Mechanical Properties/Mirostructure Correlation in a Devitrifid Fe-Based Metallic Glass

N. A. Mara, A. V. Sergueeva, A. K. Mukherjee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One of the greatest challenges of testing the high-temperature mechanical properties of nanocrystalline materials is to find a single-phase material that is stable at test temperature. Tensile tests of different microstructures arising from different heat treatments of Fe-based metallic glass are presented. Most interestingly, a single phase α-Fe microstructure with equiaxed, randomly oriented 15 nm grains is produced through the devitrification of Vitroperm (Fe 73.5Cu 1Nb 3Si 15.5B 7) metallic glass. This microstructure was stable during tensile testing at 600°C, showing a strain rate exponent correlating to grain boundary sliding (m=0.5), but little ductility, and strengths to 1250 MPa. It is suggested that the lack of dislocation activity at the small grain sizes can cause the observed brittle behavior. At temperatures up to 725°C, grain growth occurs, leading to elongations as large as 65% at flow stresses of 250 MPa. This investigation is supported by NSF, Division of Materials Research, grant NSF-DMR-0240144.

Original languageEnglish (US)
Title of host publicationProcessing and Properties of Structural Nanomaterial
Subtitle of host publicationProceedings of Symposia held at the Materials Science and Technology 2003 Meeting
EditorsL.L. Shaw, C. Suryanarayana, R.S. Mishra, L.L. Shaw, C. Suryanarayana, R.S. Mishra
Pages101-108
Number of pages8
StatePublished - Dec 1 2003
EventProcessing and Properties of Structural Nanomaterials: Proceedings of Symposia held at Materials Science and Technology 2003 Meeting - Chicago, Il, United States
Duration: Nov 9 2003Nov 12 2003

Publication series

NameProcessing and Properties of Structural Nanomaterial: Proceedings of Symposia held at the Materials Science and Technology 2003 Meeting

Other

OtherProcessing and Properties of Structural Nanomaterials: Proceedings of Symposia held at Materials Science and Technology 2003 Meeting
CountryUnited States
CityChicago, Il
Period11/9/0311/12/03

Keywords

  • Devitrified metallic glass
  • Mechanical properties
  • Nanocrystalline

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