铸轧Al-Si系镁合金组织性能的研究.pdfVIP

维普资讯 学兔兔 Ju1．2008 VOI．57 NO．7 ·647· ^ ^●，_～■ 0^^ ^^ ^● -^ 、 ^叮 ；新材料·新工艺 { ■ ’^■～‘●0 ，■ P ’n■、 ’0、 ● 一 铸轧AI—Si系镁合金组织性能的研究 李英虹，许光明，孙荣生，崔建忠 (东北大学材料电磁过程教育部重点试验室，辽宁沈阳l10004) 摘要：近终形双辊铸轧镁合金薄带是目前国内外研究的热点之一，本文中以AS系镁合金为研究对象，利用双辊铸轧 法成功铸轧出了厚度5mm的AS系镁合金板材，并研究了镁合金铸轧薄带组织和后续热轧工艺对镁合金板材组织性能的 影响。研究表明，As系镁合金铸轧薄带组织均匀，铸轧的亚共晶组织 (Mg．3％A1—0．75％Si)主要由细小的蔷薇状枝晶 组成；而．铸轧的共晶与过共晶组织 (Mg．5．52％A1—1．4％Si和Mg一6％A1．1．6％Si)主要由蔷薇状枝晶和等轴晶组成。热轧 后， 再结晶程度、晶粒细化效果和抗拉强度随压下量的增加而提高。 关键词：双辊铸轧；热变形；镁合金 中图分类号：TG292；TG304 文献标识码：A 文章编号：1001—4977(2008)07—0647—04 Microstructure and Properties of AI·Si Magnesium Alloy by Twin·Roll Casting LI Ying-hong，XU Guang-ming，SUN Rong-sheng，CUI Jian-zhong (Key Laboratory of Education Ministry for Electromagnetic Processing of Materials，Northeastern University，Shenyang 1 1 0004，Liaoning，China) Abstract： The AS magnesium alloy thin strip was produced successfully by using the strip rol1．casting process．Microstructure of the alloy and effect of succeeding hot rolI process on microstructure and properties of the magnesium alloy strip were studied．The results revealed that the micrOstructure Of AS magnesium alloy strip by twin-rolI casting was even；the hypoeutectic microstructure were mainly composed of fine rosaceous dendrite，and the eutectic and hypereutectic microstructures were mainly rosaceous dendrite and equiaxed grains．After hot roll，the extent of recrystallization，effect of grain refinement．as welI as tensile strength of materials al1 were improved w