Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys

Wang Xin; Liu Dong; Cheng Xu

doi:10.3788/CJL201845.0502004

Chinese Journal of Lasers, Volume. 45, Issue 5, 502004(2018)

Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys

Wang Xin^1,2, Liu Dong^1,2, and Cheng Xu^1,2、*

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¹[in Chinese]

²[in Chinese]

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Fig. 1. Schematic of laser additive manufacturing process

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Fig. 2. Schematic of specimen sampling

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Fig. 3. Schematic of heat treatment

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Fig. 4. Schematic of dimension of tensile specimen

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Fig. 5. Microstructure of as-deposited Al-Li alloy.(a) OM image; (b) XRD analysis result; (c) SEM image;(d) EDS analysis result

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Fig. 6. Microstructure of annealed Al-Li alloy. (a) OM image; (b) SEM image and EDS analysis result

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$Microstructure of quenched Al-Li alloy. (a) OM image; (b) SEM image; (c) TEM image; (d) diffraction spot$

Fig. 7. Microstructure of quenched Al-Li alloy. (a) OM image; (b) SEM image; (c) TEM image; (d) diffraction spot

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$Microstructure of aged Al-Li alloy. (a) TEM image; (b) diffraction spot; (c) TEM image; (d) square-phase high-resolution TEM image$

Fig. 8. Microstructure of aged Al-Li alloy. (a) TEM image; (b) diffraction spot; (c) TEM image; (d) square-phase high-resolution TEM image

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Table 1. Chemical compositions of Al-Li alloy powders and as-deposited plate (mass fraction, %)
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Table 1. Chemical compositions of Al-Li alloy powders and as-deposited plate (mass fraction, %)
Element Cu Li Mg Zn Mn Zr Fe Si K Na O Al
Powder 4.40 1.38 0.45 0.50 0.26 0.10 0.08 0.043 <0.002 <0.002 <0.003 Bal.
As-deposited plate 5.02 1.04 0.34 0.23 0.26 0.08 0.12 0.056 <0.002 <0.002 0.012 Bal.

Table 2. Performances of different Al-Li alloys under different conditions
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Table 2. Performances of different Al-Li alloys under different conditions
Material Microhardness /HV Tensilestrength /MPa Extensionstrength /MPa Elongation /%
Deposited Al-Li alloy 105 244 168 5.0
Al-Li alloy with aging state 155 458 429 5.0
Rolling 2A97 166 556 530 5.6

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Wang Xin, Liu Dong, Cheng Xu. Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys[J]. Chinese Journal of Lasers, 2018, 45(5): 502004

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