Direct measurement of elastic modulus of Nb3Sn using extracted filaments from superconducting composite wire and resin impregnation method

Elastic Anisotropy in Multifilament <inline-formula> <tex-math notation="TeX">$\hbox{Nb}_{3}\hbox{Sn}$</tex-math></inline-formula> Superconducting Wires

“…Nevertheless, the higher E-moduli of the RRP wire and filaments with respect to those of PIT wire and filaments could be explained partly by the higher Nb3Sn E-modulus in axial direction in the RRP wire. Similar RT Nb3Sn E-moduli have been published elsewhere [22,23,24]. The Young's modulus obtained by averaging the single crystal data from [12] dramatically harden below the phase transformation temperature TM, while the moduli obtained from ultrasonic data exhibit a smooth profile with almost no hardening below TM as demonstrated in [25].…”

A Study of the Effect of 5 at.% Sn on the Micro-Structure and Isothermal Oxidation at 800 and 1200 °C of Nb-24Ti-18Si Based Alloys with Al and/or Cr Additions

“…The formation of oxides, the enrichment of the surface areas with Sn prior to the formation of Sn rich intermetallics, the contamination of existing phases like Nb ss , Nb 5 Si 3 , and Nb 3 Sn, and the formation of Sn rich intermetallics must have been accompanied with increased defect density and internal stress levels arising from differences in the density of phases, their coefficients of thermal expansion, and moduli of elasticity. For example, the moduli of elasticity of Nb, βNb 5 Si , αNb 5 Si 3 and Nb 3 Sn respectively are 105, 269, 291 [39], and 173 GPa [36], but for Nb 3 Sn, the values of 127 GPa [40], 195 GPa [41], and 132 GPa [42] have been reported, the latter for 273 • C. Furthermore, the modulus of elasticity of Nb 6 Sn 5 is 144 GPa [36] and of Nb 3 Al (which has the A15 structure like the Nb 3 Sn) is 164 GPa [34] or 193 GPa [41]. The CTE (coefficient of thermal expansion) of Nb is 7.6 × 10 −6 K −1 and of Nb 3 Sn is 10.3 × 10 −6 K −1 [43].…”

Ab initio theory of the impact of grain boundaries and substitutional defects on superconducting Nb3Sn

“…For a simple estimate of a grain boundary energy, we follow reference [77] to estimate the amount of elastic work done to create a surface based on the material's elastic modulus. Since Nb 3 Sn has a elastic modulus of ∼ 127 GPa [78], we expect grain boundary energies roughly in the range of 700-1500 mJ m −2 . Table 1 lists a selection of relaxed tilt and twist grain boundary cells with the fourth column indicating the surface formation energy of each boundary.…”