Effect of interface dislocations on mass flow during high temperature and low stress creep of single crystal Ni-base superalloys

He，Junyang1; Cao，Lijie2,3; Makineni，Surendra Kumar1; Gault，Baptiste1,4; Eggeler，Gunther2

2021-01-15

10.1016/j.scriptamat.2020.09.016

SCRIPTA MATERIALIA   影响因子和分区

1359-6462

In this work, the nanometer-scale mass flow coupled to dislocation processes near the γ/γ′-interface during high temperature and low stress creep of a model Ni-base single crystal superalloy is investigated. In the early creep stages, the dislocation networks in the γ-phase at γ/γ′-interfaces attract γ-stabilizing elements like Cr, Co and in particular Re, resulting in compositional gradients close to the interface. At larger strains, where dislocations frequently cut into the γ′-phase, this local interfacial enrichment in these elements is no longer observed. The cutting dislocations take part of the segregated atoms away, whilst the remaining atoms are released and diffuse back into the γ-channels.

Creep Interfacial dislocation networks Ni-base single crystal superalloys Rafting Segregation

SCI ; EI

英语

通讯

DFG[SFB/TR 103] ; National Key Research and Development Program of China[2017YFB0702901]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000582135200005

PERGAMON-ELSEVIER SCIENCE LTD

20203809194525

Dislocations (crystals) ; Mass transfer ; Nickel alloys ; Phase interfaces ; Superalloys ; Single crystals

Metallurgy and Metallography:531 ; Nickel Alloys:548.2 ; Mass Transfer:641.3 ; Physical Chemistry:801.4 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85090895601

Scopus

1.Max-Planck-Institut für Eisenforschung GmbH,Düsseldorf,40237,Germany
2.Institute for Materials,Ruhr-Universität Bochum,Bochum,44801,Germany
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Materials,Royal School of Mines,Imperial College London,London,Prince Consort Road,SW7 2BP,United Kingdom

He，Junyang,Cao，Lijie,Makineni，Surendra Kumar,et al. Effect of interface dislocations on mass flow during high temperature and low stress creep of single crystal Ni-base superalloys[J]. SCRIPTA MATERIALIA,2021,191:23-28.

He，Junyang,Cao，Lijie,Makineni，Surendra Kumar,Gault，Baptiste,&Eggeler，Gunther.(2021).Effect of interface dislocations on mass flow during high temperature and low stress creep of single crystal Ni-base superalloys.SCRIPTA MATERIALIA,191,23-28.

He，Junyang,et al."Effect of interface dislocations on mass flow during high temperature and low stress creep of single crystal Ni-base superalloys".SCRIPTA MATERIALIA 191(2021):23-28.