TITLE

A Highly Fatigue-Resistant Zr-Based Bulk Metallic Glass

AUTHOR(S)
Naleway, Steven E.; Greene, Rawley B.; Gludovatz, Bernd; Dave, Neil K. N.; Ritchie, Robert O.; Kruzic, Jamie J.
PUB. DATE
December 2013
SOURCE
Metallurgical & Materials Transactions. Part A;Dec2013, Vol. 44 Issue 12, p5688
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The strength-normalized fatigue endurance strength of the bulk metallic glass (BMG) Zr 52.5Cu 17.9Ni 14.6Al 10Ti 5 (Vitreloy 105) has been reported to be the highest for any BMG; however, to date, there has been no explanation of why this material is so much better than other Zr-based compositions. In this study, the fatigue-crack growth behavior of Zr 52.5Cu 17.9Ni 14.6Al 10Ti 5 was compared in ambient air vs dry nitrogen environment. The excellent fatigue life behavior is attributed to a relatively high fatigue threshold (Δ KTH ≈ 2 MPa√m) and a lack of sensitivity to environmental effects on fatigue-crack growth in ambient air, as compared to other Zr-based BMGs. Fatigue life experiments conducted in ambient air confirmed the excellent fatigue life properties with a 10 7-cycle endurance strength of ~0.24 of the ultimate tensile strength; however, it was also found that casting porosity, even in limited amounts, could reduce this endurance strength by as much as ~60 pct. Overall, the BMG Zr 52.5Cu 17.9Ni 14.6Al 10Ti 5 appears to have excellent strength and fatigue properties and should be considered as a prime candidate material for future applications where good mechanical fatigue resistance is required.
ACCESSION #
91988535

 

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