Nuclear Data Sheets for A = 113
This evaluation for A = 113 updates one by J. Blachot, (2005Bl05), published in Nuclear Data Sheets 104, 791 (2005)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
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Processing and properties of PSZT 95/5 ceramics with varying Ti and Nb substitution
Niobium doped lead-tin-zirconate-titanate ceramics near the PZT 95/5 orthorhombic AFE – rhombohedral FE morphotropic phase boundary Pb 1-0.5y (Zr 0.865-x Ti x Sn 0.135 ) 1-y Nb y O 3 were prepared according to a 2 2+1 factorial design with x = 0.05, 0.07 and y = 0.0155, 0.0195. The ceramics were prepared by a traditional solid-state synthesis route and sintered to near full density at 1250°C for 6 hours. All compositions were ~98% dense with no detectable secondary phases by XRD. The ceramics exhibited equiaxed grains with intergranular porosity and grain size was ~5 μm, decreasing with niobium substitution. Compositions exhibited remnant polarization values of ~32 μC/cm 2 , increasing with Ti substitution. Depolarization by the hydrostatic pressure induced FE-AFE phase transition was drastically affected by variation of the Ti and Nb substitution, increasing at a rate of 113 MPa / 1% Ti and 21 MPa / 1% Nb. Total depolarization output was insensitive to the change in Ti and Nb substitution, ~32.8 μC/cm 2 for the PSZT ceramics. The R3c-R3m and R3m-Pm3m phase transition temperatures on heating ranged from 90 to 105°C and 183 to 191°C, respectively. Ti substitution stabilized the R3c and R3m phases to higher temperatures, while Nb substitution stabilized the Pm3m phase to lower temperatures. Thermal hysteresis of the phase transitions was also observed in the ceramics, with transition temperature on cooling being as much as 10°C lower.
36 MATERIALS SCIENCE↗
Effect of microstructure and crystallographic texture on mechanical anisotropy of Ti-Nb microalloyed hot rolled 800 MPa HSLA steel
Highlights: • Anisotropy in yield strengthis attributed to the relatively stronger {332} . • γ-fiber with counter-balancing {111} and {111} could not induce anisotropy. • The maximum CVN value at 0° is attributed to the higher fraction of {113} and {112} . • The large anisotropy in CVN value, ~ 100 J is observed due to a weaker {332} and {554} . - Abstract: The impact toughness of a Ti+Nb HSLA steel plate, conventionally hot rolled in the austenitic region, were measured at four different directions at 0 °C, −20 °C and −40 °C respectively. The microstructure was characterised using light optical microscope, scanning electron microscope (SEM) followed by evaluation of hot rolled texture using X-ray diffraction (XRD) and orientation distribution function (ODF) obtained from electron back-scattered diffraction (EBSD). The anisotropy in the yield strength (YS) and Charpy impact toughness (CVN) were examined in the light of orientation distribution function (ODF) obtained from EBSD. The skeleton lines, showing intensity distribution, f(g), of the fcc-to-bcc transformation texture, namely the α-fiber (<110>∥ RD), the γ-fiber (<111>∥ ND) and ε-fiber (<110>∥ TD) are considered to explain the observed anisotropy along with microstructural features. The major components like, {112}<110>, {113}<110>, {332}<113>, {111}<112> and {111}<110>, their relative intensity distribution, are found to cause the observed anisotropy in yield strength and impact toughness. A stronger presence of {113}<110> component of the α-fiber over relatively weaker {332}<113> component of the ε-fiber further augments the observed toughness anisotropy. In absence of any microstructural banding, strong the presence of {113}<110> and {112}<110> can also cause delamination in ductile fracture mode.
36 MATERIALS SCIENCE↗
Formation of {332}<113>β twins from parent {130}<310>α″ plastic twins in a full α″ Ti-Nb alloy by annealing
Highlights: • The solution-treated, deformed and annealed structures of a full α″ martensitic Ti-23Nb (at.%) alloy have been investigated. • The self-accommodated feature of the α″ martensites is presented by EBSD. • The martensites transform into β phase after annealing and the β phase is retained to room temperature by furnace-cooling. • Direct evidence is given for the formation of {332}{sub β} twins from {130}{sub α″} plastic twins by ex-situ EBSD observations. • A possible {351}<1 1-bar 2>{sub α″} twinning in α″ phase that corresponds to {332}<11 3-bar >{sub β} is proposed. - Abstract: The solution-treated (ST), deformed and subsequently annealed microstructures of a full α″ martensitic Ti-23Nb at.% alloy have been investigated by optical micrograph (OM), X-ray diffraction (XRD) and electron back-scattered diffraction (EBSD). The results show that both the self-accommodated α″ martensites in ST sample and re-orientated martensitic structure and plastic {130}{sub α″} twins in the Deformed sample fully transformed into the β phase with a small amount of the ω phase by annealing. The ex-situ EBSD measurements showed that the {332}{sub β} twins occur in the Annealed sample, which correspond to the {130}{sub α″} plastic twins of the α″ phase in the Deformed sample, and thus give a direct evidence that the {332}{sub β} twins in the β phase form from the reverse martensitic transformation of the {130}{sub α″} plastic twins in the α″ phase. Moreover, it's also expected from EBSD results that in addition to {130}<3 1-bar 0>{sub α″}, the possible <{351}<1 1-bar 2>{sub α″} twinning system of the α″ phase corresponds to the {332}<11 3-bar >{sub β} twinning of the β phase.
36 MATERIALS SCIENCE↗