Combustion Mechanism of Fe-Nb-B-Y Amorphous Alloys with an Anomalous Exothermic Phenomenon

doi:10.11900/0412.1961.2020.00420

Acta Metall Sin

2021, Vol. 57

Issue (4): 542-552 DOI: 10.11900/0412.1961.2020.00420

Research paper

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Combustion Mechanism of Fe-Nb-B-Y Amorphous Alloys with an Anomalous Exothermic Phenomenon

HU Xiang¹, GE Jiacheng¹, LIU Sinan¹, FU Shu¹, WU Zhenduo²^,³, FENG Tao¹, LIU Dong⁴, WANG Xunli², LAN Si¹(

)

^1.Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering/Herbert Gleiter Institute, Nanjing University of Science and Technology, Nanjing 210094, China
^2.Department of Physics, City University of Hong Kong, Hong Kong 999077, China
^3.Applied Physics Centre of Neutron Scattering, Dongguan University of Hong Kong Research Institute, Dongguan 523808, China
^4.School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Cite this article:

HU Xiang, GE Jiacheng, LIU Sinan, FU Shu, WU Zhenduo, FENG Tao, LIU Dong, WANG Xunli, LAN Si. Combustion Mechanism of Fe-Nb-B-Y Amorphous Alloys with an Anomalous Exothermic Phenomenon. Acta Metall Sin, 2021, 57(4): 542-552.

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Abstract

The functional groups in traditional energetic materials typically contain C, N, and O. These elements are usually unstable and sensitive to external stimuli. Moreover, the chemicals used during the preparation process of traditional energetic materials are toxic and pose many safety and environmental issues. As one of the metastable materials, high-energy-state amorphous alloys are potential candidates for new energetic materials with high combustion heat, low ignition temperature, non-toxicity, and improved safety. In this work, the combustion mechanism of Fe-based amorphous ribbons with an anomalous exothermic phenomenon was systematically studied using in situ synchrotron X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Experimental results show that compared to Fe-Nb-B-Y amorphous alloys with normal thermophysical and combustion behaviors, (Fe_0.72B_0.24Nb_0.04)_95.5Y_4.5 amorphous ribbons with anomalous exothermic phenomena possess low ignition temperature and self-propagating combustion behavior due to the catalysis of the rapid crystallization exothermic process. The anomalous exothermic phenomenon and associated liquid-liquid phase transitions can cause rapid crystallization at elevated temperatures during heating, followed by multi-step oxidation. On the other hand, it was possible to significantly reduce the activation energy of high-temperature oxidation. The liquid-liquid phase transition can lower the energy barrier of the oxidation reaction. In this way, the oxidation reaction at high temperatures can be promoted. The results suggest that the liquid-liquid phase transition has an “induced activation” effect on the combustion of Fe-based amorphous alloys.

Key words: amorphous alloy liquid-liquid phase transition combustion energetic material

Received: 26 October 2020

ZTFLH:

TG146.4

Fund: National Natural Science Foundation of China(51871120);Natural Science Foundation of Jiangsu Province-Outstanding Youth Fund Project(BK20200019)

About author: LAN Si, professor, Tel: 18115156168, E-mail: lansi@njust.edu.cn

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	Xiang HU
	Jiacheng GE
	Sinan LIU
	Shu FU
	Zhenduo WU
	Tao FENG
	Dong LIU
	Xunli WANG
	Si LAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00420 OR https://www.ams.org.cn/EN/Y2021/V57/I4/542

Fig.1 The video snapshots by an optical camera of combustion phenomenon for Fe-Nb-B-Y metallic glasses (MGs) in air showing Y4.5 ribbon has the fastest burning rate compared to Y3 and Y7 MGs, while Y0 cannot finish self-propagating combustion

Fig.2 Thermal analysis results of Fe-Nb-B-Y MGs

Table 1 Thermophysical parameters of Fe-Nb-B-Y MGs

Table 2 Activation energies for different compositions from thermogravimetry (TG) measurements

Fig.3 A self-heating process of the Y4.5 bulk metallic glasses during the in situ synchrotron HE-XRD experiment upon heating (The self-heating rate is 24.4 K/s)

Fig.4 S(Q) (a-c) and G(r) (d-f) plots of Y4.5 MGs under different temperatures (The G(r) plots illustrate that the crystalline products for the samples after heating with different rates are different. S(Q)is the structure factor, G(r)is the reduced pair-distribution function, Q is the scattering wave vector and r is the distance in real space)

Fig.5 HE-XRD rietveld refinement results of the crystalline products of Y4.5 MGs with a regular slow heating rate and without a self-heating process (a), with a rapid heating rate and self-heating process in a high-purity Ar atmosphere (b) and after combustion in air (c), and OM image illustrating that the oxides and dendrites interweave after the combustion of the Y4.5 MGs (d)

Fig.6 HE-XRD rietveld refinement results of the crystalline products of Y0 (a), Y3 (b), and Y7 (c) MGs after combustion in air

Fig.7 XPS results of the oxides of Y0 (a), Y3 (b), Y4.5 (c), and Y7 (d) MGs after combustion in air

Fig.8 The video snapshots by an optical camera of combustion phenomenon for Y4.5 amorphous ribbon and traditional fuse in a humid environment (The environment temperature is 292 K, and the environment humidity is (95.0 ± 2.0)%. The traditional fuse stopped burning quickly after being ignited, while Y4.5 amorphous ribbon could conduct self-propagating combustion in the humid environment)

Fig.9 Schematics showing the combustion process of Y4.5 MGs (a), Y0, Y3, and Y7 MGs (b) in air (ΔH is the enthalpy change)

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