Investigation of Fe-rich fragments in aluminum-steel friction stir-welds via simultaneous Transmission Kikuchi Diffraction and EDS

被引：64
作者：
Abbasi, Majid [1 ]
Dehghani, Morteza [2 ,3 ]
Guim, Hwan-Uk [4 ]
Kim, Dong-Ik [1 ]
机构：
[1] Korea Inst Sci & Technol, High Temp Energy Mat Res Ctr, Seoul 136791, South Korea
[2] Univ Tehran, Sch Met & Mat Engn, Tehran, Iran
[3] Azad Univ, Sci & Res Branch, POB 14515-775, Tehran, Iran
[4] Korea Basic Sci Inst, Nanobio Electron Microscopy Res Team, Daejeon 305333, South Korea
来源：
ACTA MATERIALIA | 2016年 / 117卷
关键词：
Friction stir welding (FSW); Transmission Kikuchi diffraction (TKD); Transmission electron backscattered diffraction (t-EBSD); Al-Fe intermetallics; Nano-twinning; Texture; INCOHERENT TWIN BOUNDARIES; AL-MG ALLOY; MECHANICAL-PROPERTIES; INTERFACIAL REACTION; INTERMETALLIC COMPOUND; PROCESS PARAMETERS; DISSIMILAR METALS; CARBON-STEEL; SOLID IRON; MICROSTRUCTURE;
D O I：
10.1016/j.actamat.2016.06.064
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An attempt has been made to investigate Fe-rich fragments and surrounding intermetallic compounds in aluminum-steel friction stir welds using conventional EBSD + EDS as well as advanced Transmission Kikuchi Diffraction (TKD). Results indicate that the fragments are covered by a layer of orthorhombic Al5Fe2. This layer is surrounded by a mixed region composed of sub-micrometer Al3Fe crystals in a matrix of Al nano grains. Employing high beam current TKD on electron-transparent samples enables investigation of sub-micrometer grains in the mixed region with a higher spatial resolution than conventional EBSD. As a result, nano-twinning in Al in the mixed region has been observed. Microstructural and texture results imply that Fe-rich fragments travel through the Al matrix under extreme shear forces, severely refining Al grains, and inducing nano-twinning. Due to extreme shear forces and Fe outward diffusion, fine steel fragments dissolve in the surroundings leading to the nucleation of nano Al3Fe crystals particularly along Al grain boundaries. Al3Fe crystals consume the Al matrix as they grow in size and fraction. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：262 / 269
页数：8
相关论文
共 76 条
[1]  
Abbasi M., 2012, 9 INT C TRENDS WELD
[2]   Application of Transmitted Kikuchi Diffraction in Studying Nano-oxide and Ultrafine Metallic Grains [J].
Abbasi, Majid ;
Kim, Dong-Ik ;
Guim, Hwan-Uk ;
Hosseini, Morteza ;
Danesh-Manesh, Habib ;
Abbasi, Mehrdad .
ACS NANO, 2015, 9 (11) :10991-11002
[3]   Transformation and Deformation Texture Study in Friction Stir Processed API X80 Pipeline Steel [J].
Abbasi, Majid ;
Nelson, Tracy W. ;
Sorensen, Carl D. .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2012, 43A (13) :4940-4946
[4]   Intermetallic FexAly-phases in a steel/Al-alloy fusion weld [J].
Agudo, Leonardo ;
Eyidi, Dominique ;
Schmaranzer, Christian H. ;
Arenholz, Enno ;
Jank, Nasrin ;
Bruckner, Juergen ;
Pyzalla, Anke R. .
JOURNAL OF MATERIALS SCIENCE, 2007, 42 (12) :4205-4214
[5]   Twinning via the motion of incoherent twin boundaries nucleated at grain boundaries in a nanocrystalline Cu alloy [J].
An, X. H. ;
Song, M. ;
Huang, Y. ;
Liao, X. Z. ;
Ringer, S. P. ;
Langdon, T. G. ;
Zhu, Y. T. .
SCRIPTA MATERIALIA, 2014, 72-73 :35-38
[6]  
Ansara A., 1998, THERMOCHEMICAL DATAB, V2, P34
[7]  
Armbrüster M, 2012, NAT MATER, V11, P690, DOI [10.1038/NMAT3347, 10.1038/nmat3347]
[8]  
Baker H, 1993, ASM HDB, V3
[9]   Kinetic interactions between solid iron and molten aluminium [J].
Bouayad, A ;
Gerometta, C ;
Belkebir, A ;
Ambari, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 363 (1-2) :53-61
[10]   Intermetallic compound layer growth between solid iron and molten aluminium [J].
Bouche, K ;
Barbier, F ;
Coulet, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 249 (1-2) :167-175
12345678