites that display high toughness and strength. Their arises from their brick-and-mortar microstructure. We must understand the role of several microstructural features over mechanical properties. Techniques allow imaging during tests therefore desired. Here, we use both in situ fluorescence spectroscopy to image stress field around crack...

The rate-dependent fracture behavior of a 10-phr rubber-modified epoxy was investigated using double-cantilever-beam tests at various crosshead speeds. Dramatic rate effects were observed in the R-curve behavior and in the relationship between the applied energy-release rate and the crack velocity. Furthermore, a transition between fracture with toughening mechanisms operating (kinetic crack gr...

The effects of HfB₂ and HfN additions on the microstructures and mechanical properties of TiB₂-based ceramic tool materials were investigated. The results showed that the HfB₂ additive not only can inhibit the TiB₂ grain growth but can also change the morphology of some TiB₂ grains from bigger polygons to smaller polygons or longer ovals that are advantageous for forming a relatively fine micro...

The giant panda׳s teeth possess remarkable load-bearing capacity and damage resistance for masticating bamboos. In this study, the hierarchical structure and mechanical behavior of the giant panda׳s tooth enamel were investigated under indentation. The effects of loading orientation and location on mechanical properties of the enamel were clarified and the evolution of damage in the enamel unde...

The effect of fiber orientation on the toughening of polymers by short glass fibers generally below their critical length was investigated using specimens with either well-aligned or randomly oriented fibers. The fibers were aligned by an electric field in a photopolymerizable monomer, which was polymerized while the field was still being applied. These materials were fractured with the aligned...

Boron-containing molybdenum silicides have been the focus of significant research of late due to their potentially superior lowtemperature ‘‘pest’’ resistance and high-temperature oxidation resistance comparable to that of MoSi2-based silicides; however, like many ordered intermetallics, they are plagued by poor ductility and toughness properties. Of the various multiphase Mo–Si–B intermetallic...