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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure and mechanical behavior of similar butt-joints of ZK60 and ZK60-1.5RE magnesium alloys produced by linear friction stir welding

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Author(s):
da Silva, Erenilton Pereira [1] ; Buzolin, Ricardo Henrique [2, 3] ; Alfaro, Ulises [4] ; Requena, Guillermo [4, 5] ; Pinto, Haroldo Calvalcanti [6]
Total Authors: 5
Affiliation:
[1] Fed Univ Vales Jequitinhonha & Mucuri UFVJM, Inst Engn Sci & Technol IECT, Janauba, MG - Brazil
[2] Christian Doppler Lab Design High Performance All, Kopernikusgasse 24, A-8010 Graz - Austria
[3] Graz Univ Technol, Inst Mat Sci Joining & Forming, Opernikusgasse 24-1, A-8010 Graz - Austria
[4] German Aerosp Ctr DLR, Inst Mat Res, D-51147 Cologne - Germany
[5] Rhein Westfal TH Aachen, Metall Struct & Mat Syst Aerosp Engn, D-52062 Aachen - Germany
[6] Univ Sao Paulo, Sao Carlos Sch Engn EESC, Dept Mat Engn, BR-13563120 Sao Carlos, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: JOURNAL OF MAGNESIUM AND ALLOYS; v. 9, n. 5, p. 1782-1796, SEP 15 2021.
Web of Science Citations: 0
Abstract

The microstructure and mechanical properties of butt-joints produced by linear friction stir welding of similar plates of as-cast ZK60 and modified ZK60 with 1.5 wt.% RE (ZK60-1.5RE) are investigated. The thermomechanical affected zone is investigated in both advancing and retrieving sides, and the microstructure is compared to the base metal and the stirred zone. Electron backscattered diffraction measurements provide the average microstructural features of the transformed microstructure. The mechanical properties are assessed using hardness, tensile testing, and surface residual stress measured using X-ray diffraction. Higher torque and heat input are obtained for the ZK60-1.5RE compared to the ZK60. The thermomechanical affected zone is notably larger for the ZK60 compared to the ZK60-1.5RE. A gradient microstructure is formed in thermomechanical affected zones where deformed grains are progressively more recrystallised towards the stirred zone. There is no visible interface between the thermomechanical affected zone and the stirred zone. A fine and partially recrystallised microstructure is formed in the stirred zone. The retrieving side of the ZK60-1.5RE has a slightly more refined microstructure compared to the other investigated zones. Anisotropy measured with increment in the maximum intensity of the (0001) increases towards to stirred zone. The formed microstructure is correlated with the role of twinning, recovery, static, and dynamic recrystallisation that can occur during friction stir welding. Twinning and grains with large misorientation spread are more pronounced in the thermomechanical affected zone and regions towards the base metal. Sharp low angle grain boundaries are observed towards the stirred zone. From refined recrystallised grains decorating the grain in the thermomechanical affected zone, a mosaic-like of low and high angle grain boundaries are observed in the stirred zone. The joints have comparable surface residual stresses. The friction stir welding improved the ductility and strength of the as-cast ZK60-1.5RE alloy since the tensile samples fractured in the BM. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. (AU)

FAPESP's process: 10/11391-2 - Friction stir welding of thixocast high performance magnesium alloys
Grantee:Haroldo Cavalcanti Pinto
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 11/09324-8 - Friction stir welding of thixocast high performance magnesium alloys
Grantee:Erenilton Pereira da Silva
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)