Evolution of strain-induced hafnium carbides in a molybdenum base Mo–Hf–C alloy studied by small-angle neutron scattering and complementary methods

Complementary High Spatial Resolution Methods in Materials Science and Engineering

“…[24] It is suggested that these detector images would have been isotropic for the as-deformed MHC, if the incident neutron beam had been parallel to the LD as recently observed by Gu and Mildner. [24] It is suggested that these detector images would have been isotropic for the as-deformed MHC, if the incident neutron beam had been parallel to the LD as recently observed by Gu and Mildner.…”

“…[24] It is suggested that these detector images would have been isotropic for the as-deformed MHC, if the incident neutron beam had been parallel to the LD as recently observed by Gu and Mildner. [24][25][26] Separate investigations in order to quantify these contributions are already in progress. [24][25][26] Separate investigations in order to quantify these contributions are already in progress.…”

“…Additionally, a slight streak formation is visible in the full detector image of the deformed and aged sample condition (Figure 3b), suggesting the overlap of the above mentioned Porod-like background signal with the signal resulting from nm-sized HfC particles. [24] Therefore, the elliptic Porod-like background signal was calculated using the approach proposed by Ciccariello et al, [26] and then subtracted from the total detector signal. Texture measurements reported in a recent study have revealed that more than 50 vol% of the Mo matrix have a preferential orientation after uniaxial deformation with w ¼ 0.30.…”

“…These streaks originate from the special alignment of the small strain-induced carbides, which precipitate during aging in the textured matrix of deformed MHC. [24] Simultaneously, the streaks resulting from the plate-like shaped, nm-sized HfC particles were analyzed using the 3D form factor for cylinders, additionally including the findings of De Geuser et al [20,24] For a detailed description of the used model, the reader is referred to the recent work of Lang et al [24] In order to visualize the streak formation caused by the small HfC particles, the anisotropic Porod-like background signal, which covers sizes >300 nm, was calculated and subsequently subtracted from the full detector signal revealing the residual signal for the nmsized HfC precipitates. [4] This means that also more than 50 vol% of the nm-sized HfC particles have a distinct alignment to the incident neutron beam, which results in the formation of streaks.…”

“…[4] This means that also more than 50 vol% of the nm-sized HfC particles have a distinct alignment to the incident neutron beam, which results in the formation of streaks. [24,26] For the as-deformed condition, a cross-shaped signal remained after subtraction of the anisotropic background. [24] Therefore, the elliptic Porod-like background signal was calculated using the approach proposed by Ciccariello et al, [26] and then subtracted from the total detector signal.…”