Investigation of grain-boundary structure-segregation relationship in an N18 nickel-based superalloy

被引:35
作者
Lemarchand, D [1 ]
Cadel, E [1 ]
Chambreland, S [1 ]
Blavette, D [1 ]
机构
[1] Univ Rouen, Grp Phys Mat, CNRS, UMR 6634, F-76821 Mont St Aignan, France
来源
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 2002年 / 82卷 / 09期
关键词
D O I
10.1080/01418610210125783
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Atom probe tomography and transmission electron microscopy were associated in order to characterize both structurally and chemically different general grain boundaries in a boron-doped N18 nickel-based superalloy. Boron, molybdenum and chromium segregation to the grain boundaries was demonstrated. The distribution of segregated atoms is shown to be nonuniform, both perpendicular to and in the plane of the grain boundaries. The Gibbsian interfacial excess was measured as a function of the misorientation angle and of the degree of twist-tilt character of the grain boundaries, leading to better knowledge of the structure-segregation rate relationship. For boron interfacial excess higher than a critical value, a thin chemically disordered film forms on each side of the grain boundaries. This film could explain the boron-induced mechanical reinforcement of the grain boundaries.
引用
收藏
页码:1651 / 1669
页数:19
相关论文
共 35 条
[11]   RELATION BETWEEN DUCTILITY AND GRAIN-BOUNDARY CHARACTER DISTRIBUTIONS IN NI3AL [J].
CHIBA, A ;
HANADA, S ;
WATANABE, S ;
ABE, T ;
OBANA, T .
ACTA METALLURGICA ET MATERIALIA, 1994, 42 (05) :1733-1738
[12]  
FONTAINE C, 1979, J MICROSC SPECT ELEC, V4, P19
[13]  
FONTAINE C, 1979, J MICROSC SPECT ELEC, V4, P581
[14]   Point defects and the binding energies of boron near defect sites in Ni3Al: A first-principles investigation [J].
Fu, CL ;
Painter, GS .
ACTA MATERIALIA, 1997, 45 (02) :481-488
[15]  
FUHE W, 1996, J PHYS CONDENS MATT, V8, P5527
[16]   DOES A GRAIN-BOUNDARY PHASE EXIST IN NI-24-PERCENT-AL - SUMMARY OF RECENT EXPERIMENTAL WORK [J].
HORTON, JA ;
LIU, CT .
SCRIPTA METALLURGICA ET MATERIALIA, 1990, 24 (07) :1251-1256
[17]   Atom probe analysis of grain boundaries in rapidly-solidified Ni3Al [J].
Horton, J. A. ;
Miller, M. K. .
ACTA METALLURGICA, 1987, 35 (01) :133-141
[18]   Subnanometer scale study of segregation at grain boundaries in an Fe(Si) alloy [J].
Krakauer, BW ;
Seidman, DN .
ACTA MATERIALIA, 1998, 46 (17) :6145-6161
[19]   THE LOCAL COMPOSITIONAL ORDER AT GRAIN-BOUNDARIES IN NI3AL [J].
KUNG, H ;
RASMUSSEN, DR ;
SASS, SL .
SCRIPTA METALLURGICA ET MATERIALIA, 1991, 25 (06) :1277-1282
[20]   SOLUTE-ATOM SEGREGATION - AN OSCILLATORY NI PROFILE AT AN INTERNAL INTERFACE IN PT(NI) [J].
KUO, SM ;
SEKI, A ;
OH, Y ;
SEIDMAN, DN .
PHYSICAL REVIEW LETTERS, 1990, 65 (02) :199-202