TY - JOUR
T1 - The effects of texture and grain morphology on the fracture toughness and fatigue crack growth resistance of nanocrystalline platinum films
AU - Meirom, Roi A.
AU - Clark, Trevor E.
AU - Muhlstein, Christopher L.
N1 - Funding Information:
Thanks to the Army Research Labs and the Army Research Office staff (Madan Dubey, Ronald Polcawich, Jeff Pulskamp, Joel Martin, Brian Power, Prashant Ranade and Richard Piekarz) for processing and fabrication of specimens used in this study. Thanks to Josh Maeir and Nichole Wonderling from Penn State’s Materials Research Institute for TEM sample preparation assistance and texture measurements, respectively. This work was supported by the National Science Foundation (“CAREER: Education and Research in Nanomaterial Degradation—The Road to Molecular Fatigue Studies”, DMR-0449684) and US Army Research Office (ARO W911NF-05-1-00640). This work was also supported by the Pennsylvania State University Materials Research Institute NanoFabrication Network and the National Science Foundation Cooperative Agreement No. 0335765 under Contract CMS-0528234, National Nanotechnology Infrastructure Network, with Cornell University.
Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.
PY - 2015/1
Y1 - 2015/1
N2 - The fracture toughness and fatigue crack growth resistance of nanocrystalline materials are significantly affected by the thickness of the specimen. In this work we relate the mechanical properties of nanocrystalline platinum films to their texture and grain morphology. Tensile, creep and fatigue testing of annealed, ∼1 μm films resulted in mechanical properties similar to the as-received films (yield strength of ∼1.2 GPa, fracture toughness ∼17.8 MPa √m, and a fatigue crack growth power law exponent of ∼4.2). However, the breakdown of the initially columnar grain morphology had a marked effect on the transition point from an intergranular to transgranular fatigue cracking mode. Finite element modeling suggests that cyclic (fatigue) grain coarsening and the transition from inter- to transgranular cracking modes are a result of the relative importance of dislocation slip accommodation on in-plane and through-thickness oriented slip directions.
AB - The fracture toughness and fatigue crack growth resistance of nanocrystalline materials are significantly affected by the thickness of the specimen. In this work we relate the mechanical properties of nanocrystalline platinum films to their texture and grain morphology. Tensile, creep and fatigue testing of annealed, ∼1 μm films resulted in mechanical properties similar to the as-received films (yield strength of ∼1.2 GPa, fracture toughness ∼17.8 MPa √m, and a fatigue crack growth power law exponent of ∼4.2). However, the breakdown of the initially columnar grain morphology had a marked effect on the transition point from an intergranular to transgranular fatigue cracking mode. Finite element modeling suggests that cyclic (fatigue) grain coarsening and the transition from inter- to transgranular cracking modes are a result of the relative importance of dislocation slip accommodation on in-plane and through-thickness oriented slip directions.
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U2 - 10.1016/j.ijfatigue.2014.09.017
DO - 10.1016/j.ijfatigue.2014.09.017
M3 - Article
AN - SCOPUS:84908544642
VL - 70
SP - 258
EP - 269
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -