| 快速获得7055铝合金淬火敏感温度区间的新方法及机理（英文） |
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| 引用本文： | 盛晓菲,贺存孝,程亚娟,饶晓晓,何国爱.快速获得7055铝合金淬火敏感温度区间的新方法及机理（英文）[J].中国有色金属学会会刊,2023,33(1):36-45. |
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| 作者姓名： | 盛晓菲 贺存孝 程亚娟 饶晓晓 何国爱 |
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| 作者单位： | 1. 中南大学材料科学与工程学院;2. 湖北汽车工业学院材料科学与工程学院;3. 中南大学轻合金研究所;4. 中南大学高性能复杂制造国家重点实验室;5. 广州大学物理与材料科学学院 |
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| 基金项目： | funded by the National Key Research and Development Plan of China (No. 2020YFA0711104)；;the National Natural Science Foundation of China (No. 51901247)； |
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| 摘 要： | 采用一种省时、节约资源的变温热处理(ATHT)新方法，基于硬度与电导率，获得喷射沉积7055铝合金的淬火敏感温度区间。此外，通过透射电子显微镜(TEM)表征ATHT期间的显微组织演变。研究表明，7055合金的ATHT是一个溶质原子随着温度的升高而析出和再溶解的过程。当温度达到200℃时，合金的硬度急剧增加，电导率适当增加。随着温度升高到400℃以上，电导率从峰值迅速下降，表明溶质原子回溶加速，同时，在基体内η’强化相逐渐转变成η平衡相。通过对硬度曲线和电导率曲线的分析，得出当前合金淬火敏感性温度范围为200～400℃，这与传统分级保温法测得的结果一致。
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| 关 键 词： | 铝合金 变温热处理 淬火敏感温度区间 显微组织演变 |
| 收稿时间： | 22 October 2021 |
New method and mechanism for quickly obtaining quenching sensitivity temperature range of 7055 aluminum alloy |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, China;3. Light Alloy Research Institute, Central South University, Changsha 410083, China;4. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;5. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China |
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| Abstract: | An alternating temperature heat treatment (ATHT) method with time-saving and resource-saving advantages was employed to measure the quenching sensitivity temperature range of the spray-deposited 7055 aluminum alloy based on hardness and electrical conductivity. Additionally, the microstructure evolution during ATHT was characterized by transmission electron microscopy (TEM). It was found that during ATHT of the 7055 alloy, the solute atoms precipitated, grew, and redissolved as the temperature increased. When the temperature reached 200 °C, the hardness of the alloy increased sharply, and the electrical conductivity increased modestly. As the temperature was increased above 400 °C, the electrical conductivity of this alloy declined rapidly and the solute atoms in the alloy redissolved quickly. Meanwhile, the η’ strengthening phase in the alloy gradually evolved into the η equilibrium phase. By analyzing the hardness and electrical conductivity curves, the temperature range of quenching sensitivity for the current alloy was 200?400 °C, which was consistent with the results measured by the traditional graded heat preservation method. |
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| Keywords: | aluminum alloy alternating temperature heat treatment quenching sensitivity temperature range microstructure evolution |
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