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首页> 外文学位 >Effect of aging and overhanging on fatigue behavior of 2024-T3 and 7075-T6 aluminum alloys.
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Effect of aging and overhanging on fatigue behavior of 2024-T3 and 7075-T6 aluminum alloys.

机译：时效和悬伸对2024-T3和7075-T6铝合金疲劳性能的影响。

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摘要

The object of this study was to investigate the low temperature long time aging effect of 2024-T3 and 7075-T6 on the fatigue life of the CT-114 tutor aircraft.; The alloys were artificially reaged. Mechanical properties of yield strength and ductility, material properties of hardness and electrical conductivity were measured and related to the changes in fracture toughness and microstructure as altered by the various aging conditions.; Major changes in the material and mechanical properties behavior of 7075-T6 took place at the reaging condition of 175{dollar}spcirc{dollar}C for 38 hours. Similar changes in 2024-T3 alloy took place at the reaging condition of 175{dollar}spcirc{dollar}C for 150 hours.; Both 2024-T3 and 7075-T6 have complex fatigue life behaviors. Initially the fatigue life of each alloy increases to peakaged condition and thereafter decreases continuously. However, highly overaged 2024-T3 alloy provides an overall improved fatigue life. When compared to their original material, both alloys provide better fatigue life at least up to 300 accumulated fours of operations at 175{dollar}spcirc{dollar}C.
机译：这项研究的目的是研究2024-T3和7075-T6的低温长时间老化对CT-114导师飞机疲劳寿命的影响。合金经过人工后处理。测量了屈服强度和延展性的机械性能，硬度和导电性的材料性能，并与各种时效条件所改变的断裂韧性和微观结构的变化有关。 7075-T6的材料和力学性能的主要变化发生在175 thespcirc {dollarC}的再老化条件下38小时。 2024-T3合金在175℃时效150小时的时效条件下发生了类似的变化。 2024-T3和7075-T6均具有复杂的疲劳寿命行为。最初，每种合金的疲劳寿命增加到峰值状态，然后连续降低。但是，过度老化的2024-T3合金可提供总体上改善的疲劳寿命。与原始材料相比，两种合金在175 {spcirc {dollar} C时至少可进行300次累积四次操作，从而具有更好的疲劳寿命。

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