李兵,陈文轩,张红霞,等.固溶温度和保压淬火时间对7075铝合金板材组织和性能的影响[J].精密成形工程,2024,16(11):144-150.
LI Bing,CHEN Wenxuan,ZHANG Hongxia,et al.Effect of Solid Solution Temperature and Holding and Quenching Time on the Microstructure and Properties of 7075 Aluminum Alloy Plates[J].Journal of Netshape Forming Engineering,2024,16(11):144-150. |
| 固溶温度和保压淬火时间对7075铝合金板材组织和性能的影响 |
| Effect of Solid Solution Temperature and Holding and Quenching Time on the Microstructure and Properties of 7075 Aluminum Alloy Plates |
| 投稿时间：2024-04-09 |
| DOI：10.3969/j.issn.1674-6457.2024.11.017 |
| 中文关键词: 7075铝合金 固溶温度 保压淬火时间 微观组织 力学性能 |
| 英文关键词: 7075 aluminium alloy solid solution temperature holding and quenching time microstructure mechanical properties |
| 基金项目:湖北省科技重大专项(2022AAA001) |
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| 摘要点击次数: 142 |
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| 中文摘要: |
| 目的 为了解决铝合金在室温下塑性差等问题，结合铝合金固溶处理的特点，采用平板压淬实验来模拟温热成形。对Al-Zn-Mg-Cu高强铝合金进行不同固溶温度和保压淬火时间的研究，以期得到7075铝合金板材固溶成形的最佳工艺参数。方法 首先对合金板材进行不同温度下的固溶处理，再对固溶处理后的铝合金板进行平板压淬实验，通过室温单轴拉伸、光学显微镜和扫描电镜等试验研究了在保压压力一定的条件下，固溶温度和保压淬火时间对合金时效后拉伸性能和组织的影响。结果 固溶温度的升高可以促进粗大相的回溶，对晶界以及晶内析出相影响程度较小。在同一固溶温度下，随保压时间的增加，铝基体晶粒有所细化。当固溶温度为530 ℃、保压时间为6 s并人工时效170 ℃/120 min时，试样的抗拉强度达到最大值，为509.2 MPa。当固溶温度为500 ℃、保压淬火时间为9 s时，再时效的试样可以得到较理想的强塑性匹配，抗拉强度为496.3 MPa，屈服强度为473.6 MPa，断后伸长率为12%。拉伸断口分析结果表明，随保压时间的延长，韧窝数量有所增加并且深度不断加深，材料塑性得到改善。结论 分析了不同固溶温度和保压淬火时间下Al-Zn-Mg-Cu高强铝合金组织的演变规律和力学性能变化情况，得出了较为符合实践生产节拍的温热成形工艺参数。 |
| 英文摘要: |
| In order to solve the problems such as poor plasticity of aluminum alloys at room temperature, combined with the characteristics of solid solution treatment of aluminum alloys, the work aims to simulate warm forming with the plate pressure quenching experiment and study Al-Zn-Mg-Cu high-strength aluminum alloys under the condition of different solid solution temperatures and holding and quenching time to obtain the optimum process parameters for solid solution forming of 7075 aluminum alloy plates. Firstly, the solid solution treatment was carried out to alloy plates at different temperatures, and then the flat plate pressure quenching experiment was conducted on the solution-treated aluminum alloy plates. The effects of solid solution temperature and holding and quenching time on the tensile properties and microstructure of the alloy after aging were studied by room temperature uniaxial stretching, optical microscopy and scanning electron microscopy, etc. The increase of solid solution temperature could promote the dissolution of the coarse phase, and the effect on the grain boundary and the intracrystalline precipitated phase was minor. At the same solid solution temperature, the aluminum matrix grain was refined with the increase of holding time. When the solid solution temperature was 530 ℃, the holding time was 6 s and the artificial aging was 170 ℃/ 120 min, the tensile strength of the specimen reached the maximum value of 509.2 MPa. When the solid solution temperature was 500 ℃, the holding and quenching time was 9 s, the specimen subject to re-aging could get a better match between the strength and plasticity, a tensile strength of 496.3 MPa, a yield strength of 473.6 MPa, and an elongation of 12% after break. The tensile fracture analysis showed that the number of tough nests increased and the depth was deepened with the increase of holding time, and the plasticity of the material was improved. The microstructure evolution and mechanical properties of Al-Zn-Mg-Cu high-strength aluminum alloys under different solid solution temperatures and holding and quenching time are analyzed and warm forming process parameters that are more in line with the production rhythm in practice are derived. |
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