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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
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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:  Zr55Cu30Al10Ni5 metallic 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)
Corresponding Authors:  Xin LIN     E-mail:  xlin@nwpu.edu.cn

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

Sample No.AlNiCuZr
A8.936.1629.8055.11
B7.795.2229.5857.42
C9.695.4732.4352.40
D8.549.1424.1358.19
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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