文献类型：期刊文献

中文题名：Deformation mechanism and forming properties of 6061Al alloys during compression in semi-solid state

英文题名：Deformation mechanism and forming properties of 6061Al alloys during compression in semi-solid state

作者：Shang Shu-zhen[1];Lu Gui-min[1];Tang Xiao-ling[1];Zhao Zu-xin[1];Wu Cheng-ming[2]

机构：[1]E China Univ Sci & Technol, Key Lab Safety Sci Pressurized Syst, Minist Educ, Shanghai 200237, Peoples R China;[2]Zhejiang Geely Automobile Res Inst Co Ltd, Linhai 317000, Peoples R China

年份：2010

卷号：20

期号：9

起止页码：1725

中文期刊名：Transactions of Nonferrous Metals Society of China

外文期刊名：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

收录：CSTPCD;;EI(收录号：20104013274391);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000282373800027)】；CSCD:【CSCD2011_2012】；

基金：Project(50874049) supported by the National Natural Science Foundation of China; Project(2008DFB50020) supported by International Science and Technology Cooperation of Ministry of Science and Technology of China

语种：英文

中文关键词：semi-solid processing; 6061Al alloy; compression deformation; microstructural evolution; thixotropic property

外文关键词：semi-solid processing; 6061Al alloy; compression deformation; microstructural evolution; thixotropic property

摘要：The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical simulator.The relationship between the true stress and the true strain at different temperatures and strain rates was studied with the deformation degree of 70%.The microstructures during the deformation process were characterized.The deformation mechanism and thixo-forming properties of the semi-solid alloys were analyzed.The results show that the homogeneous and non-dendrite microstructures of semi-solid 6061Al alloy manufactured by near-liquidus casting technology could be transformed into semi-solid state with the microstructure suitable for thixo-forming which are composed of near-spherical grains and liquid phase with eutectic composition through reheating process.The deformation temperature and strain rate affect the peak stress significantly rather than steady flow stress.The resistance to deformation in semi-solid state decreases with the increase of the deformation temperature and decrease of the strain rate.At steady thixotropic deformation stage, the thixotropic property is uniform, and the main deformation mechanism is the rotating or sliding between the solid particles and the plastic deformation of the solid particles.
The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical simulator. The relationship between the true stress and the true strain at different temperatures and strain rates was studied with the deformation degree of 70%. The microstructures during the deformation process were characterized. The deformation mechanism and thixo-forming properties of the semi-solid alloys were analyzed. The results show that the homogeneous and non-dendrite microstructures of semi-solid 6061Al alloy manufactured by near-liquidus casting technology could be transformed into semi-solid state with the microstructure suitable for thixo-forming which are composed of near-spherical grains and liquid phase with eutectic composition through reheating process. The deformation temperature and strain rate affect the peak stress significantly rather than steady flow stress. The resistance to deformation in semi-solid state decreases with the increase of the deformation temperature and decrease of the strain rate. At steady thixotropic deformation stage, the thixotropic property is uniform, and the main deformation mechanism is the rotating or sliding between the solid particles and the plastic deformation of the solid particles.