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张鹏,陈明和,武永,谢兰生.热处理2024-O铝合金在自然时效下的拉伸性能及断口形貌演变[J].稀有金属材料与工程(英文),2020,49(3):819~824.[Peng Zhang,Ming-he CHEN,Yong Wu and Lan-sheng XIE.Effect of natural aging time on tensile properties and fracture of heat-treated AA2024-O Al-alloy[J].Rare Metal Materials and Engineering,2020,49(3):819~824.]
Effect of natural aging time on tensile properties and fracture of heat-treated AA2024-O Al-alloy
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Received:November 02, 2018  Revised:January 05, 2019
DOI:
Key words: AA2024  natural aging  aging strengthening  fracture
Foundation item:国家自然科学基金资助项目 No.51175252
Author NameAffiliation
Peng Zhang,Ming-he CHEN,Yong Wu and Lan-sheng XIE  
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Abstract:
      The effect of natural aging time on tensile properties and fracture of the heat-treated AA2024-O Al-alloy was investigated. The stress-strain curves, the yield strength and the tensile strength of the specimens with different natural aging time were obtained by carrying out tensile test at room temperature. The constitutive equation that could predict the stress was established. The effect of natural aging time on the material microstructure was analyzed by observing the fracture. The results of the experiment demonstrated that the specimens were gradually strengthened to a certain point, and then the yield stress and the ultimate tensile strength decreased until the material reached a stable state. There were many dimples distributed on the fracture surface that was observed by SEM, so the fracture surfaces were thought to be a ductile fracture. Despite natural aging during long periods, the specimens of dimples became fewer and the plasticity worsened. A series of phenomenological functions were presented for establishing the constitutive equation of AA2024-O Al-alloy strengthened. The model could predict the stress of the naturally aged material.