中文摘要：

6061 铝合金的半固体营舍被 near-liquidus 准备半连续的扔(最低有效字符) 与插座或 near-spheroide 谷物。处理的变丑前在部分 remelting 前被使用进一步改进半固体合金的微观结构和性质。不同处理参数的效果例如保持温度和成立时间，在部分 remelting 期间在半固体微观结构上被调查了。最佳的部分 remelting 参数应该是为 6061 合金寒冷的 5 min 在变丑前的高度与 60% 减小卷了的 630 掳 C 和 10 鈥 ? ，这被发现。变粗的率是由 Lifshitz-Slyozov-Wagner (LSW ) 理论的 anasysed。预先使变形 6061 合金展览比当演员组那的降低变粗的率常数，并且也比在以前的文学发现的不同方法处理的另外的合金降低。它是因为变粗的率与合金的起始的微观结构和作文被联系。在合金的第二等的阶段禁止液体电影谷物边界的迁居。微观结构获得了由没有变丑前处理，用 near-liquidus 的联合，半连续的扔和变丑前处理比那好，它证明使用的方法为制作高质量的半固体合金是有希望的。

英文摘要：

The semi-solid billet of 6061 aluminum alloy was prepared by the near-liquidus semi-continuous casting（LSC） with rosette or near-spheroide grains.The pre-deformation processing was applied before partial remelting to further improve the microstructure and properties of the semi-solid alloy.The effects of different processing parameters,such as holding temperature and holding time,on the semisolid microstructures during partial remelting have been investigated.It was found that the optimal partial remelting parameters should be 630℃ and 10-15 min for 6061 alloy cold rolled with 60% reduction in height of pre-deformation.The coarsening rates were anasysed by Lifshitz-Slyozov-Wagner（LSW） theory.The pre-deformed 6061 alloy exhibits lower coarsening rate constants than that of the as-cast one,and also lower than other alloys processed by different method found in previous literature.It is because the coarsening rate is associated with the initial microstructure and composition of the alloy.The secondary phases in the alloy inhibit the migration of the liquid film grain boundaries.The microstructure obtained by using the combination of near-liquidus semicontinuous casting and pre-deformation treatment is better than that without pre-deformation processing,which demonstrates that the used method is promising for fabricating high quality semi-solid alloys.