6061变形铝合金自孕育流变压铸过程中的凝固行为（英文）
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摘要
采用自孕育法制备6061变形铝合金半固态浆料,研究保温参数对自孕育流变压铸过程中凝固组织的影响,并结合OM、SEM、EDS及EBSD进一步分析流变压铸过程中的凝固行为。结果表明,保温过程只影响初生α(Al)颗粒,而对6061合金薄壁件压铸过程中剩余液相的凝固组织影响不大。流变压铸过程中,型腔提供的较大冷却速率使剩余液相爆发形核,并经过稳定生长、失稳生长以及合并长大阶段最终形成二次凝固颗粒(α_2)。由于二次凝固过程中已经存在一次颗粒,剩余液相的溶质浓度较一次颗粒的高;因此,二次颗粒中Mg元素和Si元素的含量比一次颗粒中的高。
The semisolid slurry of the 6061 wrought aluminum alloy was prepared by the self-inoculation method(SIM). The effects of the isothermal holding parameters on microstructures of rheo-diecastings were investigated, and the solidification behavior of 6061 wrought aluminum alloy during the rheo-diecasting process was analyzed using OM, SEM, EDS and EBSD. The results indicate that the isothermal holding process during slurry preparation has great effect on primary α(Al) particles(α_1), but has little effect on the microstructure of secondary solidification in the process of thin-walled rheo-diecasting. Nucleation is expected to take place in the entire remaining liquid when the remaining liquid fills the die cavity, and the secondary solidification particles(α_2) are formed after the process of stable growth, unstable growth and merging. The solute concentration of remaining liquid is higher than that of the original alloy due to the existence of α_1 particles, hence the contents of Mg and Si in α_2 particles are higher than those in α_1 particles.
The semisolid slurry of the 6061 wrought aluminum alloy was prepared by the self-inoculation method(SIM). The effects of the isothermal holding parameters on microstructures of rheo-diecastings were investigated, and the solidification behavior of 6061 wrought aluminum alloy during the rheo-diecasting process was analyzed using OM, SEM, EDS and EBSD. The results indicate that the isothermal holding process during slurry preparation has great effect on primary α(Al) particles(α_1), but has little effect on the microstructure of secondary solidification in the process of thin-walled rheo-diecasting. Nucleation is expected to take place in the entire remaining liquid when the remaining liquid fills the die cavity, and the secondary solidification particles(α_2) are formed after the process of stable growth, unstable growth and merging. The solute concentration of remaining liquid is higher than that of the original alloy due to the existence of α_1 particles, hence the contents of Mg and Si in α_2 particles are higher than those in α_1 particles.
引文
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[2]CHEN Zhen-hua.Wrought magnesium alloy[M].Beijing:Chemical Industry Press,2005.(in Chinese)
[3]PAN Fu-sheng,ZHANG Ding-fei.Aluminum alloy and its application[M].Beijing:Chemical Industry Press,2006.(in Chinese)
[4]WU Gong,YAO Liang-jun,LI Zheng-xia,PENG Ru-qing,ZHAO Zu-de.Handbook of aluminium and aluminium alloys[M].Beijing:Science Press,1994.(in Chinese)
[5]QI Pei-xiang.Squeezing casting for wrought aluminum alloy[J].Special Casting and Nonferrous Alloy,2008,28(10):769-772.(in Chinese)
[6]HU K,PHILLION A B,MAIJER D M,COCKCROFT S L.Constitutive behavior of as-cast magnesium alloy Mg-Al3-Zn1 in the semi-solid state[J].Scripta,2009,60(6):427-430.
[7]KIM S K,YOON Y Y,JO H H.Novel thixoextrusion process for Al wrought alloys[J].Journal of Materials Processing Technology,2007,187-188(12):354-357.
[8]FLEMINGS M C.Behavior of metal alloys in the semi-solid state[J].Metallurgical and Materials Transactions B,1991,22(5):957-981.
[9]LUO Shou-jing,JIANG Yong-zheng,LI Yuan-fa,SHAN Wei-wei.Recognition of semi-solid metal forming technologies[J].Special Casting and Nonferrous Alloy,2012,32(7):603-607.(in Chinese)
[10]ESKIN D G,KATGERMAN S L.Mechanical properties in the semi-solid state and hot tearing of aluminum alloys[J].Progress in Materials Science,2004,49(5):629-711.
[11]XU Jun,ZHANG Zhi-feng.Research progress of semisolid processing technology[J].Journal of Harbin University of Science and Technology,2013,18(2):1-6.(in Chinese)
[12]ZHAO Jun-wen,WU Shu-sen.Microstructure and mechanical properties of rheo-diecast A390 alloy[J].Transactions of Nonferrous Metals Society of China,2010,20(S3):s754-s757.
[13]WANG Zhi-bo,LIU Chang-ming,HAN Zhao-tang.Structure evolution characteristics of wrought aluminum alloy 7050 in the process of semi-solid forging and its mechanical properties[J].Aluminum Fabrication,2008(1):16-20.(in Chinese).
[14]LU Gui-min,DONG Jie,CUI Jian-zhong,WANG Ping.Study on the reheating and thixoforming of 7075 aluminum alloy cast by liquidus semi-continuous casting[J].Acta Metallurgica Sinica,2001,31(11):1184-1188.
[15]WANG Shun-cheng,LI Yuan-yuan,CHEN Wei-ping,ZHENG Xiao-ping.Microstructure evolution of semi-solid 2024 alloy during two-step reheating process[J].Transactions of Nonferrous Metals Society of China,2008,18(4):784-788.
[16]LI Yan-lei,LI Yuan-dong,LI Chun,WU Hui-hui.Microstructure characteristics and solidification behavior of wrought aluminum alloy 2024 rheo-diecast with self-inoculation method[J].China Foundry,2012,9(4):328-336.
[17]ZHAO Zhan-yong,GUAN Ren-guo,WANG Xiang,LI Yang,DONG Lei,LEE C S,LIU Chun-ming.Microstructure formation mechanism and properties of AZ61 alloy processed by melt treatment with vibrating cooling slope and semisolid rolling[J].Metals and Materials International,2013,19(5):1063-1067.
[18]JIN C K,BOLOURI A,KANG C G.Mechanical properties and microstructure of thin plates of A6061 wrought aluminum alloy using rheology forging process with electromagnetic stirring[J].Metallurgical and Materials Transactions B,2013,45(3):1068-1080.
[19]CURLE U A.Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2010,20(9):1719-1724.
[20]LI Yuan-dong,YANG Jian,MA Ying,QU Jun-feng,ZHANG Peng.Effect of pouring temperature on AM60 Mg alloy semi-solid slurry prepared by self-inoculation method(I)[J].Transactions of Nonferrous Metals Society of China,2010,20(6):1046-1052.
[21]LOUE W R,SUERY M.Microstructural evolution during partial remelting of Al2Si7Mg alloys[J].Materials Science and Engineering A,1995,203(1-2):1-13.
[22]VOORHEES P W,HARDY S C.Ostwald ripening in a system with a high volume fraction of coarsening phase[J].Metallurgical and Materials Transactions A,1988,19(11):2713-2721.
[23]HU Geng-xiang,CAI Xun,RONG Yong-hua.Fundamentals of materials science[M].Shanghai:Shanghai Jiao Tong University Press,2015:230-232.(in Chinese)
[24]LI Yuan-dong,CHEN Ti-jun,MA Ying,YAN Feng-yun,HAO Yuan.Microstructural characteristic and secondary solidification behavior of AZ91D alloy prepared by thixoforming[J].Transactions of Nonferrous Metals Society of China,2008,18(1):18-23.
[25]MULLINS W W,SEKERKA R F.Morphological stability of a partical growing by diffusion or heat flow[J].Journal of Applied Physics,1963,34(2):323-329.
[26]HITCHCOCK M,WANG Y,FAN Z.Secondary solidification behaviour of the Al-Si-Mg alloy prepared by the rheo-diecasting process[J].Acta Materialia,2007.55(5):1589-1598.
[27]BURDEN M H,HUNT J D.Cellular and dendritic growth[J].Journal of Crystal Growth,1974,22(2):109-116.
[28]HUNT J D,LU S Z.Numerical modeling of cellular/dendritic array growth:spacing and structure predictions[J].Metall Mater Trans A,1996,27(3):611-623.
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