研究目的
Investigating the effects of laser beam welding and post-weld heat treatment on the phase composition and mechanical properties of the 1424 alloy (Al–Mg–Li) joints.
研究成果
The study successfully optimized the heat treatment conditions for laser-welded joints of the 1424 Al–Mg–Li alloy, achieving a weld strength of σUTS = 500 MPa, which is comparable to the base alloy. The formation of the δ′(Al3Li) strengthening phase in the weld joint was crucial for this achievement. The research provides valuable insights into the phase transformations and mechanical properties of Al–Mg–Li alloy joints under different heat treatment conditions.
研究不足
The study focused on the 1424 Al–Mg–Li alloy and specific welding and heat treatment conditions. The findings may not be directly applicable to other alloys or treatment parameters.
1：Experimental Design and Method Selection:
The study involved laser beam welding of butt joints on an ALTC Sibir-1 facility, followed by heat treatment in a Carbolite chamber furnace. The specimens were heated to various temperatures, held, and then quenched in cold water. Artificial aging was carried out at different temperatures and times.
2：Sample Selection and Data Sources:
The chemical composition of the 1424 Al–Mg–Li alloy was provided, and specimens were prepared with dimensions of 100 mm × 50 mm × 1.5 mm.
3：5 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included an ALTC Sibir-1 facility for laser welding, a Carbolite chamber furnace for heat treatment, a Zwick/Roell Z100 electromechanical testing machine for strength measurement, an Olympus LEXT OLS3000 optical microscope, a MERLIN Compact scanning electron microscope (Carl Zeiss, Germany), and a D8 Advance diffractometer for XRD.
4：Experimental Procedures and Operational Workflow:
Welding was performed at a laser power of 2.7 kW and a speed of 4 m/min. Heat treatment involved heating to temperatures between 450 °C and 560 °C, holding for 30 min, quenching, and artificial aging at temperatures from 120 °C to 175 °C for 4 to 16 h.
5：7 kW and a speed of 4 m/min. Heat treatment involved heating to temperatures between 450 °C and 560 °C, holding for 30 min, quenching, and artificial aging at temperatures from 120 °C to 175 °C for 4 to 16 h.
Data Analysis Methods:
5. Data Analysis Methods: The microstructure was examined using optical and scanning electron microscopy. Elemental analysis was performed using energy-dispersive spectroscopy. Phase analysis was conducted using powder X-ray diffraction and synchrotron radiation diffractometry.
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