Strain localisation and failure at twin-boundary complexions in nickel-based superalloys

doi:10.1038/s41467-020-18641-z

	Strain localisation and failure at twin-boundary complexions in nickel-based superalloys
	Zhang, Zhenbo1,2 ; Yang, Zhibiao 3,4; Lu, Song 3; Harte, Allan 1; Morana, Roberto 5; Preuss, Michael 1
	2020-09-29
发表期刊	NATURE COMMUNICATIONS
ISSN	2041-1723
卷号	11 期号:1
DOI	10.1038/s41467-020-18641-z
摘要	Twin boundaries (TBs) in Ni-based superalloys are vulnerable sites for failure in demanding environments, and a current lack of mechanistic understanding hampers the reliable lifetime prediction and performance optimisation of these alloys. Here we report the discovery of an unexpected gamma '' precipitation mechanism at TBs that takes the responsibility for alloy failure in demanding environments. Using multiscale microstructural and mechanical characterisations (from millimetre down to atomic level) and DFT calculations, we demonstrate that abnormal gamma '' precipitation along TBs accounts for the premature dislocation activities and pronounced strain localisation associated with TBs during mechanical loading, which serves as a precursor for crack initiation. We clarify the physical origin of the TBs-related cracking at the atomic level of gamma ''-strengthened Ni-based superalloys in a hydrogen containing environment, and provide practical methods to mitigate the adverse effect of TBs on the performance of these alloys.
收录类别	SCI ; SCIE
语种	英语
资助项目	EPSRC[EP/I005420/1]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000577262800001
出版者	NATURE RESEARCH
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/123524
专题	创意与艺术学院_PI研究组(P)_张振波组
通讯作者	Zhang, Zhenbo; Preuss, Michael
作者单位	1.Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England; 2.ShanghaiTech Univ, Sch Creat & Arts, Ctr Adaptat Syst Engn, Shanghai 201210, Peoples R China; 3.Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden; 4.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China; 5.BP Explorat Operating Co Ltd, Chertsey Rd, Sunbury On Thames TW16 7LN, Middx, England
第一作者单位	创意与艺术学院
通讯作者单位	创意与艺术学院
推荐引用方式 GB/T 7714	Zhang, Zhenbo,Yang, Zhibiao,Lu, Song,et al. Strain localisation and failure at twin-boundary complexions in nickel-based superalloys[J]. NATURE COMMUNICATIONS,2020,11(1).
APA	Zhang, Zhenbo,Yang, Zhibiao,Lu, Song,Harte, Allan,Morana, Roberto,&Preuss, Michael.(2020).Strain localisation and failure at twin-boundary complexions in nickel-based superalloys.NATURE COMMUNICATIONS,11(1).
MLA	Zhang, Zhenbo,et al."Strain localisation and failure at twin-boundary complexions in nickel-based superalloys".NATURE COMMUNICATIONS 11.1(2020).