Study on Process Parameters for Preparing a High-Strength Al-Mg-Sc-Zr Alloy by Laser Melting Deposition

Jian Zou; Hongjun Liu; Yuhui Zhao; Jibin Zhao; Chen He; Zhiguo Wang

doi:10.3788/LOP220625

Laser & Optoelectronics Progress, Volume. 60, Issue 9, 0914003(2023)

Study on Process Parameters for Preparing a High-Strength Al-Mg-Sc-Zr Alloy by Laser Melting Deposition

Jian Zou^1,2, Hongjun Liu¹, Yuhui Zhao^2,3、*, Jibin Zhao^2,3, Chen He^2,3, and Zhiguo Wang^2,3

Author Affiliations

¹College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 110135, Liaoning, China

²Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

³Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, Liaoning, China

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Figures & Tables(13)

Fig. 1. Laser melting deposition additive manufacturing system

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Fig. 2. Sampling position and size of deposited sample and tensile sample. (a) Deposited samples; (b) sampling position of tensile specimen; (c) tensile specimen size

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Fig. 3. Microstructure and defect images of deposited samples with different conditions. (a) Pore defect; (b) lack of fusion defect

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Fig. 4. Effect of process parameters on the density of Al-Mg-Sc-Zr alloy

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$Mass fraction statistics of main element of alloy under different processes$

Fig. 5. Mass fraction statistics of main element of alloy under different processes

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Fig. 6. SEM images of deposited samples with different energy densities. (a) (e) 50 J/mm²; (b) (f) 75 J/mm²; (c) (g) 100 J/mm²; (d) (h) 150 J/mm²

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Fig. 7. Map scanning and EDS analysis of Sc/Zr rich phase

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Fig. 8. Effect of process parameters on the hardness of deposited Al-Mg-Sc-Zr alloy

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Fig. 9. Stress-strain curve and performance comparison of deposited samples. (a) (b) Tensile specimen, powder feeding rate of 2.5 g/min, energy density of 100 J/mm²; (c) strength and elongation; (d) 2.5 g/min; (e) 4.5 g/min; (f) 5.5 g/min

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Fig. 10. Fracture morphology of specimen at 2.5 g/min powder feeding rate with different energy densities. (a) 50 J/mm²; (b) 75 J/mm²; (c) 100 J/mm²; (d) 150 J/mm²

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Table 1. Chemical composition of Al-Mg-Sc-Zr alloy powder and substrate
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Table 1. Chemical composition of Al-Mg-Sc-Zr alloy powder and substrate
Material Mass fraction /%
Mg Sc Zr Mn Zn Cu Fe Si Al
Powder 5.87 1.01 0.37 0.54 0.3 0.01 0.1 0.0360 Bal.
Substrate 4.64 0.76 0.27 0.54 0.2 0.01 0.1 0.0028 Bal.

Table 2. Process parameters of deposited samples under different conditions

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Table 2. Process parameters of deposited samples under different conditions

Parameter	Number
Parameter	1#	2#	3#	4#	5#	6#	7#	8#	9#	10#	11#	12#
Powder feeding rate /（g·min^-1）	2.5	2.5	2.5	2.5	4.5	4.5	4.5	4.5	5.5	5.5	5.5	5.5
Energy density /（J·mm^-2）	150	100	75	50	150	100	75	50	150	100	75	50
Laser power /kW	3	3	3	2	3	3	3	2	3	3	3	2
Scan rate /（mm·s^-1）	5	7.5	10	10	5	7.5	10	10	5	7.5	10	10

Table 3. Statistics of average grain size
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Table 3. Statistics of average grain size
Energy density /（J·mm^-2） 50 75 100 150
Average diameter of single grain /μm 6.628 7.331 7.646 13.801

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Jian Zou, Hongjun Liu, Yuhui Zhao, Jibin Zhao, Chen He, Zhiguo Wang. Study on Process Parameters for Preparing a High-Strength Al-Mg-Sc-Zr Alloy by Laser Melting Deposition[J]. Laser & Optoelectronics Progress, 2023, 60(9): 0914003

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