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Ambient- to elevated-temperature fracture and fatigue properties of Mo-Si-B alloys: Role of microstructure

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Abstract

Ambient- to elevated-temperature fracture and fatigue-crack growth results are presented for five Mo-Mo3Si-Mo5SiB2-containing α-Mo matrix (17 to 49 vol pct) alloys, which are compared to results for intermetallic-matrix alloys with similar compositions. By increasing the α-Mo volume fraction, ductility, or microstructural coarseness, or by using a continuous α-Mo matrix, it was found that improved fracture and fatigue properties are achieved by promoting the active toughening mechanisms, specifically crack trapping and crack bridging by the α-Mo phase. Crack-initiation fracture toughness values increased from 5 to 12 MPa√m with increasing α-Mo content from 17 to 49 vol pct, and fracture toughness values rose with crack extension, ranging from 8.5 to 21 MPa√m at ambient temperatures. Fatigue thresholds benefited similarly from more α-Mo phase, and the fracture and fatigue resistance was improved for all alloys tested at 1300 °C, the latter effects being attributed to improved ductility of the α-Mo phase at elevated temperatures.

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Authors and Affiliations

  1. the Department of Mechanical Engineering, Oregon State University, 97331, Corvallis, OR

    J. J. Kruzic (Assistant Professor)

  2. Oak Ridge National Laboratory, Metals and Ceramics Division, 37831, Oak Ridge, TN

    J. H. Schneibel (Senior Research Staff Member)

  3. the Materials Sciences Division, Lawrence Berkeley National Laboratory, and the Department of Materials Science and Engineering, University of California, 94720, Berkeley, CA

    R. O. Ritchie (Professor)

Authors
  1. J. J. Kruzic
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  2. J. H. Schneibel
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  3. R. O. Ritchie
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Kruzic, J.J., Schneibel, J.H. & Ritchie, R.O. Ambient- to elevated-temperature fracture and fatigue properties of Mo-Si-B alloys: Role of microstructure. Metall Mater Trans A 36, 2393–2402 (2005). https://doi.org/10.1007/s11661-005-0112-5

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  • DOI: https://doi.org/10.1007/s11661-005-0112-5

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