What is it about?
This work characterizes the changes in rolled microstructure of Al-Li 2060-T8 alloy resulted from friction stir welding and laser beam welding. The mechanical and fatigue properties of the base metal sheet in T8 temper were compared with that of the welded joints/zones. The results showed that the friction stir welding (FSW) joints and the laser beam welding (LBW) joints performed mechanically 24% and 22% lower than the base metal, respectively. The fatigue crack propagation rate was in the order of 3-5 times in FSW joints, and in the order of 2-3 times in LBW joints with respect to the base metal. From this study it was concluded that microstructure had played a key role in the mechanical properties as well as governed the fatigue properties of the alloy. The alternation in the superior work-hardened microstructure of the base metal caused a degradation in the properties.
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Why is it important?
Fatigue crack growth gate in 3rd generation Al-Li Alloys. This material is being used in aerospace industry to fabricate structural parts.
Perspectives
Effects of fusion and solid state welding on the fatigue properties of Al-Li 2060 alloy has been discussed.
Naveed Akhtar
Beihang University
Read the Original
This page is a summary of: Effects of microstructure alterations on fatigue crack propagation rate in Al-Li 2060-T8X alloy welded joints, January 2016, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/ibcast.2016.7429847.
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