消除7136铝合金固溶热处理粗晶环的新方法:应变固溶

doi:10.11896/cldb.20040121

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Abstract The peripheral coarse grain (PCG) structure is a kind of typical defect in the extruded high strength aluminum alloys. A new method which called strain solution, is capable of eliminating the PCG structure formed in the solution treatment of 7136 aluminum alloy. Before two-stage solution (450 ℃/2 h + 470 ℃/4 h), the alloy samples were deformed to introduce various tensile strains at 420 ℃ and then kept at the same temperature for 2 h. It can be found in the two-stage solution-treated sample that the depth of PCG structure varied inversely with tensile strain introduced during strain solution, and that PGG could be eliminated when the strain introduced reached 4.6%. The strain solution consumes and releases the stored deformation energy at a relatively low temperature, and consequently, suppresses the coarsening of particles at the edge of extrusion during the two-stage solution treatment. As a result, the recrystallization behavior is regulated. This mechanism was supported by TEM and EBSD measurements of the sample which experienced strain-solution (4.6% strain) treatment prior to two-stage solution treatment, and the sample which was directly two-stage solution-treated: the former had a recrystallization volume fraction at the edge of 49.5%, fairly lower than that of the latter (76.4%), and also was spared from the generation of PGG structure for the growth of the recrystallized grains which formed fine equiaxial grains. In addition, the introduction of strain-solution treatment led to a slight reduction of material hardness, while a substantial amount of the [111]-oriented (i.e. parallel to the extrusion direction) grains were retained at the center of the sample.

Key words： peripheral coarse grain structure microstructure defect 7xxx series aluminum alloy extrusion solution recrystallization

Published: 03 August 2021

CLC number:

TG379

Fund:Key Scientific and Technological Project of Foshan City (1920001000409), National Natural Science Foundation of China (U1708251).

About author:: Fan Zhao received his Ph.D. degree in materials from University of Science and Technology Beijing in 2019. He is currently a lecturer in Institute for Advanced Materials and Technology, University of Science and Technology Beijing. His research interests are numerical simulation and microstructure-property control of advanced metal materials, materials design and processing based on big data and machine learning.
Zhihao Zhang received his Ph.D. degree in materials from University of Science and Technology Beijing in 2005. He is currently a professor in Institute for Advanced Materials and Technology, University of Science and Technology Beijing. His research interests are extrusion theory and technique of advanced materials, controlled solidification and forming of high-silicon electrical steels, processing of metal matrix composite.

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Cite this article:

ZHAO Fan,HE Ying,ZHANG Zhihao. A New Method for Eliminating Peripheral Coarse Grain Structure Formed in the Solution Treatment of 7136 Aluminum Alloy: Strain Solution[J]. Materials Reports, 2021, 35(14): 14079-14083.

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http://www.mater-rep.com/EN/10.11896/cldb.20040121 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14079

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