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Title: Microstructure Evolution and Mechanical Property Characterization of 6063 Aluminum Alloy Tubes Processed with Friction Stir Back Extrusion

Abstract

Friction stir back extrusion (FSBE) is a technique for lightweight metal extrusion. The frictional heat and severe plastic deformation of the process generate an equiaxed refined grain structure because of dynamic recrystallization. Previous studies proved that the fabrication of tube and wire structures is feasible. In this work, hollow cylindrical billets of 6063-T6 aluminum alloy were used as starting material. A relatively low extrusion ratio allows for a temperature and deformation gradient through the tube wall thickness to elucidate the effect of heat and temperature on the microstructure evolution during FSBE. The force and temperature were recorded during the processes. The microstructures of the extruded tubes were characterized using an optical microscope, energy-dispersive x-ray spectroscopy, electron backscatter diffraction, and hardness testing. The process reduced the grain size from 58.2 μm to 20.6 μm at the inner wall. The microhardness of the alloy was reduced from 100 to 60–75 HV because of the process thermal cycle.

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1619661
Alternate Identifier(s):
OSTI ID: 1684664
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Volume: 71 Journal Issue: 12; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Suhong, Frederick, Alan, Wang, Yiyu, Eller, Mike, McGinn, Paul, Hu, Anming, and Feng, Zhili. Microstructure Evolution and Mechanical Property Characterization of 6063 Aluminum Alloy Tubes Processed with Friction Stir Back Extrusion. United States: N. p., 2019. Web. doi:10.1007/s11837-019-03852-7.
Zhang, Suhong, Frederick, Alan, Wang, Yiyu, Eller, Mike, McGinn, Paul, Hu, Anming, & Feng, Zhili. Microstructure Evolution and Mechanical Property Characterization of 6063 Aluminum Alloy Tubes Processed with Friction Stir Back Extrusion. United States. doi:https://doi.org/10.1007/s11837-019-03852-7
Zhang, Suhong, Frederick, Alan, Wang, Yiyu, Eller, Mike, McGinn, Paul, Hu, Anming, and Feng, Zhili. Tue . "Microstructure Evolution and Mechanical Property Characterization of 6063 Aluminum Alloy Tubes Processed with Friction Stir Back Extrusion". United States. doi:https://doi.org/10.1007/s11837-019-03852-7.
@article{osti_1619661,
title = {Microstructure Evolution and Mechanical Property Characterization of 6063 Aluminum Alloy Tubes Processed with Friction Stir Back Extrusion},
author = {Zhang, Suhong and Frederick, Alan and Wang, Yiyu and Eller, Mike and McGinn, Paul and Hu, Anming and Feng, Zhili},
abstractNote = {Friction stir back extrusion (FSBE) is a technique for lightweight metal extrusion. The frictional heat and severe plastic deformation of the process generate an equiaxed refined grain structure because of dynamic recrystallization. Previous studies proved that the fabrication of tube and wire structures is feasible. In this work, hollow cylindrical billets of 6063-T6 aluminum alloy were used as starting material. A relatively low extrusion ratio allows for a temperature and deformation gradient through the tube wall thickness to elucidate the effect of heat and temperature on the microstructure evolution during FSBE. The force and temperature were recorded during the processes. The microstructures of the extruded tubes were characterized using an optical microscope, energy-dispersive x-ray spectroscopy, electron backscatter diffraction, and hardness testing. The process reduced the grain size from 58.2 μm to 20.6 μm at the inner wall. The microhardness of the alloy was reduced from 100 to 60–75 HV because of the process thermal cycle.},
doi = {10.1007/s11837-019-03852-7},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 12,
volume = 71,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1007/s11837-019-03852-7

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: (a) A schematic drawing of the tools in the FSBE experimental setup in this study. The aluminum tube (orange) extrudes in the direction opposite to the tool plunging direction (backward extrusion), as marked by the arrow labeled ‘‘TED.’’ Six sets of thermocouples are located at four depths andmore » at 1 mm and 1.5 mm from the tool and extrudate interface. (b) Process temperature data as functions of positions of the thermocouples.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.