Abstract
High strain rate superplastic behaviors on Al-Si sintered preforms were investigated. These materials were processed by hot compaction of rapidly solidified powder at low temperature (<773K), followed by no additional thermal-mechanical treatment, resulting in a extremely fine-grained structure. Such sintered preforms were confirmed to exhibit the high strain rate superplasticty (over 10 2 ∼10°/s) by the compression tests at temperature around 800K, and this suggests the possibility of production for Al-Si P/M components by superplastic deformation with industrial production speed. It was also confirmed that higher content of transition metals in Al-Si alloys was effective to maintain a fine-grained structure and to enhance the high strain superplastic behavior.
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