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| 时效温度对7050铝合金屈服强度的影响与本构模型研究 |
| Effect of Ageing Temperature on Yield Strength of Aluminium Alloy 7050 and Constitutive Modeling Investigation |
| Received:January 14, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.03.010 |
| 中文关键词: 时效热处理 本构模型 时效温度 铝合金 强度预测 |
| 英文关键词: ageing heat treatment constitutive model ageing temperature aluminium alloy prediction of strength |
| 基金项目:国家自然科学基金(52305332) |
| Author Name | Affiliation | | ZHOU Qingheng | Beihang University, Beijing 100191, China | | XIAO Xuelian | Beihang University, Beijing 100191, China | | HUANG Xia | Beihang University, Beijing 100191, China
AVIC Manufacturing Technology Institute, Beijing 100024, China | | LI Yong | Beihang University, Beijing 100191, China | | LI Dongsheng | Beihang University, Beijing 100191, China | | ZHOU Wenbin | Beihang University, Beijing 100191, China |
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| 中文摘要: |
| 目的 预测不同时效条件下7050铝合金力学性能的演化规律，为多级快速时效热处理工艺提供理论基础。方法 分别在120、160、180 ℃温度下对7050铝合金进行0~8 h时效热处理，并进行室温单拉试验，获得相应时效条件组合的应力-应变曲线及屈服强度演化曲线，建立统一时效本构模型，模拟微观组织(沉淀半径、溶质浓度)的演化规律，根据微观组织的演化规律，模拟由析出强度与固溶强度组成的屈服强度的演化规律。结果 在不同时效温度下，模拟的屈服强度演化规律与试验结果基本保持一致，模拟的微观组织演化规律与理论分析结果基本保持一致。在160 ℃时效热处理8 h和180 ℃时效热处理2 h条件下得到了试验峰值屈服强度，分别为578.6 MPa和555.8 MPa，在模拟结果中也得到了相应的演化结果。在120 ℃下，屈服强度的试验结果与模拟结果均呈上升趋势。结论 所建立的统一本构模型考虑了时效温度、时效时间的影响，成功预测了不同时效温度条件下析出相半径、溶质浓度等微观变量的演化规律，这些变量都有助于预测合金析出强度与固溶强度的演化规律，进而成功预测了由这2个强度分量组成的屈服强度的演化规律。 |
| 英文摘要: |
| The work aims to predict the evolution of mechanical properties of aluminium alloy 7050 under different ageing conditions so as to provide a theoretical basis for the multi-steps rapid ageing heat treatment process. In this study, after ageing at 120 ℃, 160 ℃ and 180 ℃ for 0-8 h, the uniaxial tensile tests of AA7050 at room temperature was carried out to obtain the stress-strain curve and yield strength evolution curve of the samples after the corresponding ageing conditions. A unified ageing constitutive model was established to simulate the evolution of microstructure (precipitation radius, solute concentration). According to the evolution of microstructure, the evolution of yield strength composed of precipitation strength and solution strength was simulated. At different ageing temperature, the simulated yield strength evolution was basically consistent with the experimental results, and the simulated microstructure evolution was basically consistent with the theoretical analysis. The peak yield strength, which resulted from experiments, was obtained at after ageing at 160 ℃ for 8 h and ageing at 180 ℃ for 2 h, 578.6 MPa and 555.8 MPa respectively. The corresponding evolutionary trend was also obtained in the simulation results. At 120 ℃, both the experimental results and the simulated results of yield strength showed an increasing trend. The established unified constitutive model takes into account the effects of ageing temperature and ageing time, and successfully predicts the evolution of micro-variables such as precipitation radius and solute concentration at different ageing temperature. These variables are helpful to predict the evolution of precipitation strength and solid solution strength of AA7050, and then successfully predict the evolution of yield strength composed of these two strength components. |
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