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| 热处理时效时间对激光增材制造Al-Mg-Sc-Zr合金拉伸性能的影响研究 |
| Effect of Heat Treatment Aging Time on Tensile Properties of Laser Additive Manufactured Al-Mg-Sc-Zr Alloy |
| Received:January 29, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.05.006 |
| 中文关键词: 激光增材制造 Al-Mg-Sc-Zr 时效热处理 微观组织 拉伸性能 |
| 英文关键词: laser additive manufacturing Al-Mg-Sc-Zr heat treatment microstructure tensile property |
| 基金项目:国家重点研发计划(2022YFB4602300) |
| Author Name | Affiliation | | DUAN Yuhang | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China | | WANG Leilei | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China | | HAO Lujing | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China | | YUAN Shuaichao | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China | | ZHAO Yanqiu | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China | | ZHAN Xiaohong | College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China |
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| 中文摘要: |
| 目的 研究热处理时效时间对激光增材制造Al-Mg-Sc-Zr合金微观组织与拉伸性能的影响，揭示微观组织与力学性能的内在关联机制。方法 采用控制单一变量的试验方法进行时效热处理，设定保温温度为325 ℃，冷却方式为空冷，在不同保温时间(2、4、6、8 h)下进行组织与性能共通性及差异性分析。结果 经325 ℃时效热处理4 h后，在激光增材制造Al-Mg-Sc-Zr高强铝合金中形成了Al3Sc、Al3(Sc,Zr)析出相，抗拉强度达到最大值486 MPa，相较于未热处理，提升了21.8%，随着保温时间的进一步延长，析出相的高温停留时间变长，组织形核长大，Al3Sc、Al3(Sc,Zr)强化相尺寸明显增大，最大尺寸可达0.6 μm。结论 随着时效时间的延长，沉积道次间重熔边界逐渐不明显，热处理有助于Al3Sc、Al3(Sc,Zr)析出相的形成，而保温时间过长则容易导致析出相尺寸粗大，合理的热处理保温时间可以改善激光增材制造Al-Mg-Sc-Zr合金微观组织与力学性能。 |
| 英文摘要: |
| The work aims to study the effect of heat treatment aging time on the microstructure and tensile properties of laser additive manufactured Al-Mg-Sc-Zr alloy and reveal the internal correlation mechanism between microstructure and mechanical properties. The aging heat treatment was conducted by a single variable control test method. The holding temperature was set at 325 ℃ and the cooling method was air cooling. The commonality and difference of microstructure and properties after different holding time (2, 4, 6, 8 h) were analyzed. After aging heat treatment at 325 ℃ for 4 h, precipitates of Al3Sc and Al3(Sc,Zr) were formed in Al-Mg-Sc-Zr high-strength aluminum alloy made by laser additive manufacturing, and the tensile strength reached the maximum value of 486 MPa, which increased by 21.8% compared with that without heat treatment. With the further extension of holding time, the precipitates had a long residence time at high temperature. The size of Al3Sc and Al3(Sc,Zr) strengthening phase increased significantly, with the maximum size up to 0.6 μm. With the increase of aging time, the remelting boundary between deposition passes gradually becomes less obvious. Heat treatment is conducive to the formation of Al3Sc and Al3(Sc,Zr) precipitates, while too long holding time will easily lead to coarse precipitates. Reasonable heat treatment holding time can improve the microstructure and mechanical properties of laser additive manufactured Al-Mg-Sc-Zr alloy. |
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