| 闫路,刘斌斌,曲斌瑞,孙文东.平贮ZL205A铝合金微观缺陷与宏观力学性能关系研究[J].装备环境工程,2023,20(10):22-29. YAN Lu,LIU Bin-bin,QU Bin-rui,SUN Wen-dong.Relationship between Microdefects and Mechanical Properties of ZL205A Aluminum Alloy after Long-time Storage[J].Equipment Environmental Engineering,2023,20(10):22-29. |
| 平贮ZL205A铝合金微观缺陷与宏观力学性能关系研究 |
| Relationship between Microdefects and Mechanical Properties of ZL205A Aluminum Alloy after Long-time Storage |
| 投稿时间：2023-09-15 修订日期：2023-10-10 |
| DOI：10.7643/issn.1672-9242.2023.10.003 |
| 中文关键词: ZL205A 微观缺陷 室温拉伸 高温拉伸 室温疲劳 室温冲击中图分类号:TG146.2+1 文献标识码:A 文章编号:1672-9242(2023)10-0022-08 |
| 英文关键词:ZL205A microdefects room temperature tensile high temperature tensile room temperature fatigue room temperature impact |
| 基金项目:航天部金属材料预研课题(JPPT-2016-010) |
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| 中文摘要: |
| 目的 评估长期贮存ZL205A铝合金的微观缺陷对性能的影响。方法 利用X射线无损检测研究平贮合金的缺陷等级分布，并进一步研究合金室温拉伸、高温拉伸、室温疲劳和室温冲击性能。结果 经过平贮12 a后的ZL205A铝合金，其微观缺陷即针孔等级位于1~6级，仅发现少量的伴生带状偏析。室温拉伸时，1~3级针孔样品的抗拉强度为380 MPa，而5级针孔样品的抗拉强度大幅下降到340.5 MPa，表明室温下4级及以上针孔对于拉伸强度有着重要影响。高温拉伸时，仅在100 ℃表现为样品缺陷等级越高，抗拉强度越高的趋势。常温疲劳试验表明，在107周的寿命下，合金的疲劳极限为99.2 MPa。常温冲击试验发现，1级针孔样品的平均冲击吸收能量为3.19 J，明显优于其他针孔等级样品。结论 室温拉伸和室温冲击时，材料的力学性能与缺陷等级密切相关。高温拉伸时，温度上升导致材料强度下降的作用超过了缺陷自身对性能的影响。 |
| 英文摘要: |
| The work aims to evaluate the effect of microdefects on the properties of ZL205A aluminum alloy after long-time storage. The X-ray non-destructive testing was firstly introduced to study the distribution of microdefect levels and then mechanical propertied including room temperature and high temperature tensile, room temperature fatigue and room temperature impact were investigated. After storage at room temperature for 12 years, the microdefect levels of ZL205A aluminum alloy ranged from 1 to 6, while a few associated band segregations were determined as well. The room temperature tensile strength of samples with microdefect level from 1 to 3 was around 380 MPa, but it decreased to 340.5 MPa in the samples with microdefect level 5. The results indicated that microdefect level higher than 4 had great impact on the tensile strength at room temperature. However, the trend of higher microdefect level leading to larger tensile strength was only observed at 100 ℃ during high temperature tensile. Room temperature fatigue tests indicated that the fatigue limit of ZL205A alloy was 99.2 MPa under the fatigue life capability of 107 cycles. The average impact absorbed energy of samples with microdefect level 1 was 3.19 J, obviously higher than that of samples with lower microdefect levels. The room temperature tensile and impact properties show strong dependence on the microdefect levels. At high temperature tensile, the decrease of strength is determined by temperature rather than microdefect levels. |
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