Microstructure evolution of 3003-H16 aluminum alloy coil in production process

doi:10.13251/j.issn.0254-6051.2022.10.007

Abstract

Abstract: Microstructure evolution of 3003-H16 aluminum alloy coil in production process was studied by means of thermal analyzer, optical microscope, SEM and EDS. The results show that the grain size, secondary dendrite spacing and the size of grain boundary compounds decrease gradually from center to surface of the ingot. When the homogenization temperature is 590 ℃, fine granular Al₆Mn precipitates in α-Al crystal. With the increase of homogenization temperature, the granular precipitates dissolve continuously and promote the growth of needle-rod precipitates. When the homogenization temperature is 640 ℃, the rod-shaped precipitates begin to dissolve, and completely dissolve at 650 ℃.The intermetallic compounds Al₆(Fe,Mn) and Al₆Mn become smooth and spheroidized with the increase of homogenization temperature, and some Al₆(Fe,Mn) transforms into Al(Fe,Mn)Si during homogenization. The grain structure of the the 3003 aluminum alloy hot rolled coil is non-uniform in thickness direction, which is improved after cold rolling and intermediate annealing. The compounds in the 3003 aluminum alloy coil are arranged in rows along the rolling direction, with obvious directionality. The proportion of large-sized compounds decreases with the increase of reduction ratio. Homogenization can improve the composition and microstructure uniformity of the 3003 aluminum alloy and improve the plasticity of the alloy. Deformation processing can improve the strength of the 3003 aluminum alloy and reduce the plasticity of the alloy. The fibrous deformed structure is transformed intorecrystallized structure during the intermediate annealing, which eliminates the hardening phenomenon and improves the plasticity of the alloy.

Key words: intermetallic compound, homogenization, precipitated phase, deformation processing, grain structure, recrystallization

CLC Number:

Luo Xudong, Zu Licheng, Wang Fei, Zhang Xinyu, Chen Jinsheng, Qin Junjie. Microstructure evolution of 3003-H16 aluminum alloy coil in production process[J]. Heat Treatment of Metals, 2022, 47(10): 36-45.

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