Grain boundary deformation in uniaxial strained Nb3Sn

被引：2

作者：

Qiao, Li ^{[1
]}

Yang, Jiachao ^{[1
]}

Yang, Xujia ^{[1
]}

Han, Ke ^{[2
]}

Li, Zhiqiang ^{[1
]}

Xiao, Gesheng ^{[1
]}

Yang, Lin ^{[3
]}

机构：

[1] Taiyuan Univ Technol, Shanxi Key Lab Mat Strength & Struct Impact, Coll Mech & Vehicle Engn, Inst Appl Mech, Taiyuan 030024, Shanxi, Peoples R China

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[3] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China

来源：

CRYOGENICS | 2021年 / 113卷

关键词：

Grain boundary deformation; Nb3Sn superconducting composite; Grain orientation; Stress concentration;

D O I：

10.1016/j.cryogenics.2020.103210

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We generated a three-dimensional stress map of grains and grain boundaries in uniaxial strained Nb3Sn composite, using a scale-coupled model generated by the polycrystalline finite element method and based on the linear elastic theory of closely packed fiber-reinforced composites. The model takes into account the transfer of stress from a Cu-Sn matrix to a single Nb3Sn filament composed of inner elongated and outer equiaxed grains. Due to differences in grain morphology and orientation, stress inhomogeneity arises first in the filament. The interconnected grain boundary networks in Nb3Sn constrain grain deformation by fostering stress concentration at intersections between multiple grains. The degree of stress concentration can be as high as 2.08. Our model simulations show a random distribution of grain boundary orientations within stress concentration zones and provide detailed information on how and where stress inhomogeneity is likely to produce crack initiation in Nb3Sn.

引用

页数：11