ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
High-temperature plastic flow and tensile ductility in pre-annealed Zr65Al10Ni10Cu15 bulkmetallic glass are examined in a supercooled liquid region. The specimen annealed at 673K for1.8ks before the tensile test exhibits uniform deformation, and large elongation of 1100% isobtained in the tensile test at 673K and in a constant true strain rate of 1×10-2s-1. In the specimen,initial stress decreases in comparison with that of the specimen without annealing, but apparentstrain hardening arise during deformation. SEM analysis after the deformation reveals that thecavitation is very limited even at the fracture tip. XRD and TEM analyses reveal that icosahedralphase is observed only in gage section but not in grip section after the deformation. The limitedcavitation due to the accommodation of stress concentration through the grain boundary amorphousphase possibly makes a positive contribution to the large elongation in the annealed specimen, aswell as the neck stability due to the strain hardening by the interaction between the icosahedralphase particles increasingly crystallized by the local strain
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1449.pdf
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