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Flat hardness distribution in AA6061 joints by linear friction welding
Jeong-Won Choi1, Weihao Li1, Kohsaku Ushioda1
1Joining and Welding Research Institute, Osaka University, Osaka, Ibaraki, 567-0047, Japan.
Scientific Reports
|June 4, 2021
Summary
Linear friction welding (LFW) prevents softening in precipitation-strengthened aluminum alloys by controlling temperature and increasing shear strain. This method achieves uniform hardness, enhancing mechanical properties for high-performance aluminum joints.
Area of Science:
- Materials Science
- Metallurgical Engineering
- Joining Technologies
Background:
- Conventional welding of precipitation-strengthened aluminum alloys often leads to softening regions.
- This softening deteriorates the mechanical properties of the aluminum joints.
Purpose of the Study:
- To investigate the effectiveness of linear friction welding (LFW) in suppressing softening regions in precipitation-strengthened aluminum alloys.
- To demonstrate a method for achieving uniform hardness distribution and high-performance aluminum joints.
Main Methods:
- Utilized linear friction welding (LFW) on AA6061-T6 aluminum alloy.
- Controlled interfacial temperature and introduced large shear strain during the LFW process.
- Varied applied pressure from 50 to 240 MPa to observe its effect on interfacial temperature.
Main Results:
- LFW completely suppressed softening regions in the AA6061-T6 alloy.
- An extremely low interfacial temperature was achieved, decreasing with increased pressure.
- Both softening and hardening regions were suppressed, resulting in uniform hardness distribution.
Conclusions:
- High-pressure LFW is an effective method to prevent softening in precipitation-strengthened aluminum alloys.
- This technique offers guidance for creating high-performance aluminum alloy joints.
- The LFW approach can be extended to other precipitation-strengthened aluminum alloys susceptible to high-temperature softening.
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