Masters Theses


Bharat Gattu


"Composite materials have an edge over monolithic materials due to higher strength/stiffness - to - density ratios, improved fatigue and wear resistance and better high temperature properties. Surface composites provide improved tribological properties such as wear resistance, friction coefficient and corrosion resistance. Friction stir processing (FSP) which originated from friction stir welding (FSW - a method for joining aluminum alloys) is a solid state technique to modify the microstructure of the alloys. During FSP the frictional heat generated at the tool - work piece interface plasticizes the material allowing it to flow around the pin. The combined effect of the plastic deformation and the generated heat leads to grain refinement in the alloys.

In the present work, effort has been made to expand the scope of FSP as a novel method for the synthesis of surface composites. Different ways for incorporation of SiC particles into Al1100 alloy were explored and compared with each other. The response of the flow of the powder in the substrate during FSP has been studied for different processing features. The effects of various parameters and methodology on the incorporation and distribution of SiC particles in the nugget, the microstructure and mechanical properties of the composite layer were studied"--Abstract, page iv.


Mishra, Rajiv S.

Committee Member(s)

Miller, F. Scott, 1956-
Dharani, Lokeswarappa R.


Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering


National Science Foundation (U.S.). Industry & University Cooperative Research Program


This work was performed under the NSF-IUCRC for Friction Stir Processing (NSF-EEC-0531019)


Missouri University of Science and Technology

Publication Date

Summer 2009

Journal article titles appearing in thesis/dissertation

  • Study of various process features for the fabrication of surface composites using friction stir processing
  • Fabrication of A11100-SiCp surface composites using friction stir process and study of their mechanical properties


x, 54 pages

Note about bibliography

Includes bibliographical references.


© 2009 Bharat Gattu, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Friction stir welding
Heat resistant materials -- Testing
Aluminum alloys -- Metallurgy
Composite materials -- Microstructure
Composite materials -- Mechanical properties

Thesis Number

T 10246

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Electronic OCLC #