Fatigue and fracture toughness of a Nb-Ti-Cr-Al-X single-phase alloy at ambient temperature |
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| Authors: | D L Davidson K S Chan R Loloee M A Crimp |
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| Affiliation: | (1) Present address: Southwest Research Institute, 78238 San Antonio, TX;(2) the Department of Materials Science and Mechanics, Michigan State University, 48824 East Lansing, MI |
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| Abstract: | The fatigue and fracture resistance of a commercially made, single-phase Nb-base alloy with 35 at. pct Ti, 5 at. pct Cr, 6
at. pct Al, and several elements to increase solid solution strengthening have been investigated. The threshold for fatigue
crack growth was determined to be ≈7 MPa√m and fracture toughness ≈35 MPa√m. Crack growth was intermittent and sporadic; the
fracture path was tortuous, crystallographic, and appeared to favor the {100} and {112} planes. Fatigue crack closure was
measured directly at the crack tip. The fatigue and fracture properties of the commercial alloy are compared against those
of Nb-Cr-Ti and Nb-Cr-Ti-Al alloys. The comparison indicated that Ti addition is beneficial for, but Al addition is detrimental
to, both fracture toughness and fatigue crack resistance. |
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