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

作者: D. Lang , L. Karge , J. Schatte , R. Gilles , R. Dallinger

DOI: 10.1016/J.JALLCOM.2016.06.282

关键词:

摘要: Abstract The powder metallurgically processed molybdenum base alloy MHC (Mo–Hf–C), with a nominal content of 0.65 at.% Hf and C, is considerable interest for high temperature applications. After uniaxial deformation subsequent aging the as-sintered material, plate-like, nm-sized hafnium carbides are formed by heterogeneous nucleation at dislocations. main focus this work was to study evolution size distribution these small gain statistically reliable data from large volume regarding morphology fractions using small-angle neutron scattering (SANS) experiments samples aged 1600 °C different times. Additionally, complementary methods were used support SANS results. Hardness testing, two-stage interrupted compression tests, optical light microscopy, electron backscatter diffraction, scanning transmission microscopy further characterization microstructures as measurements. investigations revealed anisotropic 2D patterns in relation loading direction deformed which assigned not fully compressed pores. It possible analyze thickness fine due streak formation caused an orientation relationship between face centered cubic body matrix. microstructure hardness good agreement results highest after 1 min at exhibiting mean diameter ∼13 nm, plate-thickness ∼3 nm fraction 0.05 vol%. Although, increasing progressing time dropped recovery, recrystallization well particle size.

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