Multi-phase-field simulation of D019-? transformation in Co-Al-W superalloy with L12-?' + fcc-? phases

被引：1
作者：
Li, Yongsheng [1 ,2 ]
Long, Hongli [1 ,2 ]
Zhang, Xiaoyuan [1 ,2 ]
Shi, Shujing [1 ,2 ]
Sang, Peng [1 ,2 ]
Zhang, Zan [1 ,2 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
[2] MIIT Key Lab Adv Met & Intermet Mat Technol, Nanjing 210094, Peoples R China
来源：
COMPUTATIONAL MATERIALS SCIENCE | 2023年 / 230卷
基金：
中国国家自然科学基金;
关键词：
Co -based superalloy; Phase transformation; Phase; -field; D019-Co3W; GAMMA-PHASE; EVOLUTION; STABILITY; PRECIPITATION; MICROSTRUCTURE; DEFORMATION; KINETICS; MODEL; TA; TI;
D O I：
10.1016/j.commatsci.2023.112445
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The L12-& gamma;& PRIME;-Co3(Al, W) phase in Co-based superalloys substantially improves the creep properties and oxidation resistance. However, the cubic & gamma;& PRIME; phase in Co-Al-W superalloy becomes unstable at high temperature and transforms into the strip-shaped D019-& chi;-Co3W phase with prolonged aging. The transformation mechanism and evolution kinetics of the & chi; phase in Co-8.25Al-10 W (at.%) superalloy with & gamma; + & gamma;' phases are studied by establishing the multi-phase-filed model with the sublattice free energies of fcc-L12 and hcp-D019 phases. Aged at 1173 K, the & gamma;' phase transforms into & chi; phase through in-situ transformation by superlattice intrinsic stacking faults (SISF), the strip-shaped & chi; phase grows in direction of [0001]& chi; [111]& gamma; and forms an angle of 60 degrees with the alignment orientations [100]& gamma;& PRIME; and [010]& gamma;& PRIME; of & gamma;& PRIME; phase. The strip-shaped & chi; phase causes the stress concentration and the large difference of diffusion potential, promoting the continuous transformation of the & gamma;' phase to & chi; phase, the Ostwald ripening of & gamma;& PRIME; phase happens simultaneously at the regions with low diffusion potential. The chemical potential shows a dominated effect on driving the transformation of & gamma;& PRIME; phase to & chi; phase. The study reveals the mechanisms and driving force of multi-phase transformation from fcc to D019 structure with the stress change in these phases.
引用
收藏
页数：9
相关论文
共 36 条
[1]   The effect of long-term thermal exposures on the microstructure and properties of CMSX-10 single crystal Ni-base superalloys [J].
Acharya, A ;
Fuchs, GE .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 381 (1-2) :143-153
[2]   Identification of planar defects in D019 phases using high-resolution transmission electron microscopy [J].
Carvalho, P ;
Kooi, BJ ;
De Hosson, JTM .
PHILOSOPHICAL MAGAZINE LETTERS, 2001, 81 (10) :697-707
[3]   On the fcc→D019 transformation in Co-W alloys [J].
Carvalho, PA ;
Bronsveld, PM ;
Kooi, BJ ;
De Hosson, JTM .
ACTA MATERIALIA, 2002, 50 (18) :4511-4526
[4]   Experimental and phenomenological investigations of diffusion in Co-Al-W alloys [J].
Chang, Hui ;
Xu, Guanglong ;
Lu, Xiao-Gang ;
Zhou, Lian ;
Ishida, Kiyohito ;
Cui, Yuwen .
SCRIPTA MATERIALIA, 2015, 106 :13-16
[5]   Applications of semi-implicit Fourier-spectral method to phase field equations [J].
Chen, LQ ;
Shen, J .
COMPUTER PHYSICS COMMUNICATIONS, 1998, 108 (2-3) :147-158
[6]   Effects of Cr content on compositional evolution and precipitation kinetics of γ' phase in Ni-Al-Cr alloy: 2D phase-field simulation [J].
Jin, Shengshun ;
Li, Yongsheng ;
Shi, Shujing ;
Yan, Zhengwei ;
Chen, Shi .
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 2020, 9 (04) :7499-7507
[7]   Predicting the morphologies of γ′ precipitates in cobalt-based superalloys [J].
Jokisaari, A. M. ;
Naghavi, S. S. ;
Wolverton, C. ;
Voorhees, P. W. ;
Heinonen, O. G. .
ACTA MATERIALIA, 2017, 141 :273-284
[8]  
Khachaturyan A G., 1983, Theory of Structural Transformations in Solids
[9]   MODELING AND NUMERICAL SIMULATIONS OF DENDRITIC CRYSTAL-GROWTH [J].
KOBAYASHI, R .
PHYSICA D, 1993, 63 (3-4) :410-423
[10]   The effects of alloying elements (Ta, Hf) on the thermodynamic stability of γ′-Co3(Al,W) phase [J].
Kobayashi, Satoru ;
Tsukamoto, Yuki ;
Takasugi, Takayuki .
INTERMETALLICS, 2012, 31 :94-98
1234