中文摘要：

采用多向锻造实验的方法研究了末道次锻造温度为340℃的条件下锻造道次对5182铝合金宏微观组织的影响.研究结果表明：多向锻造过程中随锻造道次由3增至12,心部细晶区的面积不断扩大,锻造道次增至12次并未消除因累计变形量不同而导致的心部与边部的组织差异.锻造道次由3增至12的过程中,试样锤头附近的组织不断破碎变细,但未发生明显的再结晶.试样心部的变形组织在经3道次锻造后开始发生部分再结晶;经6道次锻造后试样心部发生完全再结晶,试样再经9,12道次锻造后心部均发生完全再结晶,且晶粒尺寸较锻6次试样略有增加.5182铝合金试样心部再结晶晶粒尺寸随锻造道次的累计增加会达到一个细化极限值.

英文摘要：

Macro- and micro-structure evolution of 5182 aluminum alloy was studied in multidirectional forging（ MDF） with the final forging temperatures of 340 ℃. The results showed that the fine grain zone in the center of sample expands gradually with the increment of the forging passes from 3 to 12. But increasing the forging pass to 12 can not eliminate the structure difference between the center and peripheral area. The structure of area near the forging harmers is constantly destroyed（ but no distinct recrystallization occurs in the structure） with the forging pass increases from 3 to 12. When the forging pass is 3,partial recrystallization occurs on the center area of the sample. When the forging pass reaches 6,a fully recrystallization occurs in the center area of the sample,and the finest recrystallization grains are observed. With the forging pass further increases to 9 and 12,the recrystallization grains are a little coarser than that forged by 6 passes. However,the grains in the center area of the samples forged by 9 and 12 passes showthe almost same size.So there is a grain refinement limitation in the center of sample with the increment of the forging passes.