Cold spray additive manufacturing: A viable strategy to fabricate thick B4C/Al composite coatings for neutron shielding applications

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	Cold spray additive manufacturing: A viable strategy to fabricate thick B4C/Al composite coatings for neutron shielding applications
	Tariq, NH; Gyansah, L; Wang, JQ; Qiu, X; Feng, B; Siddique, MT; Xiong, TY; Xiong, TY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	SURFACE & COATINGS TECHNOLOGY
	2018-04-15
卷号	339 页码:224-236
关键词	Metal-matrix Composite Mechanical-properties Heat-treatment Microstructure Performance Design Aluminum Deposit Alloy
ISSN号	0257-8972
英文摘要	This paper presents a design flexible, innovative strategy that can be used for the development, restoration and/or repairing of neutron shielding products in the near future. Cold spray additive manufacturing technique was employed to deposit a 6 mm thick neutron shielding B4C/Al composite coating on a 6061-T6 cylindrical substrate. Microstructure, mechanical behavior and neutron shielding performance of the free standing coating were investigated at different heat treatment conditions in the order: 200, 300, 400 and 500 degrees C. Microstructure evolutions were characterized using scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), laser confocal scanning microscopy (LSM), X-ray diffraction (XRD) techniques, while mechanical properties were investigated via tensile and hardness tests. It was revealed that due to the presence of large amount of inter-splats' defects and intensive cold working, the as-deposited coating exhibited poor strength and fractured in a brittle manner. Moreover, as the heat treatment temperature was increased, the coating gradually recovered the ductility and gained strength due to progressive bonding/healing of inter-splat boundaries through recovery and recrystallization mechanisms. The coating heat-treated at 500 degrees C displayed maximum ductility (1.4%) and strength (60 MPa) with minimum porosity level of 1.9%. Neutron shielding results showed attenuation of thermal neutrons with increasing sample thickness. Neutron shielding results also displayed a slight improvement in the neutron shielding performance of the sample heat-treated at 500 degrees C.; This paper presents a design flexible, innovative strategy that can be used for the development, restoration and/or repairing of neutron shielding products in the near future. Cold spray additive manufacturing technique was employed to deposit a 6 mm thick neutron shielding B4C/Al composite coating on a 6061-T6 cylindrical substrate. Microstructure, mechanical behavior and neutron shielding performance of the free standing coating were investigated at different heat treatment conditions in the order: 200, 300, 400 and 500 degrees C. Microstructure evolutions were characterized using scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), laser confocal scanning microscopy (LSM), X-ray diffraction (XRD) techniques, while mechanical properties were investigated via tensile and hardness tests. It was revealed that due to the presence of large amount of inter-splats' defects and intensive cold working, the as-deposited coating exhibited poor strength and fractured in a brittle manner. Moreover, as the heat treatment temperature was increased, the coating gradually recovered the ductility and gained strength due to progressive bonding/healing of inter-splat boundaries through recovery and recrystallization mechanisms. The coating heat-treated at 500 degrees C displayed maximum ductility (1.4%) and strength (60 MPa) with minimum porosity level of 1.9%. Neutron shielding results showed attenuation of thermal neutrons with increasing sample thickness. Neutron shielding results also displayed a slight improvement in the neutron shielding performance of the sample heat-treated at 500 degrees C.
学科主题	Materials Science, Coatings & Films ; Physics, Applied
语种	英语
资助机构	National Natural Science Foundation of China [51671205]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79361]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, JQ; Xiong, TY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Tariq, NH,Gyansah, L,Wang, JQ,et al. Cold spray additive manufacturing: A viable strategy to fabricate thick B4C/Al composite coatings for neutron shielding applications[J]. SURFACE & COATINGS TECHNOLOGY,2018,339:224-236.
APA	Tariq, NH.,Gyansah, L.,Wang, JQ.,Qiu, X.,Feng, B.,...&Xiong, TY .(2018).Cold spray additive manufacturing: A viable strategy to fabricate thick B4C/Al composite coatings for neutron shielding applications.SURFACE & COATINGS TECHNOLOGY,339,224-236.
MLA	Tariq, NH,et al."Cold spray additive manufacturing: A viable strategy to fabricate thick B4C/Al composite coatings for neutron shielding applications".SURFACE & COATINGS TECHNOLOGY 339(2018):224-236.