On the formation, mechanical properties and crystallization behaviors of a Zr56Co24Al20 bulk metallic glass

An amorphous Zr56Co24Al20 alloy, prepared by water-cooled copper mold suction casting technique, showed high yield strength of approximately 2177 MPa and a pronounced plastic strain. Comparative research indicated that the compression strength and specific strength improved obviously with the increa...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-10, Vol.647, p.204-208
Main Authors: Qin, X.M., Tan, J., Li, C.J., Wang, X.C., Jiang, Y.H., Zhou, R.
Format: Article
Language:English
Subjects:
Amorphous materials
Rapid-solidification
Thermal analysis
X-ray diffraction
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Summary:An amorphous Zr56Co24Al20 alloy, prepared by water-cooled copper mold suction casting technique, showed high yield strength of approximately 2177 MPa and a pronounced plastic strain. Comparative research indicated that the compression strength and specific strength improved obviously with the increasing Al/Co ratio in Zr56Co44−xAlx (x = 12, 16 and 20) bulk metallic glasses (BMGs). Moreover, the width of the super-cooled liquid region increased, indicating a better thermal stability of the super-cooled liquid. However, more Al content enhanced the crystallization process and hence reduced the activation energy. This work might have some implications for designing high specific strength BMGs with high glass forming ability. [Display omitted] •The as-cast Zr56Co24Al20 alloy showed high yield strength and large plasticity.•Specific strength improved with the increasing Al/Co ratio in ZrCoAl BMGs.•Better thermal stability with the increasing Al/Co ratio.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.04.241