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Title: On the understanding of the effects of sample size on the variability in fracture toughness of bulk metallic glasses

Authors:
ORCiD logo; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1398583
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 126; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-07 03:39:21; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Gludovatz, Bernd, Granata, Davide, Thurston, Keli V. S., Löffler, Jörg F., and Ritchie, Robert O. On the understanding of the effects of sample size on the variability in fracture toughness of bulk metallic glasses. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2016.12.054.
Gludovatz, Bernd, Granata, Davide, Thurston, Keli V. S., Löffler, Jörg F., & Ritchie, Robert O. On the understanding of the effects of sample size on the variability in fracture toughness of bulk metallic glasses. United States. doi:10.1016/j.actamat.2016.12.054.
Gludovatz, Bernd, Granata, Davide, Thurston, Keli V. S., Löffler, Jörg F., and Ritchie, Robert O. Wed . "On the understanding of the effects of sample size on the variability in fracture toughness of bulk metallic glasses". United States. doi:10.1016/j.actamat.2016.12.054.
@article{osti_1398583,
title = {On the understanding of the effects of sample size on the variability in fracture toughness of bulk metallic glasses},
author = {Gludovatz, Bernd and Granata, Davide and Thurston, Keli V. S. and Löffler, Jörg F. and Ritchie, Robert O.},
abstractNote = {},
doi = {10.1016/j.actamat.2016.12.054},
journal = {Acta Materialia},
number = C,
volume = 126,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.actamat.2016.12.054

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • The recent development of metallic alloy systems which can be processed with an amorphous structure over large dimensions, specifically to form metallic glasses at low cooling rates ({approximately}10 K/s), has permitted novel measurements of important mechanical properties. These include, for example, fatigue-crack growth and fracture toughness behavior, representing the conditions governing the subcritical and critical propagation of cracks in these structures. In the present study, bulk plates of a Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} alloy, machined into 7 mm wide, 38 mm thick compact-tension specimens and fatigue precracked following standard procedures, revealed fracture toughnesses in the fully amorphous structuremore » of K{sub Ic}{approximately}55 MPa{radical}m, i.e., comparable with that of a high-strength steel or aluminum alloy. However, partial and full crystallization, e.g., following thermal exposure at 633 K or more, was found to result in a drastic reduction in fracture toughness to {approximately}1 MPa{radical}m, i.e., comparable with silica glass. The fully amorphous alloy was also found to be susceptible to fatigue-crack growth under cyclic loading, with growth-rate properties comparable to that of ductile crystalline metallic alloys, such as high-strength steels or aluminum alloys; no such fatigue was seen in the partially or fully crystallized alloys which behaved like very brittle ceramics. Possible micromechanical mechanisms for such behavior are discussed. {copyright} {ital 1997 American Institute of Physics.}« less
  • A class of beryllium-bearing bulk metallic glass alloys has recently been developed at the California Institute of Technology. These alloys can be fabricated in the form of large ingots with minimum dimensions on the order of centimeters, which allows valid mechanical tests to be performed on these materials. Such tests were not formerly possible given the small dimensions of earlier metallic glass specimens. Some basic physical and mechanical properties have been measured on specific beryllium-bearing bulk metallic glass with a nominal composition of Zr{sub 41.25}Ti{sub 13.75}Cu{sub 12.5}Ni{sub 10}Be{sub 2.5}, by the authors and some of their co-workers. The purpose ofmore » this paper is to report on the first ever direct measurement of the fracture toughness of any bulk metallic glass system.« less
  • A binary Ti{sub 50}Cu{sub 50} martensitic alloy having similar atomic clusters to (TiCu)-based martensitic bulk metallic glasses presents a large plastic strain of 18.04% with high fracture strength of 1705 MPa. Detailed microstructural investigations point out that martensite embedded in {gamma}-TiCu matrix is effective to dissipate localization of the shear stress thus leading to rotational propagation, interaction, and multiplication of the shear bands. Furthermore, the propagation of microcracks formed by local stress transition during deformation is hindered by the martensite.