Synchrotron X-ray diffraction measurements of internal stresses during loading of steel-based metal matrix composites reinforced with TiB2 particles

Fatigue and fracture of a 316 stainless steel metal matrix composite reinforced with 25% titanium diboride

“…It can be noted that a considerable amount of fractured particles showed characteristics of multiple fracture initiation sites (see Figure 8c). As the typical mechanism of failure for the reinforcement was fracture and not interfacial debonding (which is supported by internal stress measurements reported previously [23]), this indicates that the bonding between the matrix and reinforcement is strong and is not a limiting factor in fatigue damage. The failure of the reinforcing particles results in increasing amounts of load being placed onto the matrix, causing it to fail through ductile mechanisms.…”

In situ synchrotron high-energy X-ray diffraction study of microscopic deformation behavior of a hard-soft dual phase composite containing phase transforming matrix

“…6(c)), the relative peak intensities of (100) and (111) increased whereas those of (1 11), (020), (011) and (001) decreased. In the transverse 32 , olive circle 33 , dark cyan downtriangle 17 , magenta lefttri 34 , dark yellow righttri 16 , navy diamond 35 , wine pentagon 18 , pink circle 36,37 ]. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)…”

In situ synchrotron X-ray diffraction study of deformation behavior and load transfer in a Ti2Ni-NiTi composite

“…This is entirely different from the previously reported dual-phase composites where, due to the plastic misfit induced by dislocation slip of the soft phase, the load is always transferred from the soft component to the hard component. 7,9,17,20 We conjecture that the plastic misfit caused by the martensite variant reorientation (detwinning) is lower than the plastic mismatch induced by dislocation slip, and thus results in very little or no load transfer between NiTi and Ti 2 Ni during the stage of martensite variant reorientation (detwinning).…”

“…18,20 These kinds of dual-phase composites exhibit significant differences in their mechanical behavior as compared to traditional MMCs. 7,8,17,19 In the previously reported nanostructured-matrix composites or bulk metallic glasses matrices composites, the ductile dendrites flow occurs primarily by dislocation slip.…”

“…[5][6][7][8][9][10][11][12] In the past two decades, with the goal of improving the plasticity of high-strength but brittle materials (such as nanostructured materials and bulk metallic glasses), ductile dendrites with lower yield strength were introduced to embed in these high-strength but brittle matrices.…”