Al-NiTi Metal Matrix Composites for Zero CTE Materials: Fabrication, Design, and Modeling

  • Adam Hehr
  • Xiang Chen
  • Joshua Pritchard
  • Marcelo J. Dapino
  • Peter M. Anderson


Al-NiTi composites fabricated via ultrasonic additive manufacturing (UAM) provide a light-weight solution for low thermal expansion applications. It is shown that the thermal expansion of Al 6061 can be reduced by over 50% by incorporating a 13% volume fraction of NiTi fibers. This reduction in thermal expansion occurs from the contraction of the NiTi fiber during heating, thereby offsetting the thermal expansion of the Al matrix. Al-NiTi composites are made possible by low temperature UAM process. Successful implementation of these composites requires a careful design approach that includes the processing characteristics as well as the thermo-mechanical response of the shape memory fibers and matrix. This is achieved using a NiTi microstructure based FEA model implemented that captures the underlying thermomechanical response of the NiTi fibers and calculates the complex stress state within the composite.


Composite Shape Memory Alloy Characterization Modeling 


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Copyright information

© TMS (The Minerals, Metals & Materials Society) 2015

Authors and Affiliations

  • Adam Hehr
    • 1
  • Xiang Chen
    • 2
  • Joshua Pritchard
    • 1
  • Marcelo J. Dapino
    • 1
  • Peter M. Anderson
    • 2
  1. 1.Department of Mechanical & Aerospace EngineeringThe Ohio State UniversityColumbusUSA
  2. 2.Department of Materials Science & EngineeringThe Ohio State UniversityColumbusUSA

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