芯棒根数对Mg MB26/Al 7075双金属包覆挤压棒材组织及性能的影响
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摘要
利用包覆挤压方法成功制备了不同芯棒根数(一根、三根、五根)的Mg MB26/Al 7075双金属复合棒材。重点研究了不同芯部根数对Mg/Al双金属复合材料的微观组织及界面质量的影响,同时对不同芯棒根数Mg/Al复合材料的力学性能进行了分析对比。结果表明,采用320℃挤压温度、25的挤压比制备的不同芯棒根数Mg/Al复合棒材,五芯芯部、边部晶粒细化及均匀化程度较三芯效果更佳,即多芯结构界面表面积这一因素对晶粒细化及均匀度的影响较完全轴对称这一力学因素影响更加明显。随着蕊棒数目的增加,界面层厚度略有减小且近镁层厚度减小较为明显;屈服强度变化差距不大、有轻微的增大趋势。
Mg MB26/Al 7075 bimetal composite mandrels with different number of mandrels(one,three,and five)were successfully prapared by coating extrusion method.The effects of different number of mandrels on the microstructure and the interface quality were studied.The mechanical properties of Mg/Al composites with different mandrels were analyzed and compared.The results show that under the condition of extrusion temperature of 320℃and extrusion ratio of 25,Mg/Al composite with different bimetals are produced.The grain refinement and homogenization degree of the five-core's core and edge are better than the three-core's,that is,the influence of the interface surface area of the multi-core structure on the grain refinement and uniformity are more obvious than the mechanical factor of the complete axial symmetry.As the number of mandrels increases,the thickness of the interface layer decreases slightly,especially,the decrease in the thickness of the near-magnesium layer is more obvious.The yield strength varies little and has a slight increase trend.
Mg MB26/Al 7075 bimetal composite mandrels with different number of mandrels(one,three,and five)were successfully prapared by coating extrusion method.The effects of different number of mandrels on the microstructure and the interface quality were studied.The mechanical properties of Mg/Al composites with different mandrels were analyzed and compared.The results show that under the condition of extrusion temperature of 320℃and extrusion ratio of 25,Mg/Al composite with different bimetals are produced.The grain refinement and homogenization degree of the five-core's core and edge are better than the three-core's,that is,the influence of the interface surface area of the multi-core structure on the grain refinement and uniformity are more obvious than the mechanical factor of the complete axial symmetry.As the number of mandrels increases,the thickness of the interface layer decreases slightly,especially,the decrease in the thickness of the near-magnesium layer is more obvious.The yield strength varies little and has a slight increase trend.
引文
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[19]HONG S G,PARK S H,CHONG S L.Role of{1012}twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy[J].Acta Materialia,2010,58(18):5873-5885.
[2]HOMMA T,KUNITO N,KAMADO S.Fabrication of extraordinary high-strength magnesium alloy by hot extrusion[J].Scripta Materialia,2009,61(6):644-7.
[3]HIRSCH J,AL-SAMMAN T.Superior light metals by texture engineering:Optimized aluminum and magnesium alloys for automotive applications[J].Acta Materialia,2013,61(3):818-43.
[4]WILLIAMS J C,JR E A S.Progress in structural materials for aerospace systems[J].Acta Materialia,2003,51(19):5775-5799.
[5]张蕊,周涛,张驰,等.不同挤压比下Mg/Al双金属界面的微观组织与力学性能研究[J].热加工工艺,2018(7):9-25.ZHANG Rui,ZHOU Tao,ZHANG Chi,et al.Microstructure and mechanical properties of Mg/Al bimetallic interface at different extrusion ratios[J].Hot Processing Technology,2018(7):9-25.
[6]冯波.Mg/Al复合棒材制备及其力学行为研究[D].重庆:重庆大学,2016:37-51.FENG Bo.Preparation and mechanical behavior of Mg/Al composite bar[D].Chongqing:chongqing university,2016:37-51.
[7]吴洋.利用挤压制备镁/铝合金复合板材的组织与性能研究[D].重庆:重庆大学,2016:28-38+46-56.WU Yang.Microstructure and properties of extruded magnesium/aluminum alloy composite plates[D].Chongqing:Chongqing university,2016:28-38,46-56.
[8]洪睿.利用挤压加工制备铝包镁复合板材研究[D].重庆:重庆大学,2015:34-52.HONG Rui.Research on the preparation of aluminiummagnesium-coated composite plates by extrusion processing[D].Chongqing:Chongqing university,2015:34-52.
[9]APPERLEY M H,SORRELL C C,CROSKY A.The co-extrusion of metal-sheathed high-temperature superconductors[J].Journal of Materials Processing Technology,2000,102(1/3):193-202.
[10]BERSKI S,DYJA H,MARANDA A,et al.Analysis of quality of bimetallic rod after extrusion process[J].Journal of Materials Processing Technology,2006,177(1/3):582-588.
[11]PARAMSOTHY M,GUPTA M,SRIKANTH N.Improving compressive failure strain and work of fracture of magnesium by integrating it with millimeter length scale aluminum[J].Journal of Composite Materials,2008,42(13):1297-307.
[12]LEE S,WADSWORTH J,SHERBY O D.Tensile properties of laminated composites based on ultrahigh carbon steel[J].Journal of Composite Materials,2010,25(7):842-53.
[13]HAWKINS R,WRIGHT J C.Observations on the deformation properties of sandwich materials[J].International Journal of Mechanical Sciences,1972,14(12):875-8.
[14]聂书才.铝镁合金包覆挤压关键技术研究[D].兰州:兰州理工大学,2014:36-50.NIE Shucai.Research on key technologies of aluminum magnesium alloy cladding extrusion[D].Lanzhou:Lanzhou university of technology,2014:36-50.
[15]PARAMSOTHY M,GUPTA M,SRIKANTH N.Processing,microstructure,and properties of a Mg/Al bimetal macrocomposite[J].Journal of Composite Materials,2008,42(24):2567-84.
[16]黄光胜.镁合金成形性能的改善及热变形行为研究[D].重庆:重庆大学,2003:81-89.HUANG Guangsheng.Improvement of magnesium alloy formability and thermal deformation behavior[D].Chongqing:Chongqing university,2003:81-89.
[17]ZHAO Y H,LIAO X Z,JIN Z,et al.Microstructures and mechanical properties of ultrafine grained 7075 Al alloy processed by ECAP and their evolutions during annealing[J].Acta Materialia,2004,52(15):4589-99.
[18]周熙.镁合金与铝合金热轧复合的基础研究[D].南京:南京理工大学,2008:54-70.ZHOU Xi.Basic research on hot-rolled composites of magnesium alloy and aluminum alloy[D].Nanjing:Nanjing University of Science and Technology,2008:54-70.
[19]HONG S G,PARK S H,CHONG S L.Role of{1012}twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy[J].Acta Materialia,2010,58(18):5873-5885.