研究目的
Investigating the effect of thermomechanical processing on the laser weld joint of high-strength aluminum-lithium alloys to produce a high-strength weld joint.
研究成果
The proposed approach including laser welding in optimal mode and heat treatment allowed obtaining fixed joints with strength close to the strength of the alloy. The mechanical properties of samples can be managed by heat treatment modes, creating a sample with a strength higher than the strength of at-delivery material. The fundamental difference of examined alloys depends on the behavior of base alloying elements.
研究不足
The strength of welded joints of Al-Li alloys obtained by laser beam welding is still rather low for mass implementation of this technology in the aerospace engineering. The optimization of welding modes and addition should be used to minimize negative effects.
1：Experimental Design and Method Selection:
Laser beam welding of aluminum alloys followed by thermal processing (quenching, artificial ageing).
2：Sample Selection and Data Sources:
Aluminum-lithium alloys 1424 (Al-Mg-Li) and V1469 (Al-Cu-Li).
3：List of Experimental Equipment and Materials:
Sibir-1 automated laser technological complex, CO2 laser, ZnSe lens, helium for protection, Olympus LEXT OLS3000 optical microscope, LEO 1430 VPI scanning electron microscope, Carbolite batch furnace, Presi sample preparation machines, Micromet 5114 microhardness tester, Zwick/Roell Z100 electromechanical test machine, D8 ADVANCE diffractometer.
4：Experimental Procedures and Operational Workflow:
Welding in optimal mode, post-treatment including quenching and artificial ageing, microstructure and phase composition analysis, mechanical properties measurement.
5：Data Analysis Methods:
Microhardness measurement, tensile strength testing, X-ray diffraction for phase analysis.
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Olympus LEXT OLS3000 optical microscope
LEXT OLS3000
Olympus
Studying the macrostructure and microstructure of the welded joints
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Sibir-1 automated laser technological complex
Laser beam welding of aluminum alloys
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CO2 laser
Providing laser beam for welding
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ZnSe lens
Focusing the laser beam on the alloy surface
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LEO 1430 VPI scanning electron microscope
LEO 1430 VPI
Spectral analysis of the welded joint and base alloy
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Carbolite batch furnace
Carbolite
Heat treatment of the samples
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Presi sample preparation machines
Presi
Cutting and polishing samples for preparation
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Micromet 5114 microhardness tester
5114
Micromet
Measuring microhardness by indentation
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Zwick/Roell Z100 electromechanical test machine
Z100
Zwick/Roell
Measuring the strength of the welded joints and base alloys under static tension
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D8 ADVANCE diffractometer
D8 ADVANCE
Bruker AXS
Recording X-ray diffraction patterns for studying structural-phase states
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