Abstract
Second phase particles have a decisive role in strengthening 2219 aluminum alloy, so it is important to study its strengthening mechanism. The different characteristics of the second phase particles of 2219 aluminum alloy were summarized, and the strengthening mechanism of deformable second phase particles (strain strengthening, chemical strengthening, order strengthening, modulus strengthening) and non-deformable second phase particles was analyzed. The strengthening mechanism model was established, the main application of the two particles was explained, and the guiding significance of the second phase particles on the coarse residual crystal phase breaking and the grain microstructure refinement of aluminum alloy was pointed out.
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