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Study of microstructure and mechanical property heterogeneity throughout the wall thickness of high strength aluminum alloy thick-wall pipe

Published online by Cambridge University Press:  19 July 2019

Gaoyong Lin
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, People’s Republic of China; and Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, People’s Republic of China
Weiyuan Song
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, People’s Republic of China; and Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, People’s Republic of China
Di Feng
Affiliation:
Department of Materials Science and Engineering, Jiangsu University of Science and Technology, Jiangsu 212003, People’s Republic of China
Kun Li
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, People’s Republic of China; and Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, People’s Republic of China
Yongping Feng
Affiliation:
Fujian Xiangxin Shares Co., Ltd., Fuzhou 350000, People’s Republic of China
Jinxia Liu
Affiliation:
Fujian Xiangxin Shares Co., Ltd., Fuzhou 350000, People’s Republic of China
Corresponding
E-mail address:
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Abstract

Differences in pipe wall microstructure at various positions throughout the wall thickness of high strength aluminum alloy thick-wall pipes produced by reverse hot extrusion were investigated. The microstructures of the inner wall (IW), outer wall (OW), and half wall (HW) were compared. Further, heterogeneity in the mechanical properties of the pipe throughout the wall thickness was also investigated. Results revealed that the volume fraction of precipitation was highest at the HW position because of the higher Zn and Mg contents. Further, approximately 26% of grains were recrystallized in the OW position due to the greater strain during extrusion, while the recrystallization fractions of the IW and HW positions were 13% and 21%, respectively. The effects of precipitation strengthening and deformation strengthening contribute to the highest ultimate tensile strength and Vickers hardness of the HW position, and to the higher elongation of the IW and OW positions.

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Copyright
Copyright © Materials Research Society 2019 

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