Chapter 45. Processing, Deformation, and Fracture of Ni-Al2O3 Composites with and Without Graded Microstructures

  1. Don Bray
  1. Andrew N. Winter1,
  2. Brian A. Corff1,
  3. Ivar E. Reimanis1 and
  4. Barry H. Rabin2

Published Online: 23 MAR 2010

DOI: 10.1002/9780470294499.ch45

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

How to Cite

Winter, A. N., Corff, B. A., Reimanis, I. E. and Rabin, B. H. (1998) Processing, Deformation, and Fracture of Ni-Al2O3 Composites with and Without Graded Microstructures, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294499.ch45

Author Information

  1. 1

    Colorado School of Mines Department of Metallurgical and Materials Engineering 1500 Illinois Street Golden CO 80401

  2. 2

    Idaho National Engineering and Environmental Laboratory (INEEL) P.O. Box 1625–2218 Idaho Falls ID 83415

Publication History

  1. Published Online: 23 MAR 2010
  2. Published Print: 1 JAN 1998

ISBN Information

Print ISBN: 9780470375594

Online ISBN: 9780470294499

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Keywords:

  • proactive;
  • inextricably;
  • analyzed;
  • formulating;
  • empowering

Summary

Compositionally graded and non-graded composites consisting of Al2O3 and Ni, ranging from 0 to 100 vol.% Ni have been synthesized by uniaxial hot pressing and hot isostatic pressing. A systematic study on the role of powder additives in achieving desirable green densities was conducted so the amount of sintering shrinkage for each composition could be controlled; in this way the differential shrinkage in the graded composites could be minimized. The microstructures have been controlled using several different starting particle sizes of Al2O3 and Ni. The deformation and fracture of graded and non-graded composites was examined through microindentation experiments and conducting crack propagation experiments with compact tension specimens. Weak interfacial bonding was observed in many of the composites, resulting in little plastic deformation in the Ni phase during fracture, and correspondingly low fracture energies. The relative particle sizes are also important in determining the fracture behavior. The relationships between processing, deformation, and fracture of these composites are discussed.