A new process for design and manufacture of tailor-made functionally graded composites through friction stir additive manufacturing

Sharma, Abhay and Bandari, V and Ito, K and Kohama, K and M, Ramji and Himasekhar, H S (2017) A new process for design and manufacture of tailor-made functionally graded composites through friction stir additive manufacturing. Journal of Manufacturing Processes, 26. pp. 122-130. ISSN 1526-6125

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Motivated by the recent use of friction stirring in the manufacture of in-situ composites, a new additive manufacturing method for the design and manufacture of tailor-made functionally graded composites is presented. The existing literature on the subject matter is limited to creating functional grades in the vicinity of the weld nugget without direct control on composition and property gradients. A mathematical model is developed for achieving a compositional gradient over a predefined length in a metal matrix composite and subsequently demonstrated through the manufacture of aluminum + TiC functionally graded composite. Progressive gradients are observed in hardness and local mechanical properties, namely, Young's modulus, stain hardening exponent, and yield stress obtained using the digital image correlation technique. The process mechanism is elucidated by correlating results of mechanical tests and electron backscatter diffraction analysis. A specific process condition vis-à-vis the number of passes, volume faction, and particle size combination may promote one or more phenomena such as continuous dynamic recrystallization, particle fragmentation, and breaking of initial matrix grains, which eventually affect particle mixing and matrix grain size and thus cause property gradients. The findings are expected to enable the manufacture of functionally graded composites products of larger size.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Uncontrolled Keywords: Additive manufacturing; Digital image correlation; Friction stirring; Functionally graded composite; Mechanical properties; Microstructural analysis
Subjects: ?? sub4.9 ??
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 14 Mar 2017 10:30
Last Modified: 21 Jun 2018 11:36
URI: http://raiith.iith.ac.in/id/eprint/3090
Publisher URL: http://dx.doi.org/10.1016/j.jmapro.2017.02.007
OA policy: http://www.sherpa.ac.uk/romeo/issn/1526-6125/
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