Microstructure and mechanical property evolution of friction stir welded (B4C+Al2O3)/Al composites designed for neutron absorbing materials

doi:10.1007/s11431-019-1512-3

IMR OpenIR

	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 Publication	SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume	63 Issue:7 Pages: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.
DOI	10.1007/s11431-019-1512-3
WOS ID	WOS:000526638800004
Citation statistics
Document Type	期刊论文
Identifier	http://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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