Fatigue crack-growth in shape-memory NiTi and NiTi-TiC composites

R. Vaidyanathan; D. C. Dunand; U. Ramamurty

doi:10.1016/S0921-5093(00)00882-0

Fatigue crack-growth in shape-memory NiTi and NiTi-TiC composites

R. Vaidyanathan, D. C. Dunand, U. Ramamurty^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

An experimental study was conducted to examine the room-temperature fatigue crack-growth characteristics of shape-memory NiTi matrix composites reinforced with 10 and 20 vol.% of TiC particles. Microstructural characterization of these hot-isostatically-pressed materials shows that the TiC particles do not react with the NiTi matrix and that they lack any texture. Overall fatigue crack-growth characteristics were found to be similar for the unreinforced and reinforced materials. However, a slight increase in the threshold for fatigue crack initiation was noted for the composites. The fracture toughness, as indicated by the failure stress intensity factor range, was found to be similar for all materials. Neutron diffraction studies near the crack-tip of the loaded fracture NiTi specimen detected no significant development of texture at the crack-tip. These results are explained by recourse to fractographic observations. Finally, a comparison is made between the micromechanisms of fracture of metal matrix composites, which deform by dislocation plasticity, and those of the present NiTi-TiC composites, which deform additionally by twinning.

Original language	English (US)
Pages (from-to)	208-216
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	289
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(00)00882-0
State	Published - 2000

Funding

The authors thank Professor S. Suresh (Massachusetts Institute of Technology) for the use of his mechanical testing facilities at the Laboratory for Experimental and Computational Micromechanics (LEXCOM) and for many helpful discussions. This work has also benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory (LANL), funded by the US Department of Energy and operated by the University of California under Contract W-7405-ENG-36. RV and DCD acknowledge financial support from Daimler-Benz AG, Germany. Experimental help from Dr M.A.M. Bourke (LANL) and Mr G. LaBonte (LEXCOM) is also gratefully acknowledged.

Keywords

Fatigue and fracture
Metal matrix composites
Micromechanisms
Neutron diffraction
Shape memory alloys

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
General Materials Science

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10.1016/S0921-5093(00)00882-0

Cite this

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title = "Fatigue crack-growth in shape-memory NiTi and NiTi-TiC composites",

abstract = "An experimental study was conducted to examine the room-temperature fatigue crack-growth characteristics of shape-memory NiTi matrix composites reinforced with 10 and 20 vol.% of TiC particles. Microstructural characterization of these hot-isostatically-pressed materials shows that the TiC particles do not react with the NiTi matrix and that they lack any texture. Overall fatigue crack-growth characteristics were found to be similar for the unreinforced and reinforced materials. However, a slight increase in the threshold for fatigue crack initiation was noted for the composites. The fracture toughness, as indicated by the failure stress intensity factor range, was found to be similar for all materials. Neutron diffraction studies near the crack-tip of the loaded fracture NiTi specimen detected no significant development of texture at the crack-tip. These results are explained by recourse to fractographic observations. Finally, a comparison is made between the micromechanisms of fracture of metal matrix composites, which deform by dislocation plasticity, and those of the present NiTi-TiC composites, which deform additionally by twinning.",

keywords = "Fatigue and fracture, Metal matrix composites, Micromechanisms, Neutron diffraction, Shape memory alloys",

author = "R. Vaidyanathan and Dunand, {D. C.} and U. Ramamurty",

note = "Funding Information: The authors thank Professor S. Suresh (Massachusetts Institute of Technology) for the use of his mechanical testing facilities at the Laboratory for Experimental and Computational Micromechanics (LEXCOM) and for many helpful discussions. This work has also benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory (LANL), funded by the US Department of Energy and operated by the University of California under Contract W-7405-ENG-36. RV and DCD acknowledge financial support from Daimler-Benz AG, Germany. Experimental help from Dr M.A.M. Bourke (LANL) and Mr G. LaBonte (LEXCOM) is also gratefully acknowledged. ",

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N1 - Funding Information: The authors thank Professor S. Suresh (Massachusetts Institute of Technology) for the use of his mechanical testing facilities at the Laboratory for Experimental and Computational Micromechanics (LEXCOM) and for many helpful discussions. This work has also benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory (LANL), funded by the US Department of Energy and operated by the University of California under Contract W-7405-ENG-36. RV and DCD acknowledge financial support from Daimler-Benz AG, Germany. Experimental help from Dr M.A.M. Bourke (LANL) and Mr G. LaBonte (LEXCOM) is also gratefully acknowledged.

PY - 2000

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N2 - An experimental study was conducted to examine the room-temperature fatigue crack-growth characteristics of shape-memory NiTi matrix composites reinforced with 10 and 20 vol.% of TiC particles. Microstructural characterization of these hot-isostatically-pressed materials shows that the TiC particles do not react with the NiTi matrix and that they lack any texture. Overall fatigue crack-growth characteristics were found to be similar for the unreinforced and reinforced materials. However, a slight increase in the threshold for fatigue crack initiation was noted for the composites. The fracture toughness, as indicated by the failure stress intensity factor range, was found to be similar for all materials. Neutron diffraction studies near the crack-tip of the loaded fracture NiTi specimen detected no significant development of texture at the crack-tip. These results are explained by recourse to fractographic observations. Finally, a comparison is made between the micromechanisms of fracture of metal matrix composites, which deform by dislocation plasticity, and those of the present NiTi-TiC composites, which deform additionally by twinning.

AB - An experimental study was conducted to examine the room-temperature fatigue crack-growth characteristics of shape-memory NiTi matrix composites reinforced with 10 and 20 vol.% of TiC particles. Microstructural characterization of these hot-isostatically-pressed materials shows that the TiC particles do not react with the NiTi matrix and that they lack any texture. Overall fatigue crack-growth characteristics were found to be similar for the unreinforced and reinforced materials. However, a slight increase in the threshold for fatigue crack initiation was noted for the composites. The fracture toughness, as indicated by the failure stress intensity factor range, was found to be similar for all materials. Neutron diffraction studies near the crack-tip of the loaded fracture NiTi specimen detected no significant development of texture at the crack-tip. These results are explained by recourse to fractographic observations. Finally, a comparison is made between the micromechanisms of fracture of metal matrix composites, which deform by dislocation plasticity, and those of the present NiTi-TiC composites, which deform additionally by twinning.

KW - Fatigue and fracture

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KW - Micromechanisms

KW - Neutron diffraction

KW - Shape memory alloys

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Fatigue crack-growth in shape-memory NiTi and NiTi-TiC composites

Abstract

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Keywords

ASJC Scopus subject areas

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