Abstract
Five kinds of ultra fine aluminum powder (UFAP) are sintered and hot rolled in the same conditions. The relations among stress/strain curves, compositions, and texture of the sintered (and rolled) specimens (SUFAP=sintered ultra-fine aluminum products) are examined. SUFAP-A show marked superplastic strain in the temperature range from 373 to 573 K. Maximum fracture strains of SUFAP-A, B, C and D increase, as the Cu content in UFAP (or SUFAP) becomes higher. SUFAP can be explained to be SAP/UFAP composites, where SAP (sintered aluminum powder) appears in lenticular striations by grain growth of UFAP in the processes of sintering and hot rolling. The grain growth is suppressed with an increase of the Cu concentration. Consequently, the maximum fracture strains increase linearly with the spacing of the striations.
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