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Acta Metall Sin  2022, Vol. 58 Issue (10): 1316-1324    DOI: 10.11900/0412.1961.2021.00077
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Kinetic Crystallization Behavior of Amorphous U60Fe27.5Al12.5 Alloy
HAN Luhui1, KE Haibo2(), ZHANG Pei1, SANG Ge1, HUANG Huogen1()
1.Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China
2.Songshan Lake Materials Laboratory, Dongguan 523808, China
Cite this article: 

HAN Luhui, KE Haibo, ZHANG Pei, SANG Ge, HUANG Huogen. Kinetic Crystallization Behavior of Amorphous U60Fe27.5Al12.5 Alloy. Acta Metall Sin, 2022, 58(10): 1316-1324.

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Abstract  

Due to their high strength and excellent anticorrosive properties, U-based amorphous alloys are quite promising for applications in nuclear-related fields. However, they face the challenge of crystallization due to high temperatures during some applications. Currently, focus on the crystallization mechanism of such materials is limited; thus, further investigation is required. Herein, using differential scanning calorimetry, both nonisothermal and isothermal crystallization kinetics of typical amorphous U60Fe27.5Al12.5 alloy were investigated. This alloy was further analyzed using different theoretical methods. The alloy exhibited the glass transition activation energy of slightly more than 270 kJ/mol and the melt fragility value of about 22, indicating that it is a strong metallic glass material. Based on the first exothermal crystallization peak, this glassy alloy is believed to possess the crystallization activation energy of 205-275 kJ/mol within nonisothermal method and 280-390 kJ/mol within the other method. The former value is much lower than the latter, which is consistent with the results of the conventional amorphous alloys. This general trend is mainly because crystallization can be activated more easily by a continuous increase in temperature. The kinetic factor of the alloy was in the ranges of 3-4 and 2.5-3 under the nonisothermal and isothermal conditions, respectively, demonstrating that the devitrification of the noncrystalline U-Fe-Al alloy greatly depends on the nucleation process, which is prone to occur during a rise in temperature.

Key words:  uranium alloy      amorphous alloy      crystallization mechanism      thermal analysis     
Received:  25 February 2021     
ZTFLH:  TG139  
Fund: Joint Funds of National Natural Science Foundation of China(U2030208);National Natural Science Foundation of China(51731002);Strengthening Fundamental Foundation Project(JCJQ-20190415);Fund of Science and Technology on Surface Physics and Chemistry Laboratory(6142A02200205)
About author:  KE Haibo, professor, Tel: (0769)89136229, E-mail: kehaibo@sslab.org.cn;HUANG Huogen, professor, Tel: (0816)3626968, E-mail: hhgeng2002@sina.com

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00077     OR     https://www.ams.org.cn/EN/Y2022/V58/I10/1316

Fig.1  DSC curves of U60Fe27.5Al12.5 amorphous alloy at different heating rates (a), Kissinger plots (b) and Ozawa plots (c) to calculate the activation energies relative to Eg, Ex and m and extrapolation of Tg, Tx1, and Tx2 at different heating rates to obtain the Kauzmann temperature (TK) (d) (θ—heating rate;T—temperature; Tg—glass transition temperature; Tx1 and Tx2—crystallization temperatures; Eg—activation energy relative to Tg; Ex1 and Ex2—activation energies relative to Tx1 and Tx2, respectively; m—fragility)
θ / (K·min-1)Tg / KTx1 / KTx2 / K
10630677734
20637687742
40645698754
80653710768
160664722781
Table 1  Thermodynamic temperatures of U60Fe27.5Al12.5 amorphous alloy
EgEx1Ex2m
kJ·min-1kJ·min-1kJ·min-1
KiOzKiOzKiOzKiOz
274.5271.3237.4236.8260.6259.822.522.2
Table 2  Activation energies and fragility of U60Fe27.5Al12.5 amorphous alloy corresponding to Table 1 (Ki and Oz denote the Kissinger and Ozawa methods, respectively)
Fig.2  DSC curves at various heating rates (a) and plots of the crystallization volume fraction (x) (b) as a function of temperature of U60Fe27.5Al12.5 amorphous alloy
Fig.3  The Ozawa plots of -lnθ vs 1000 / T at different x (a), and the activation energy(Ec) as a function of x (b) of U60Fe27.5Al12.5 amorphous alloy
Fig.4  ln[-ln(1 - x)] vs 1000 / T plots at various heating rates (a), and plots of local kinetic factor (n) as a function of x (b) of U60Fe27.5Al12.5 amorphous alloy
Fig.5  DSC curves (a) and plots of x (b) as a function of the annealing temperature (t) of U60Fe27.5Al12.5 amorphous alloy annealed at different temperatures
Fig.6  Plots of crystallization time vs annealing temperature (a), and the activation energy as a function of x (b) of U60Fe27.5Al12.5 amorphous alloy annealed at different temperatures
Fig.7  Plots of ln[-ln(1 - x)] vs ln(t -τ) at various annealing temperatures (a), and plots of n as a function of 1 - x (b) of U60Fe27.5Al12.5 amorphous alloy (τ is the induction period before crystalliz-ation, n is local kinetic exponent)
Metallic glassTg / KTx / K

Eg

kJ·min-1

Ex or Ep / (kJ·min-1)nRef.
Zr41Ti14Cu12.5Ni10Be22.5

626

(10 K·min-1)

692

(10 K·min-1)

~557 (Ki)~192 (Ki)-[23]
Zr55Cu30Al10Ni5

~681

(20 K·min-1)

~764

(20 K·min-1)

894 (Ki)

230 (Ki)

245 (JMA, Iso)

2.6-3.1

(JMA, Iso)

[19]
Cu47Ti33Zr11Ni8Si1

691

(20 K·min-1)

752

(20 K·min-1)

-

~339 (Ki)

~354 (JMA, Iso)

2.8-3.5

(JMA, Iso)

[24]
Co43Fe20Ta5.5B31.5

~940

(25 K·min-1)

~980

(25 K·min-1)

-

437~595 (Ki)

432~582 (Oz)

-[25]
Cu46Zr45Al7Y2-

~741

(10 K·min-1)

-

340~361 (Ki)

484 (JMA, Iso)

2.4-2.7

(JMA, Iso)

[20]
Cu15(As2Se3)85

~463

(20 K·min-1)

~557

(20 K·min-1)

~282 (Ki)~172 (Ki)

~3.8

(JMA, Non-iso)

[26]
Zr60Cu20Al10Ni10

~670

(20 K·min-1)

~740

(20 K·min-1)

-

202~327 (Ki)

215~339 (Oz)

1.5-15.7

(JMA, Non-iso)

[27]
Ca65Mg15Zn20

~375

(20 K·min-1)

~408

(20 K·min-1)

~148 (Ki)

116~124 (Ki)

147~178 (JMA, Iso)

2.0-2.7

(JMA, Iso)

[28]
Cu54Zr37Ti8In1

700

(25 K·min-1)

729

(25 K·min-1)

~321 (Ki)331~392 (Ki)

2.0-4.5

(JMA, Non-iso)

[29]
Zr46Cu38Ag8Al8-

~784

(20 K·min-1)

-

~310 (Ki)

~451 (JMA, Iso)

4.1-4.8

(JMA, Iso)

[30]

Ti16.7Zr16.7Hf16.7Cu16.7

Ni16.7Be16.7

~700

(20 K·min-1)

~740

(20 K·min-1)

~332 (Ki)

215~246 (Ki)

~260 (JMA, Iso)

1.8-2.1

(JMA, Iso)

[31]
U64Co28.5Al7.5

616

(20 K·min-1)

638

(20 K·min-1)

338 (Ki)200~250 (Ki)

1.5-11.0

(JMA, Non-iso)

[32]
Table 3  Characteristic temperatures and crystallization kinetic parameters of some amorphous alloys[19,20,23-32]
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