Abstract
ABSTRACTThe combined effects of ultrasonic treatment and fast cooling on the bulk hydrogen content, the refinement of α-Al grains and θ-Al2Cu precipitated phase in the 2219 Al alloy were investigated in this work. Results showed that under the combined effects of ultrasonic treatment and liquid nitrogen cooling, the bulk hydrogen content was dramatically reduced. Metallography and scanning electron microscopy results indicated that both the α-Al grains and θ-Al2Cu precipitated phase were greatly refined under the combined effects of ultrasonic treatment and liquid nitrogen cooling. Correspondingly, the 2219 Al alloy sample exhibited excellent mechanical properties due to the refinement of α-Al grains and θ-Al2Cu precipitated phase as well as the low bulk hydrogen content.
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