EFFECT OF MINOR Sn AND Nb ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF Zr-Cu-Fe-Al BULK METALLIC GLASS

doi:10.11900/0412.1961.2014.00485

Acta Metall Sin

2015, Vol. 51

Issue (4): 465-472 DOI: 10.11900/0412.1961.2014.00485

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EFFECT OF MINOR Sn AND Nb ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF Zr-Cu-Fe-Al BULK METALLIC GLASS

YANG Bin^1,²(

), LI Xin¹, LUO Wendong¹, LI Yuxiang¹

1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
2 Collaborative Innovation Center of Universal Iron & Steel Technology, University of Science and Technology Beijing, Beijing 100083

Cite this article:

YANG Bin, LI Xin, LUO Wendong, LI Yuxiang. EFFECT OF MINOR Sn AND Nb ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF Zr-Cu-Fe-Al BULK METALLIC GLASS. Acta Metall Sin, 2015, 51(4): 465-472.

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Abstract

New Ni-free Zr_61.5Cu_21.5_-_xFe₅Al₁₁Sn₁Nb_x (x=0,1, 2, atomic fraction, %) and Zr_61.5Cu_21.5Fe₅Al₁₂bulk metallic glasses (BMGs) rods with diameters of 2 and 3 mm were fabricated by copper mold casting. In order to improve the plasticity of the Zr_61.5Cu_21.5Fe₅Al₁₂BMG, minor Sn and Nb with lower thermal neutron cross-sections was 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, Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ BMG exhibits high compressive strength, high ductility together with extensive “work hardening”. HRTEM study verifies the glassy states of both Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ and Zr_61.5Cu_21.5Fe₅Al₁₂alloys samples. The difference between the microstructures of the BMGs samples with and without Sn and Nb elements is that the atomic arrangement in Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂BMG is more closely than that in Zr_61.5Cu_21.5Fe₅Al₁₂ BMG. Positron annihilation lifetime spectroscopy study showed further that the Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ BMG has more closely atomic arrangement than the Zr_61.5Cu_21.5Fe₅Al₁₂ 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 Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ 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

ZTFLH:

TG113.2

Fund: Supported by Beijing Municipal Natural Science Foundation (No.2122039) and Program for ChangJiang Scholars and Innovative Research Team in University and State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing

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	Bin YANG
	Xin LI
	Wendong LUO
	Yuxiang LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00485 OR https://www.ams.org.cn/EN/Y2015/V51/I4/465

Fig.1 XRD spectra of the Zr_61.5Cu_21.5Fe₅Al₁₂ (Z1) (a), Zr_61.5Cu_21.5Fe₅Al₁₁Sn₁ (b), Zr_61.5Cu_20.5Fe₅Al₁₁Sn₁Nb₁ (c) and Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ (Z2) (d) bulk metallic glasses (BMGs)

Fig.2 DSC curves of the Z2 and Z1 BMGs at heating rate of 20 K/min (T_g—the glass transition temperature, T_x₁—the first onset crystallization temperature, T_x2—the second onset crystallization temperature)

Table 1 Thermodynamic parameters and thermal neutron cross-sections of the Z2 and Z1 BMGs at heating rate of 20 K/min

Fig.3 DSC curves of the Z2 BMG at different heating rates

Table 2 Apparent activation energies of the Z2 and Z1^[10] BMGs

Fig.4 Kissinger plots of Tg, first crystallization peak temperature Tp1, second crystallization peak temperature Tp2 and crystallization temperature Tx for the Z2 BMG

Fig.5 Compressive stress-strain curves for the Z2 and Z1 BMGs with a diameter of 2 mm and at strain rate of 4×10^-⁴ s^-¹

Table 3 Compressive mechanical properties of Z2 and Z1 BMGs

Fig.6 HRTEM images (a, c) and IFT patterns (b, d) of the Z2 (a, b) and Z1 (c, d) BMGs obtained by the black square areas (Insets show corresponding SAED patterns)

Fig.7 SEM images of the fracture surfaces for the Z2 and Z1 BMGs

Fig.8 DSC traces for the Z2 and Z1 BMGs (Inset is the magnified DSC traces near the glass transition temperatures for the BMGs at heating rate of 10 K/min)

Table 4 Three components fit results of the Z2 and Z1 BMGs using positron annihilation lifetime spectroscopy

Table 5 Two components fit results of the Z1 and Z2 BMGs using positron annihilation lifetime spectroscop

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