Grain boundary segregation in binary nickel-bismuth alloy

被引：28
作者：
Chellali, M. R. [1 ,2 ,3 ]
Zheng, L. [3 ,4 ]
Schlesiger, R. [3 ]
Bakhti, B. [5 ]
Hamou, A. [2 ]
Janovec, J. [1 ]
Schmitz, G. [6 ]
机构：
[1] Slovak Univ Technol Bratislava, Fac Mat Sci & Technol Trnava, Trnava 91724, Slovakia
[2] Univ Oran 1, Lab Environm Sci & Mat Studies, Ahmed Benbella, Oran, Algeria
[3] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany
[4] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[5] Univ Osnabruck, Fachbereich Phys, D-49076 Osnabruck, Germany
[6] Univ Stuttgart, Inst Mat Sci, D-70569 Stuttgart, Germany
来源：
ACTA MATERIALIA | 2016年 / 103卷
基金：
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词：
Nickel; Bismuth; Grain-boundary segregation; Embrittlement; Atom probe tomography; Nanocrystalline alloys; NI-BASE SUPERALLOY; INTERMEDIATE TEMPERATURE EMBRITTLEMENT; INTERGRANULAR FRACTURE; TRIPLE JUNCTION; LIQUID BISMUTH; SULFUR SYSTEM; HOT DUCTILITY; CU(BI) ALLOYS; MG ALLOY; BI;
D O I：
10.1016/j.actamat.2015.11.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Grain boundary segregation and segregation kinetics are investigated by means of atom probe tomography in a binary Nanocrystalline nickel-bismuth alloy. Gibbsian excess and width of segregation layers at grain boundary are quantitatively determined. If segregation is approximated by McLean kinetics, remarkably fast volume transport of bismuth is derived. However, details of the segregation kinetics are in significant contrast to the McLean model. Additional influence of attractive Bismuth interaction is indicated. The experimentally demonstrated clear segregation tendency suggests that reported embrittlement of Ni-Bi alloys is due to significant grain boundary segregation of Bi. Diffusivity of Bi in nanocrystalline Ni and segregation amplitude were found to be D-B (2.16 +/- 0.48)x 10-(21) m(2)s-(1), and 17 respectively. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：754 / 760
页数：7
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