Dynamic Failure and Fragmentation of a Hot-Pressed Boron Carbide

The effect of boron and aluminum additions on the microstructure of arc‐melted boron carbide

“…In contrast, the Al‐B co‐doped sample is flattened‐out (Figure D), suggesting that its liquid form exhibits a much reduced surface energy. In the boron carbide research community, substantial effort has been devoted to growing an intergranular film (IGF) along grain boundaries to encourage intergranular fracture thus to improve fracture toughness . Unfortunately, due to the high surface energy of B 4 C, the sintering aids tend to segregate at triple points rather than forming IGFs .…”

“…In the boron carbide research community, substantial effort has been devoted to growing an intergranular film (IGF) along grain boundaries to encourage intergranular fracture thus to improve fracture toughness. 13 Unfortunately, due to the high surface energy of B 4 C, the sintering aids tend to segregate at triple points rather than forming IGFs. 11,13 Here, we demonstrate that co-doping Al and B could effectively reduce the surface energy of boron carbide in the liquid phase.…”

“…13 Unfortunately, due to the high surface energy of B 4 C, the sintering aids tend to segregate at triple points rather than forming IGFs. 11,13 Here, we demonstrate that co-doping Al and B could effectively reduce the surface energy of boron carbide in the liquid phase. Thus, the Al-B co-doped boron carbide could be a good candidate for grain boundary engineering by growing IGFs.…”

“…16 Note that arc melting does not lead to homogeneous composition, thus multiple phases of boron carbide could co-exist in one sample. For example, the B 13 To confirm whether Al was incorporated into B 4 C or B 13 C 2 , we analyzed the compositions of these four samples using SEM-based EDS, performing both mapping and point analyses. In the B 4 C + 5 at.% Al sample, the EDS maps showed that Al did not form a solid solution, but second phases instead ( Figure 3A).…”

Applications of analytical electron microscopy to guide the design of boron carbide

“…It should be noted that one effect that has not been considered, that potentially occurs in when analyzing boron carbide with S)TEM-XEDS or EELS, is radiation damage, more specifically knock-on damage A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”