| 微观组织结构对变形镁合金AZ80阻尼性能的影响 |
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| 引用本文： | 严峰,高峰,权高峰.微观组织结构对变形镁合金AZ80阻尼性能的影响[J].大连铁道学院学报,2010(3):63-66. |
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| 作者姓名： | 严峰 高峰 权高峰 |
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| 作者单位： | 大连交通大学轨道交通关键材料辽宁省重点实验室; |
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| 基金项目： | 辽宁省教育厅高等学校科学研究计划资助项目(20060102) |
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| 摘 要： | 采用光学显微镜、扫描电镜和透射电镜观察了AZ80镁合金在挤压态、固溶态和时效态的显微组织,并用动态机械分析仪研究了不同微观组织状态下AZ80镁合金的阻尼性能.结果表明：AZ80合金在挤压过程中发生了动态再结晶,随后在410℃进行4 h固溶处理,强钉扎点数量减少,合金的阻尼性能提高,在170℃时效18 h由于第二相析出偏聚于晶界处,降低了晶内弱钉扎点的数量,且时效降温过程中,由于基体与析出相热膨胀系数的差异,导致产生新的位错,增大了位错密度,使阻尼性能进一步提高.该合金室温阻尼机制可用G-L位错钉扎模型解释.
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| 关 键 词： | 镁合金 AZ80 阻尼性能 G-L理论 |
Influece of Microstructure on Damping Properties of Wrought AZ80 Magnesium Alloy |
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| YAN Feng,GAO Feng,QUAN Gao-feng.Influece of Microstructure on Damping Properties of Wrought AZ80 Magnesium Alloy[J].Journal of Dalian Railway Institute,2010(3):63-66. |
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| Authors: | YAN Feng GAO Feng QUAN Gao-feng |
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| Institution: | YAN Feng,GAO Feng,QUAN Gao-feng(Liaoning Key Materials Laboratory for Railway Industry,Dalian Jiaotong University,Dalian 116028,China) |
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| Abstract: | The microstructures of as-extruded, solution treatment and aging AZ80 magnesium alloy were ob- served by optical microscope, scanning electron microscope, and transmission electron microscope, and the damping capacity of the AZ80 in different states was investigatied by dynamic mechanical analyzer. The exper- imental results show that the AZ80 alloy recrystallizes during the extrusion deformation, and the solution treat- ment at 410℃ for lh decreases the amount of the strong pinners, makes the Q-1 larger, and the aging at 170℃ for 18 h increases the Q-1 further. The influence of precipitation on damping behaviour is explained in the framework of the dislocation string model of Granato and Lticke. |
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| Keywords: | magnesium alloy AZ80 damping capacity Granato-Lticke theory |
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