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Controlling Residual Stress in Metal Matrix Ceramic FiberComposite

Published online by Cambridge University Press:  26 February 2011

Marwan Al-Haik ,
Hamid Garmestani  and
Yousef Haik
Marwan Al-Haik
Affiliation:
alhaik@unm.edu, University of New Mexico, Mechanical Engineering, MSC01 1150, 1 University Ave., Albuquerque, NM, 87131, United States, 505-277-1346, 505-277-1571
Hamid Garmestani
Affiliation:
hamid.garmestani@mse.gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, 71 Ferst Drive, N.W., Atlanta, GA, 30332, United States
Yousef Haik
Affiliation:
yhaik@uaeu.ac.ae, United Arab Emirates University, Mechanical Engineering, Al Ain, N/A, United Arab Emirates
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Abstract

In metal matrix composites the nature of the reinforcement can influence thedevelopment of residual stresses not only as a result of the mismatch in thethermal expansion coefficient between the fiber and the matrix but alsocaused by the interface of the materials during the processing cycles. Theresidual stress can be minimized through controlling the processing path andthe thermal environment. We studied the residual stress formation andevolution in gamma titanium aluminide (Ti-47AL-2Ta) matrix. The matrix wasreinforced with three different types of fibers: Alumina, Sapphikon, andTiboride through hot isostatic pressing. The composite was heat treated forvarious combinations of time: 100, 200 and 500 hours; and temperature:590C, 815C and 982 C respectively.Residual stresses were measured in the gamma phase of the matrix using X-Raydiffraction

Keywords

compositethermal stressesx-ray diffraction (XRD)

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