材料研究学报  2010, Vol. 24 Issue (5): 513-454

研究论文 本期目录 | 过刊浏览 |

工艺条件对Mg-3Sn-Mn合金连续流变成形组织的影响机理

赵占勇, 管仁国,  曹富荣, 崔彤, 黄红乾

东北大学材料与冶金学院 沈阳 110004

Effects of Process Conditions on the Microstructure of Mg--3Sn--Mn Alloy During Continuous Rheo--forming Process

ZHAO Zhanyong, GUAN Renguo, CAO Furong, CUI Tong, HUANG Hongqian

School of Materials and Metallurgy, Northeastern University, Shenyang 110004

赵占勇 管仁国 曹富荣 崔彤 黄红乾. 工艺条件对Mg-3Sn-Mn合金连续流变成形组织的影响机理[J]. 材料研究学报, 2010, 24(5): 513-454.
, . Effects of Process Conditions on the Microstructure of Mg--3Sn--Mn Alloy During Continuous Rheo--forming Process[J]. Chin J Mater Res, 2010, 24(5): 513-454.

摘要 参考文献 相关文章 Metrics 全文: PDF(1167 KB)   摘要: 制备Mg--3Sn--Mn合金型材, 研究了连续流变成形工艺条件对制品组织的影响机理。结果表明: 当轧辊转速一定而合金浇注温度在690--750℃变化时, 随着浇注温度的降低, 结晶前沿的成分过冷度增大, 合金中心固相率增加, 从而使制品边部柱状晶区增大, 中心等轴晶区减小, 等轴晶区的晶粒平均直径减小。当合金浇注温度一定, 二轧辊转速在0.052--0.087 m · s -1变化时, 随着轧辊转速的减小凝固界面趋于稳定, 合金在辊靴型腔中随剪切时间的增加制品边部柱状晶区减小, 中心等轴晶区增大。浇注温度为690℃、轧辊转速为0.052 m · s-1时制备的断面为5 mm x 50 mm的镁合金型材,其表面质量和组织良好, 制品晶粒平均直径为27 μm。 关键词 ： 材料合成与加工工艺 ,   连续流变成形 ,   镁合金 ,   ,  工艺条件 ,   组织 ,   机理     Abstract：Mg–3Sn–Mn alloy profiles have been successfully manufactured by the continuous rheo–forming equipment self–designed, and the effects of process conditions on the microstructures of the products were investigated. The results show that when the roll is at a certain speed and the casting temperature varies from 690oC  to 750oC with the decrease of casting temperature, the composition supercooling in front of solid–liquid interface and the solid fraction in the center increase, so, the width of columnar grain zone near the edge of the product increases, the equiaxed grain zone in the central position decreases, and the average diameter of grains in the equiaxed grain zone decreases. When casting temperature is kept constant and roll speed varies from 0.052 m·s−1 to 0.087 m·s−1, with the decrease of roll speed, the solid–liquid interface tends to be stable and the melt is subjected to the shear in the roller–shoe cavity for a long time, so, the width of columnar grain zone near the edge of the product decreases and the width of equiaxed grain zone in the central position increases. When the casting temperature is 690oC  and roll speed is 0.052 m·s−1, magnesium alloy profiles with cross–section of 5 mm×50 mm have been obtained, the surface and microstructure of the products are excellent, and the average grain size of the product is 27 μm. Key words： synthesizing and processing technics    continuous rheo--forming     magnesium alloy    procedure conditions    microstructure    mechanism 收稿日期: 2010-06-21      ZTFLH:  TG244   基金资助: 国家自然科学基金50974038、51034002,中央高校基本科研业务费N090502003, 国家高技术研究发展计划2007AA03Z111和教育部新世纪优秀人才支持计划NCET--08--0097资助项目。 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 赵占勇 管仁国 44.8K 链接本文: https://www.cjmr.org/CN/      或      https://www.cjmr.org/CN/Y2010/V24/I5/513 [1]R.F.DECKER.The renaissance in magnesium.Advanced Material & Process,1998,157(9):31- [2]YU Kun, LI Wenxian, WANG Richu, MA Zhengqing, Research.development and application of wrought magnesium alloys.The Chinese Journal of Nonferrous Metals,2003,13(2):277- [3]余琨, 黎文献, 王日初, 马正青.变形镁合金的研究、开发及应用.中国有色金属学报,2003,13(2):277- [4]A.YAMASHITA, Z.HORITA, T.G.Improving the mechanical properties of magnesium and a magnesium alloy through severe plastic deformation.Mat. Sci. 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