Microstructure evolution of ultrafine grained aluminum alloy prepared by large strain extrusion machining during annealing

被引:2
作者
Zhou, Zihan [1 ]
Wu, Bangxian [1 ]
Chen, Haitao [1 ]
Zhang, Baoyu [1 ]
Deng, Wenjun [1 ]
机构
[1] South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China
来源
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 11期
基金
中国国家自然科学基金;
关键词
ultrafine grained; microstructure; aluminum alloy; large strain extrusion machining; severe plastic deformation; annealing; MECHANICAL-PROPERTIES; HIGH-STRENGTH; DEFORMATION; METALS;
D O I
10.1088/2053-1591/ab4850
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
As a new type of severe plastic deformation (SPD) method for efficiently preparing ultrafine grained (UFG) material, large strain extrusion machining (LSEM) has attracted the attention of researchers. At the same time, the UFG material prepared by the process has a small size, and the influence of external heat is involved in the subsequent utilization. Therefore, in this paper, the microstructure evolution of UFG6061 Al alloy chips prepared by LSEM during annealing has been investigated. The UFG chips were subjected to isochronous and isothermal annealing treatments. The microstructure of UFG chips was characterized by scanning electron microscope (SEM) with electron backscattered diffraction (EBSD) system. The results showed that with the increase of annealing temperature, the UFG aluminum alloy chips underwent three processes of recovery, recrystallization and grain growth. When the annealing temperature was 160 degrees C, with the extension of annealing time, the UFG aluminum alloy chips remained at the recovery stage, the point defects and dislocations were reduced, the dislocation density was reduced, and the grain size was not changed significantly.
引用
收藏
页数:11
相关论文
共 24 条
[1]  
[Anonymous], 2005, Recrystallization and Related Annealing Phenomena
[2]   Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining [J].
Cai, S. L. ;
Dai, L. H. .
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2014, 73 :84-102
[3]  
Chandrasekar P, MAT MANUF PROCESS, P1
[4]   The Correlation of Microstructure and Mechanical Properties of In-Situ Al-Mg2Si Cast Composite Processed by Equal Channel Angular Pressing [J].
Chegini, Mahdi ;
Shaeri, Mohammad Hossein ;
Taghiabadi, Reza ;
Chegini, Sajjad ;
Djavanroodi, Faramarz .
MATERIALS, 2019, 12 (09)
[5]   Thermal stability of ultrafine grained aluminium alloy prepared by large strain extrusion machining [J].
Deng, W. J. ;
Li, Q. ;
Li, B. L. ;
Xie, Z. C. ;
He, Y. T. ;
Tang, Y. ;
Xia, W. .
MATERIALS SCIENCE AND TECHNOLOGY, 2014, 30 (07) :850-859
[6]   Analysis of Large-Strain Extrusion Machining with Different Chip Compression Ratios [J].
Deng, Wen Jun ;
Lin, Ping ;
Xie, Zi Chun ;
Li, Qing .
JOURNAL OF NANOMATERIALS, 2012, 2012
[7]   Mechanics of large strain extrusion machining and application to deformation processing of magnesium alloys [J].
Efe, Mert ;
Moscoso, Wilfredo ;
Trumble, Kevin P. ;
Compton, W. Dale ;
Chandrasekar, Srinivasan .
ACTA MATERIALIA, 2012, 60 (05) :2031-2042
[8]   Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion [J].
Heczel, Anita ;
Kawasaki, Megumi ;
Labar, Janos L. ;
Jang, Jae-il ;
Langdon, Terence G. ;
Gubicza, Jeno .
JOURNAL OF ALLOYS AND COMPOUNDS, 2017, 711 :143-154
[9]   Friction and wear of nanostructured metals created by large strain extrusion machining [J].
Iglesias, P. ;
Bermudez, M. D. ;
Moscoso, W. ;
Rao, B. C. ;
Shankar, M. R. ;
Chandrasekar, S. .
WEAR, 2007, 263 :636-642
[10]   Grain size effects in aluminum processed by severe plastic deformation [J].
Koizumi, Takayuki ;
Kuroda, Mitsutoshi .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2018, 710 :300-308