Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9802711 | Intermetallics | 2005 | 7 Pages |
Abstract
The high-cycle fatigue (HCF) behavior of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 (in at.%) bulk-metallic glass (BMG) was studied. Two batches of samples that are from different lots (Batches 59 and 94) are employed in present experiments. The HCF experiments were conducted, using an electrohydraulic machine at a frequency of 10Â Hz with a R ratio of 0.1 in air at room temperature and under tension-tension loading, where R=Ïmin./Ïmax.. (Ïmin. and Ïmax. are the applied minimum and maximum stresses, respectively). A high-speed and high-sensitivity thermographic-infrared (IR) imaging system was employed for the nondestructive evaluation of temperature evolutions during fatigue testing. No distinct sparking phenomenon was observed at the final fracture moment for this alloy. The fatigue lifetime of Batch 59 is longer than that of Batch 94 at high stress levels (maximum stresses >864Â MPa). Moreover, the fatigue-endurance limit of Batch 59 (703Â MPa) is somewhat greater than that of Batch 94 (615Â MPa). The vein pattern and liquid droplets were observed in the apparent-melting region along the edge of the fractured surfaces. The fracture morphology suggests that fatigue cracks initiated from casting defects, such as porosities and inclusions, which have an important effect on the fatigue behavior of BMGs.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
G.Y. Wang, P.K. Liaw, A. Peker, B. Yang, M.L. Benson, W. Yuan, W.H. Peter, L. Huang, M. Freels, R.A. Buchanan, C.T. Liu, C.R. Brooks,