Electro-healing cracks in nickel

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	Electro-healing cracks in nickel
	X. G. Zheng; Y. N. Shi; K. Lu
	2013
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	561 页码:52-59
摘要	Healing cracks in metallic materials is challenging due to limited atomic mobility in solid state around ambient temperature. In this paper, we developed a novel crack-healing approach by means of an electrochemical process in which metallic ions in electrolyte are used as a healing agent. Pure Ni sheets with a through-thickness crack were taken as an example. Cracks with sizes in the micrometer range or larger are successfully healed by electro-healing. The electro-healing process starts with the vertical epitaxial growth of healing, crystals from the original crack surfaces followed by lateral growth of healing crystals that bond with each other at atomistic level. Tensile tests exhibited that the healed samples have a comparable tensile strength as the virgin sample and some tensile ductility can be achieved for the sample of 100 mu m thick. Post-fracture analysis indicated that part of the crack propagated along the substrate instead of healing crystals. The healing efficiency, ranging from 96% to 33% with an increasing sample thickness, is related to the fraction of fully-healed region and the strength difference between the substrate and the healing crystals. (C) 2012 Elsevier B.V. All rights reserved.
部门归属	[zheng, x. g. ; shi, y. -n. ; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; shi, yn (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; yinongshi@imr.ac.cn
关键词	Metallic Materials Crack Healing Electro-healing Interfaces Healing Efficiency Austenitic Stainless-steel Creep Cavitation Alloys Damage
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71732
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. G. Zheng,Y. N. Shi,K. Lu. Electro-healing cracks in nickel[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2013,561:52-59.
APA	X. G. Zheng,Y. N. Shi,&K. Lu.(2013).Electro-healing cracks in nickel.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,561,52-59.
MLA	X. G. Zheng,et al."Electro-healing cracks in nickel".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 561(2013):52-59.