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Friction stir welding for aluminum metal matrix composites (MMC's) : MSFC Center director's discretionary fund final report, project no. 98-09

Author: J A Lee; R W Carter; J Ding; George C. Marshall Space Flight Center,
Publisher: MSFC, Alabama : National Aeronautics and Space Administration, Marshall Space Flight Center, December 1999.
Series: NASA technical memorandum, 1999-209876.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
This technical memorandum describes an investigation of using friction stir welding (FSW) process for joining a variety of aluminum metal matrix composites (MMC's) reinforced with discontinuous silicon-carbide (SiC) particulate and functional gradient materials. Preliminary results show that FSW is feasible to weld aluminum MMC to MMC or to aluminum-lithium 2195 if the SiC reinforcement is less than 25 percent by  Read more...
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Genre/Form: Online resources
Electronic government information
Additional Physical Format: Print version:
Friction stir welding for aluminum metal matrix composites (mmc's) (center director's discretionary final report)
(OCoLC)58949503
Microfiche version:
Lee, J. A.
Friction stir welding for aluminum metal matrix composites (MMC's)
(OCoLC)43464739
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: J A Lee; R W Carter; J Ding; George C. Marshall Space Flight Center,
OCLC Number: 703646163
Notes: "December 1999."
"Performing organization: George C. Marshall Space Flight Center"-- Report documentation page.
pdf
"Project no. 98-09."
Description: 1 online resource (vi, 21 pages) : illustrations.
Series Title: NASA technical memorandum, 1999-209876.
Other Titles: MSFC Center director's discretionary fund final report, project no. 98-09
Responsibility: J.A. Lee, R.W. Carter, and J. Ding.

Abstract:

This technical memorandum describes an investigation of using friction stir welding (FSW) process for joining a variety of aluminum metal matrix composites (MMC's) reinforced with discontinuous silicon-carbide (SiC) particulate and functional gradient materials. Preliminary results show that FSW is feasible to weld aluminum MMC to MMC or to aluminum-lithium 2195 if the SiC reinforcement is less than 25 percent by volume fraction. However, a softening in the heat-affected zone was observed and is known to be one of the major limiting factors for joint strength. The pin tool's material is made from a low-cost steel tool H-13 material, and the pin tool's wear was excessive such that the pin tool length has to be manually adjusted for every 5 ft of weldment. Initially, boron-carbide coating was developed for pin tools, but it did not show asignificant improvement in wear resistance. Basically, FSW is applicable mainly for butt joining of flatplates. Therefore, FSW of cylindrical articles such as a flange to a duct with practical diameters ranging from 2-5 in. must be fully demonstrated and compared with other proven MMC joining techniques for cylindrical article

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