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Acta Metall Sin    DOI: 10.11900/0412.1961.2014.00485
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EFFECT OF MINOR SN, NB ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF ZR-CU-FE-AL BULK METALLIC GLASS
University of Science & Technology Beijing
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Abstract  New Ni-free Zr61.5Cu21.5-xFe5Al11Sn1Nbx (x=0,1, 2 atomic fraction, %) and Zr61.5Cu21.5Fe5Al12 bulk metallic glasses (BMGs) rods with a diameters of 2 and 3 mm were fabricated by copper mold casting. In order to improve the plasticity of the Zr61.5Cu21.5Fe5Al12 BMG, minor Sn and Nb elements with lower thermal neutron cross-sections have been added into the Zr-Cu-Fe-Al alloy. The experimental results showed that the glass-forming abilities of the BMGs with Sn and Nb elements were reduced slightly. Among them with Sn and Nb elements, however, Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG exhibits high compressive strength, high ductility together with extensive ‘‘work hardening’’. HRTEM study verifies the glassy states of both Zr61.5Cu19.5Fe5Al11Sn1Nb2 and Zr61.5Cu21.5Fe5Al12 alloys samples. The difference between the microstructures of the BMGs samples with and without Sn and Nb elements is that the atomic arrangement in Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG is more closely than that in Zr61.5Cu21.5Fe5Al12 BMG. Positron annihilation lifetime spectroscopy study showed further that the Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG has more closely atomic arrangement than the Zr61.5Cu21.5Fe5Al12 BMG. The structural free-volume size of the former BMG is smaller than that of the latter BMG. And the total free-volume amount of the former BMG is obviously higher than that of the latter BMG. Uniformly distributed free volume is beneficial to improve the shear band formation, branching, and interactions of the Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG, which increases finally the compressive ductility of the BMG.
Key words:  Minor Sn and Nb additions      Zr-Cu-Fe-Al bulk metallic glass      thermal stability      plasticity     
Received:  02 September 2014     
Corresponding Authors:  BIN YANG   
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. EFFECT OF MINOR SN, NB ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF ZR-CU-FE-AL BULK METALLIC GLASS. Acta Metall Sin, 0, (): 0-0.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00485     OR     https://www.ams.org.cn/EN/Y0/V/I/0

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