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PHASE-FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE gamma PHASE IN Al-Ag ALLOY
Gao Yingjun1,2,3; Luo Zhirong1,2; Zhang Shaoyi1; Huang Chuanggao1
Corresponding AuthorGao Yingjun(gaoyj@gxu.edu.cn)
2010-12-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume46Issue:12Pages:1473-1480
AbstractInteractions between different precipitation products during phase decomposition for different alloys have been observed. Spinodal decomposition and intragranular precipitation are the two well-know mechanisms for explaining phase decomposition, both of which interaction mechanisms have been investigated experimentally in recently. A local free energy density function depending on aging temperature and composition has been proposed to describe the interaction between the Ag solute field and gamma precipitates in phase-field simulation of spinodal decomposition in Al-Ag alloy. The evolution of spinodal decomposition in Al-Ag alloy with 4.2%Ag and 22%Ag has been simulated by the phase-field method using this function to represent numerically the precipitated Guinier-Preston zones (GPZ) around a gamma phase. The simulated results show that PFZ around a precipitated phase is an elliptical and its width is about two times the width of gamma phase. In the region far from PFZ, a pattern of Ag solute field appears due to spinodal decomposition. When Ag-depleted zones are relatively far apart with each other, spinodal decomposition is strongly affected by them. The formation of PFZ resulting from spinodal decomposition has been initiated in the central region of the supersaturated a matrix before the modulation effect of Ag solute field at edge reachs here. It is found that two or three Ag-rich bands appear around the PFZ. During aging, Ag diffuses from not only the alpha matrix but also the edge of Ag-depleted zones, where an accumulation of Ag occurs. After long time aging, many droplet-like Ag solute bands are formed near PFZ around gamma phase. These simulated results are in better agreement with the experimental results.
KeywordAl-Ag alloy spinodal decomposition phase-field simulation precipitation
Funding OrganizationNational Natural Science Foundation of China
DOI10.3724/SP.J.1037.2010.00216
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[50661001] ; National Natural Science Foundation of China[50061001]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000286034800001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/102265
Collection中国科学院金属研究所
Corresponding AuthorGao Yingjun
Affiliation1.Guangxi Univ, Coll Phys Sci & Engn, Nanning 530004, Peoples R China
2.Guangxi Univ, Key Lab Disaster Prevent & Struct Safety, Nanning 530004, Peoples R China
3.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Gao Yingjun,Luo Zhirong,Zhang Shaoyi,et al. PHASE-FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE gamma PHASE IN Al-Ag ALLOY[J]. ACTA METALLURGICA SINICA,2010,46(12):1473-1480.
APA Gao Yingjun,Luo Zhirong,Zhang Shaoyi,&Huang Chuanggao.(2010).PHASE-FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE gamma PHASE IN Al-Ag ALLOY.ACTA METALLURGICA SINICA,46(12),1473-1480.
MLA Gao Yingjun,et al."PHASE-FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE gamma PHASE IN Al-Ag ALLOY".ACTA METALLURGICA SINICA 46.12(2010):1473-1480.
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