湖北汽车工业学院汽车材料学院,十堰 442000
杜威,男,2005年出生,本科生,E-mail:2538828865@qq.com
陈祥,男,1992年出生,讲师,E-mail:chenxiang@huat.edu.cn
收稿:2025-03-28,
修回:2025-06-05,
录用:2025-06-30,
纸质出版:2026-10-20
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杜威,白益诚,陈文轩,等. 固溶-预拉伸-时效协同提升7075铝合金强塑性研究[J]. 特种铸造及有色合金,2026,46(10):1 537-1 542.
DU W,BAI Y C,CHEN W X,et al. Synergistic enhancement of strength and ductility of 7075 aluminum alloy via solution, pre-stretching, and aging processes[J]. Special Casting & Nonferrous Alloys,2026,46(10):1 537-1 542.
杜威,白益诚,陈文轩,等. 固溶-预拉伸-时效协同提升7075铝合金强塑性研究[J]. 特种铸造及有色合金,2026,46(10):1 537-1 542. DOI: 10.15980/j.tzzz.T20250141.
DU W,BAI Y C,CHEN W X,et al. Synergistic enhancement of strength and ductility of 7075 aluminum alloy via solution, pre-stretching, and aging processes[J]. Special Casting & Nonferrous Alloys,2026,46(10):1 537-1 542. DOI: 10.15980/j.tzzz.T20250141.
采用固溶结合预拉伸以及后续时效处理的策略,研究了不同预拉伸变形量下时效态合金的微观组织及力学性能的影响。通过光学显微镜、扫描电镜及其配备的电子背散射衍射仪和万能力学性能试验机等进行测试表征分析。能谱测试分析表明,所有试样中均存在粗大的白色AlCuFeZn相和相对细小的AlZnMgCu相。当预拉伸5%并后续时效处理(120 ℃×12 h),可以得到较为理想的强塑性匹配,其屈服强度为490 MPa,抗拉强度达558 MPa,伸长率为15.1%,这可能归功于位错强化和沉淀强化。拉伸断口分析表明,所有试样均呈现出韧脆混合断裂特征,不同预拉伸量对韧窝的数量、尺寸和分布等特征影响不大。
A combined strategy of solution treatment, pre-stretching, and subsequent aging was employed to investigate the influence of varying pre-stretching deformations on microstructure evolution and mechanical properties of as-aged 7075 alloys. Characterizations were investigated by optical microscopy, scanning electron microscopy integrated with electron backscatter diffraction, and a universal mechanical testing machine. EDS results reveal the presence of coarse white AlCuFeZn intermetallic phases and relatively fine AlZnMgCu precipitates in specimens. Optimal strength-ductility combination is achieved in specimens subjected to 5% pre-stretching followed by aging at 120 ℃ for 12 h, where the yield strength, tensile strength and elongation reach 490 MPa, 558 MPa, and 15.1%, respectively. The superior mechanical performance can be attributed to the synergistic effects of dislocation strengthening and precipitation strengthening. Tensile fracture indicates that specimens are characterized by mixed ductile-brittle fracture, and pre-stretching magnitude has negligible effects on quantity, size, and distribution of dimples.
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