Study On The Configuration Control Of Dispersoid And The Strain Hardening Behavior Of3104Aluminum Alloy

3104aluminum alloy has been applied broad in the body of aluminum can for its high ductility, corrosion resistance and deep drawing properties. Studies report that there exist quantities of second-phase particles like crystalline phases and dispersoids, and the configuration of these phases have great impact on the behavior of recrystallization, strength, formability. However, at present, the effect of second phase particles configuration, particularly dispersed phase configuration, on the behavior of recrystallization and strain hardening is rarely studied. In this paper, as the first step, we adjust the configuration of dispersed phase particles by two-stage homogenization, then we mainly research the effect of dispersed phase particles configuration, including size, amount and distribution of particles, on the size, orientation of grain and strain hardening behavior after recrystallizing, which would lay the foundation for getting a better knowledge of the effect of dispersed phase particles configuration on the behavior of recrystallization and plastic flow in aluminum alloys. The study results are shown as follows:(1) During the two-step homogenization, including low temperature pretreatment (200℃～450℃×4h-24h) and high temperature homogenization(590℃×12h), with the increase of pretreatment temperature, the amount of Mg2Si phases in3104aluminum semi-continuous ignot becomes more at first then becomes less, and the size of Mg2Si changes from small to big.(2) After the two-step homogenization(250℃～400℃×12h+590℃×24h) and rolling, solution treatment(590℃×15min) and annealing treatment(450℃×1h) are carried out on the3104aluminum alloy sheet. Then we find out that with the increase of first step homogenization temperature, the amount of dispersed phase particles increase gradually, and the grain size of recrystallization decreases a little, furthermore, the yield strength and tensile strength decrease while elongation increases.(3) After the two-step homogenzation(350℃×8h～24h+590℃×24h) and rolling, solution treatment(590℃×15min) and annealing treatment(450℃×1h) are carried out on the3104aluminum alloy sheet. In this part, the amount of dispersed phase particles become less at first, then become more with the pretreatment time being prolonged, additionally, the grain size of homogenization decreases after a stage of increasing and yield strength and tensile strength have a same trend with that of grain size while the trend of elongation is opposite.(4) Both continuous strain hardening exponent (nc) and instantaneous strain hardening exponent (ns) increase at first and decrease after that. Instantaneous strain hardening exponent (ns) reaches maximum when strain is2%and continuous strain hardening exponent(nc) reaches maximum when strain is3%. But the decreasing trend of continuous strain hardening exponent(nc) is more mild than that of instantaneous strain hardening exponent (ns).