TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate
The time-temperature-transformation (TTT) diagrams of 7A36 aluminum alloy extruded plate were determined by an interrupted-quench method. The quenching precipitation behavior was investigated by calculate phase diagram(CALPHAD) combined with optical microscopy(OM), scanning electron microscopy(SEM),...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2023-11-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000803 |
| _version_ | 1797335435878334464 |
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| author | LIU Jia MA Zhimin LIU Shengdan DENG Yunlai ZHANG Xinming |
| author_facet | LIU Jia MA Zhimin LIU Shengdan DENG Yunlai ZHANG Xinming |
| author_sort | LIU Jia |
| collection | DOAJ |
| description | The time-temperature-transformation (TTT) diagrams of 7A36 aluminum alloy extruded plate were determined by an interrupted-quench method. The quenching precipitation behavior was investigated by calculate phase diagram(CALPHAD) combined with optical microscopy(OM), scanning electron microscopy(SEM), transmission electron microscopy(TEM), scanning transmission electron microscopy(STEM) and high-resolution transmission electron microscopy(HRTEM). The results show that the critical quenching rate for inhibiting the phase transition of 7A36 aluminum alloy by 0.5% is about 15.7 ℃/s. Based on 10%TTT diagram, the nose temperature is determined to be about 338 ℃ with the transformation time of about 22 s. The precipitation of η(MgZn2), T(Al2Zn3Mg3), S(Al2CuMg) or Cu-Zn rich Y phases can be found depending on different isothermal holding temperatures and time, and the precipitation behavior is described in the TTT curve, which is described as a time-temperature-precipitation diagram.η equilibrium phase tends to occur at grain boundary(GB) first and then at sub-grain boundary(SGB) and on dispersoids in the interior of grains, at higher isothermal holding temperature, the size of η phase is larger. The electrical conductivity increases first and then decreases with the increase of holding temperature; isothermal holding at 420 ℃, the increase of electrical conductivity is caused by precipitation of η phase and T phase, while at 330 ℃ and 240 ℃, the increase of electrical conductivity is due to the precipitation of η phase, T phase, S phase and Y phase. |
| first_indexed | 2024-03-08T08:37:05Z |
| format | Article |
| id | doaj.art-2c6a7e318dbc4f88929cb731c38ec68f |
| institution | Directory Open Access Journal |
| issn | 1001-4381 |
| language | zho |
| last_indexed | 2024-03-08T08:37:05Z |
| publishDate | 2023-11-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-2c6a7e318dbc4f88929cb731c38ec68f2024-02-02T00:37:14ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812023-11-01511113414310.11868/j.issn.1001-4381.2022.00080320231114TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plateLIU Jia0MA Zhimin1LIU Shengdan2DENG Yunlai3ZHANG Xinming4Baotou Vocational & Technical College, Baotou 014030, Inner Mongolia, ChinaBaotou Vocational & Technical College, Baotou 014030, Inner Mongolia, ChinaIndustry-University-Research-Application Innovation Center, School of Materials Science and Engineering of Central South University-Baotou Vocational & Technical College, Baotou 014030, Inner Mongolia, ChinaIndustry-University-Research-Application Innovation Center, School of Materials Science and Engineering of Central South University-Baotou Vocational & Technical College, Baotou 014030, Inner Mongolia, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaThe time-temperature-transformation (TTT) diagrams of 7A36 aluminum alloy extruded plate were determined by an interrupted-quench method. The quenching precipitation behavior was investigated by calculate phase diagram(CALPHAD) combined with optical microscopy(OM), scanning electron microscopy(SEM), transmission electron microscopy(TEM), scanning transmission electron microscopy(STEM) and high-resolution transmission electron microscopy(HRTEM). The results show that the critical quenching rate for inhibiting the phase transition of 7A36 aluminum alloy by 0.5% is about 15.7 ℃/s. Based on 10%TTT diagram, the nose temperature is determined to be about 338 ℃ with the transformation time of about 22 s. The precipitation of η(MgZn2), T(Al2Zn3Mg3), S(Al2CuMg) or Cu-Zn rich Y phases can be found depending on different isothermal holding temperatures and time, and the precipitation behavior is described in the TTT curve, which is described as a time-temperature-precipitation diagram.η equilibrium phase tends to occur at grain boundary(GB) first and then at sub-grain boundary(SGB) and on dispersoids in the interior of grains, at higher isothermal holding temperature, the size of η phase is larger. The electrical conductivity increases first and then decreases with the increase of holding temperature; isothermal holding at 420 ℃, the increase of electrical conductivity is caused by precipitation of η phase and T phase, while at 330 ℃ and 240 ℃, the increase of electrical conductivity is due to the precipitation of η phase, T phase, S phase and Y phase.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.0008037a36 aluminum alloytime-temperature-transformation diagramquenching sensitivityquench-ing precipitation phase |
| spellingShingle | LIU Jia MA Zhimin LIU Shengdan DENG Yunlai ZHANG Xinming TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate Cailiao gongcheng 7a36 aluminum alloy time-temperature-transformation diagram quenching sensitivity quench-ing precipitation phase |
| title | TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate |
| title_full | TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate |
| title_fullStr | TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate |
| title_full_unstemmed | TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate |
| title_short | TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate |
| title_sort | ttt diagrams and quenching precipitation behavior of 7a36 aluminum alloy extruded plate |
| topic | 7a36 aluminum alloy time-temperature-transformation diagram quenching sensitivity quench-ing precipitation phase |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000803 |
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