The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer

doi:10.1016/j.matchar.2021.111262

	The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer
	Zhang, Penglin 2; Cheng, Qianqian 2; Yi, Gewen 3; Wang, Wenzhen 3; Liu, Yanyan 1
刊名	MATERIALS CHARACTERIZATION
	2021-08
卷号	178
关键词	Titanium alloy Laser gas nitriding Microstructure Fracture toughness Hardness and elastic modulus
ISSN号	1044-5803
DOI	10.1016/j.matchar.2021.111262
英文摘要	A fiber laser assisted the preparation of a nitride layer on the Ti6Al4V surface in a pure nitrogen atmosphere. Through SEM, XRD, and XPS analyses, the nitride layer is found to be mainly composed of dendritic TiN phase and an interdendritic alpha '-Ti phase. Not only the true crystal structure of the two main phases (TiN and alpha '-Ti) were directly characterized using TEM, but also the mechanical properties were tested by micro-indentation and nanoindentation methods for the first time.It is found that the nano-hardness of the TiN phase is 2609 HV, and the elastic modulus is 208 GPa. During the TiN dendritic fracture process, the primary dendrites undergo near ductile fracture along the growth direction of the secondary dendrites, and microcracks, bifurcations, deflection, etc. occur to form a crack-toughening mechanism. The nano-hardness of alpha '-Ti is 632 HV, and the elastic modulus is 142.8 GPa. The entanglement of two sets of parallel dislocations in alpha '-Ti crystals forms subgrain boundaries, which exert a positive influence on work hardening and fine-grain strengthening.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000678041500001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148976]
专题	材料科学与工程学院
作者单位	1.Heze Med Coll, Heze 274000, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 3.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;
推荐引用方式 GB/T 7714	Zhang, Penglin,Cheng, Qianqian,Yi, Gewen,et al. The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer[J]. MATERIALS CHARACTERIZATION,2021,178.
APA	Zhang, Penglin,Cheng, Qianqian,Yi, Gewen,Wang, Wenzhen,&Liu, Yanyan.(2021).The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer.MATERIALS CHARACTERIZATION,178.
MLA	Zhang, Penglin,et al."The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer".MATERIALS CHARACTERIZATION 178(2021).