Segregation of alloying elements and their effects on the thermodynamic stability and fracture strength of γ-Ni/γ′-Ni3Al interface

doi:10.1007/s10853-020-04854-6

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

	Segregation of alloying elements and their effects on the thermodynamic stability and fracture strength of γ-Ni/γ′-Ni3Al interface
	Ahmed, Fawaz Alnoman Mohammed 1,2,3; Xue, Hong-Tao 1,3; Tang, Fu-Ling 1,3; An, Jun-Peng 1,3; Luo, Ya-Qiao 1,3; Lu, Xue-Feng 1,3; Ren, Jun-Qiang 1,3
刊名	Journal of Materials Science
	2020-09-01
卷号	55 期号:26 页码:12513-12524
关键词	Alloying Alloying elements Calculations Fracture Fracture toughness Nickel alloys Nickel compounds Phase interfaces Single crystals Stability Superalloys Thermodynamic stability Thermodynamics Bonding strength Densities of state First-principles calculation Interfacial fracture Interfacial segregation Micro mechanisms Microstructural stability Single crystal superalloys
ISSN号	00222461
DOI	10.1007/s10853-020-04854-6
英文摘要	Abstract: The γ/γ’ phase interface, being the main plane defect in nickel-based single-crystal superalloys, can have a significant effect on the microstructural stability and mechanical properties of superalloys. To improve the thermodynamic stability and fracture strength of the γ-Ni/γ’-Ni3Al interface and gain insight into the underlying micro-mechanisms, the segregation tendency of 12 alloying elements X at the γ-Ni/γ’-Ni3Al interface and their effects on the interfacial formation and Griffith fracture works were investigated by using first-principles calculations. It is found that all alloying elements X can segregate to the corner-point site of the γ-Ni (001) layer except the element Y. The Re-, Ti-, Mo-, W-, Cr-, Nb-, Ta-, Hf- and Zr-segregated interfaces are more stable than the unalloyed interface due to the presence of pseudogap and lower values of densities of states at the Fermi level. The segregation of Ru, Co, Re, Mo, W, Cr, Nb and Ta strengthens the interfacial fracture strength, which can be mainly attributed to the enhanced bonding strengths of X–Ni bonds formed in these segregated interfaces. The interfacial segregation of Cr, Re, Mo, W, Nb and Ta can not only improve the thermodynamic stability but also enhance the fracture strength of the phase interface. The segregation of Ta and Re is able to improve the thermodynamic stability and fracture strength of the γ-Ni/γ’-Ni3Al interface to the maximum extent, respectively. Graphic abstract: The effect of interfacial segregation of alloying elements on the fracture strength and thermodynamic stability of the γ-Ni/γ’-Ni3Al phase interface and the underlying mechanisms are studied.[Figure not available: see fulltext.]. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
语种	英语
出版者	Springer
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115410]
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材料科学与工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Department of Mathematics and Physics, Faculty of Education, Kassala University, Kassala, Sudan 3.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Ahmed, Fawaz Alnoman Mohammed,Xue, Hong-Tao,Tang, Fu-Ling,et al. Segregation of alloying elements and their effects on the thermodynamic stability and fracture strength of γ-Ni/γ′-Ni3Al interface[J]. Journal of Materials Science,2020,55(26):12513-12524.
APA	Ahmed, Fawaz Alnoman Mohammed.,Xue, Hong-Tao.,Tang, Fu-Ling.,An, Jun-Peng.,Luo, Ya-Qiao.,...&Ren, Jun-Qiang.(2020).Segregation of alloying elements and their effects on the thermodynamic stability and fracture strength of γ-Ni/γ′-Ni3Al interface.Journal of Materials Science,55(26),12513-12524.
MLA	Ahmed, Fawaz Alnoman Mohammed,et al."Segregation of alloying elements and their effects on the thermodynamic stability and fracture strength of γ-Ni/γ′-Ni3Al interface".Journal of Materials Science 55.26(2020):12513-12524.