Effects of Cr on twinning in Ni-based superalloys

被引：5
作者：
Borovikov, Valery V. [1 ]
Mendelev, Mikhail I. [2 ]
Smith, Timothy M. [3 ]
Lawson, John W. [2 ]
机构：
[1] KBR Inc, Intelligent Syst Div, NASA Ames Res Ctr, Moffett Field, CA 94035 USA
[2] NASA Ames Res Ctr, Intelligent Syst Div, Moffett Field, CA 94035 USA
[3] NASA Glenn Res Ctr, Cleveland, OH 44135 USA
来源：
SCRIPTA MATERIALIA | 2024年 / 250卷
关键词：
Ni-based superalloys; Microtwinning; High temperature deformation creep; Effects of Cr; Atomistic modeling; PHASE-TRANSFORMATION; CREEP STRENGTH; PLANAR FAULTS; MECHANISM; SEGREGATION; TEMPERATURE; ELEMENTS; STRESS;
D O I：
10.1016/j.scriptamat.2024.116199
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Micro-twinning is the major creep deformation mechanism in Ni-based superalloys at temperatures above 700 degrees C. Recent experiments suggest that superlattice stacking faults in gamma ' phase may serve as precursors for twin formation. Segregation of alloy elements to these precursors may have a significant effect on the formation and extension of micro-twins. Using atomistic modeling, we investigated and explained the effects of Cr on these processes. Our results indicate that depending on the site preference of Cr in Ni3Al gamma ' phase, two drastically different deformation behaviors can be expected. Occupying Al sites, Cr significantly accelerates deformation twinning. Cr on Ni sites, on the other hand, suppresses twin growth and slows down the high temperature deformation creep. These results help to rationalize the experimentally observed puzzling effects of alloy composition on creep resistance.
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页数：6
相关论文
共 32 条
[1]  
[Anonymous], About Us
[2]   An Atom Probe Tomography study of site preference and partitioning in a nickel-based superalloy [J].
Bagot, P. A. J. ;
Silk, O. B. W. ;
Douglas, J. O. ;
Pedrazzini, S. ;
Crudden, Dj. ;
Martin, T. L. ;
Hardy, M. C. ;
Moody, M. P. ;
Reed, R. C. .
ACTA MATERIALIA, 2017, 125 :156-165
[3]   Deformation Mechanisms Rationalisation to Design for Creep Resistance in Polycrystalline Ni-Based Superalloys [J].
Barba, D. ;
Egan, A. ;
Utada, S. ;
Gong, Y. ;
Tang, Y. T. ;
Mazanova, V. ;
Mills, M. J. ;
Reed, R. C. .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2023, 54 (05) :1886-1901
[4]   On the microtwinning mechanism in a single crystal superalloy [J].
Barba, D. ;
Alabort, E. ;
Pedrazzini, S. ;
Collins, D. M. ;
Wilkinson, A. J. ;
Bagot, P. A. J. ;
Moody, M. P. ;
Atkinson, C. ;
Jerusalem, A. ;
Reed, R. C. .
ACTA MATERIALIA, 2017, 135 :314-329
[5]   Effect of Nb solutes on the Kolbe mechanism for microtwinning in Ni-based superalloys [J].
Borovikov, Valery V. ;
Mendelev, Mikhail I. ;
Zarkevich, Nikolai A. ;
Smith, Timothy M. ;
Lawson, John W. .
INTERNATIONAL JOURNAL OF PLASTICITY, 2024, 178
[6]   Molecular dynamics simulation of twin nucleation and growth in Ni-based superalloys [J].
Borovikov, Valery V. ;
Mendelev, Mikhail I. ;
Smith, Timothy M. ;
Lawson, John W. .
INTERNATIONAL JOURNAL OF PLASTICITY, 2023, 166
[7]   Modeling antiphase boundary energies of Ni3Al-based alloys using automated density functional theory and machine learning [J].
Chen, Enze ;
Tamm, Artur ;
Wang, Tao ;
Epler, Mario E. ;
Asta, Mark ;
Frolov, Timofey .
NPJ COMPUTATIONAL MATERIALS, 2022, 8 (01)
[8]   SHEARING OF GAMMA' PRECIPITATES BY SINGLE A/2 (110) MATRIX DISLOCATIONS IN A GAMMA/GAMMA' NI-BASED SUPERALLOY [J].
CONDAT, M ;
DECAMPS, B .
SCRIPTA METALLURGICA, 1987, 21 (05) :607-612
[9]   Solute diffusion of Al-substituting elements in Ni3Al and the diffusion mechanism of the minority component [J].
Divinski, SV ;
Frank, S ;
Sodervall, U ;
Herzig, C .
ACTA MATERIALIA, 1998, 46 (12) :4369-4380
[10]   Quantitative prediction of Suzuki segregation at stacking faults of the γ' phase in Ni-base superalloys [J].
Feng, Longsheng ;
Rao, You ;
Ghazisaeidi, Maryam ;
Mills, Michael J. ;
Wang, Yunzhi .
ACTA MATERIALIA, 2020, 200 :223-235
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