Comparative study of crack growth behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy

doi:10.1016/j.jallcom.2019.02.302

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Comparative study of crack growth behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy
	Wang, Q.1; Ren, J.Q.2; Wu, Y.K.1; Jiang, P.1; Li, J.Q.1; Sun, Z.J.1; Liu, X.T.2
刊名	Journal of Alloys and Compounds
	2019-06-15
卷号	789 页码:249-255
关键词	Aluminum alloys Aluminum metallography Cracks Fatigue crack propagation Lamellar structures Molybdenum alloys Molybdenum metallography Morphology Niobium alloys Niobium metallography Titanium alloys Titanium metallography Zircaloy Zirconium metallography Alpha/beta interface Comparative studies Crack growth behavior Dislocation slip Fully lamellar Low cycle fatigues Secondary alpha Surface damage morphologies
ISSN号	09258388
DOI	10.1016/j.jallcom.2019.02.302
英文摘要	The fatigue crack growth (FCG) behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy were investigated comparably. The FCG rate of bi-lamellar structure is lower than that of fully-lamellar structure, especially at the low stress intensity factor range (ΔK 1/2). The fatigue crack growth path, deformed sub-structure and surface damage morphology were observed by SEM and TEM. For the fully-lamellar structure, because the same orientation of α lamellae and Burgers relationship between α and β lamellas in the α colony, the fatigue cracks often grow along a straight line in the α colony by cutting the β lamellas. For the bi-lamellar structure, because the resistance of secondary α (αs) precipitations in the β lamellas to dislocation slips, the frequency of crack propagation along the α/β interface increases. The fatigue cracks often grow along a zigzag in the α colony, which results in the fatigue crack growth path is more circuitous than that of the fully-lamellar structure in α colonies, and this is the main reason that the FCG rate of bi-lamellar structure is lower than that of fully-lamellar structure. This research has an important engineering significance to improve the low cycle fatigue (LCF) performance of the coarse lamellar structured Ti alloys. © 2019 Elsevier B.V.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000464542700029
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150517]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Luoyang Ship Material Research Institute, Luoyang; 471003, China; 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Wang, Q.,Ren, J.Q.,Wu, Y.K.,et al. Comparative study of crack growth behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy[J]. Journal of Alloys and Compounds,2019,789:249-255.
APA	Wang, Q..,Ren, J.Q..,Wu, Y.K..,Jiang, P..,Li, J.Q..,...&Liu, X.T..(2019).Comparative study of crack growth behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy.Journal of Alloys and Compounds,789,249-255.
MLA	Wang, Q.,et al."Comparative study of crack growth behaviors of fully-lamellar and bi-lamellar Ti-6Al-3Nb-2Zr-1Mo alloy".Journal of Alloys and Compounds 789(2019):249-255.