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Microstructure and mechanical property evolution of friction stir welded (B4C+Al2O3)/Al composites designed for neutron absorbing materials
Zan YuNing; Wang BeiBei; Zhou YangTao; Jia CunLei; Liu ZhenYu; Wang QuanZhao; Xiao BoLv; Ma ZongYi
2020-07-01
Source PublicationSCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume63Issue:7Pages:1256-1264
Abstract(B4C+Al2O3)/Al composite designed for the dry storage of spent nuclear fuels was fabricated and then subjected to friction stir welding, at a welding speed of 100 mm/min and rotation rates of 400-800 r/min. Sound joints were obtained under all welding parameters; however, significant softening occurred in the nugget zone (NZ) for all the joints. Therefore, all the joints exhibited significantly decreased strength at both room temperature and high temperature compared with the base metal, with the joints fracturing in the NZs. Rotation rate exhibited no obvious effect on the tensile strength of the joints, but led to increased elongation as the result of the broadened NZs. The detailed microstructural examinations indicated that the welding thermo-mechanical effect broke up the near 3D amorphous Al2O3 netlike structure distributed at the Al grain boundaries, caused the coarsening of Al grains, and the agglomeration and crystallization of amorphous Al2O3, thereby resulting in the softening of the NZs and the reduction in the joint strength. Consequently, inhibiting the breakup and crystallization of 3D amorphous Al2O3 netlike structure is the key factor to improve the joint strength of the (B4C+Al2O3)/Al composite.
DOI10.1007/s11431-019-1512-3
WOS IDWOS:000526638800004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82958
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Zan YuNing,Wang BeiBei,Zhou YangTao,et al. Microstructure and mechanical property evolution of friction stir welded (B4C+Al2O3)/Al composites designed for neutron absorbing materials[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2020,63(7):1256-1264.
APA Zan YuNing.,Wang BeiBei.,Zhou YangTao.,Jia CunLei.,Liu ZhenYu.,...&Ma ZongYi.(2020).Microstructure and mechanical property evolution of friction stir welded (B4C+Al2O3)/Al composites designed for neutron absorbing materials.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,63(7),1256-1264.
MLA Zan YuNing,et al."Microstructure and mechanical property evolution of friction stir welded (B4C+Al2O3)/Al composites designed for neutron absorbing materials".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 63.7(2020):1256-1264.
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