Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr55Cu30Al10Ni5 Metallic Glass

doi:10.11900/0412.1961.2019.00140

Acta Metall Sin

2019, Vol. 55

Issue (12): 1544-1550 DOI: 10.11900/0412.1961.2019.00140

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Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr₅₅Cu₃₀Al₁₀Ni₅ Metallic Glass

YANG Gaolin¹,LIN Xin²(

),LU Xiangang¹

1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Cite this article:

YANG Gaolin, LIN Xin, LU Xiangang. Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr₅₅Cu₃₀Al₁₀Ni₅ Metallic Glass. Acta Metall Sin, 2019, 55(12): 1544-1550.

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Abstract

Laser additive manufacturing technology is a feasible technology for the fabrication of bulk metallic glass with complex geometry. It has the characteristics of small molten pool and high cooling rate. However, crystallization often occurs in heat affected zone (HAZ). In this work, laser multiple remelting of Zr₅₅Cu₃₀Al₁₀Ni₅ metallic glass by pulsed laser was carried out and the morphological evolution of the HAZ crystalline phase in the multiple remelting process was studied. The results show that with the increase of the remelting times, the crystalline grains number and size are both improved. With the growth of the grains, the crystallization caused by the growth of the crystalline grains in the molten pool also becomes more and more remarkable. Both the size and number of the grains in the HAZ increase linearly with the increase of the remelting times. The nucleation rate and growth rate of different metallic glass plates are close, whereas the initial crystalline grains number and size are different, which are attributed to the different cooling process in the copper casting of the metallic glass plates.

Key words: Zr₅₅Cu₃₀Al₁₀Ni₅metallic glass laser multiple remelting crystallization morphology evolution

Received: 05 May 2019

ZTFLH:

TG24

Fund: Supported by the Fund of the State Key Laboratory of Solidification Processing in NWPU(No.SKLSP201745);Zhejiang Provincial Natural Science Foundation of China(No.LY16E050014)

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	YANG Gaolin
	LIN Xin
	LU Xiangang

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00140 OR https://www.ams.org.cn/EN/Y2019/V55/I12/1544

Table 1 The compositions of different metallic glass plates measured by electron probe (atomic fraction / %)

Fig.1 OM images of No.B Zr55 metallic glass plate after 1~16 times laser remelting (The crystalline grains entrapped in the molten pool by convection are marked in Fig.1e)(a) 1 time (b) 3 times (c) 5 times (d) 7 times (e) 9 times (f) 11 times (g) 13 times (h) 15 times

Fig.2 OM images of No.C metallic glass plate after different times remelting(a) 1 time (b) 3 times (c) 7 times (d) 13 times

Fig.3 The microstructure evolutions of spherulitic crystallization during multiple laser remelting No.B Zr55 metallic glass plate(a) 1 time (b) 2 times (c) 3 times (d) 4 times (e) 8 times (f) 15 times

Fig.4 The microstructure evolutions of spherulitic crystallization during multiple laser remelting No.C metallic glass plate(a) 2 times (b) 3 times (c) 4 times (d) 6 times (e) 8 times (f) 10 times (g) 12 times (h) 15 times

Fig.5 Bright field TEM images of the remelting No.C Zr55 metallic glass plate (Insets are the corresponding SAED patterns)(a) Al₅Ni₃Zr₂ phase and amorphous phase (b) Cu₁₀Zr₇ phase and amorphous phase

Fig.6 SEM image of microstructure (a) and corresponding EPMA images of Al (b), Ni (c), Cu (d) and Zr (e) of crystallization at heat affected zone of No.A metallic glass

Fig.7 Nucleation variation during multiple laser remelting No.B and No.C metallic glass plates

Fig.8 Variation of spherulitic crystallization diameters during multiple laser remelting No.B and No.C metallic glass plates

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