Lu Ruopeng, Jiao Kai, Zhao Yuhong, Li Kun, Yao Keyu, Hou Hua
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Materials (Basel). 2020 Oct 19;13(20):4654. doi: 10.3390/ma13204654.
Magnesium alloys are concerned for its mechanical properties and high damping performance. The influence of Mn toward the internal organization morphology of long-period stacking ordered (LPSO) second phase and the consistent damping performance in Mg-4.9Zn-8.9Y-xMn have been studies in this work. It has shown that the addition of Mn tends to diffuse to the LPSO interface and causes the LPSO phase to expand in the arc direction. The circular structure of LPSO can optimize the damping property of the alloy better than the structure with strong orientation, especially at the strain of 10 and 250 °C. With more additions of Mn, damping would have a reduction due to the dispersed fine LPSO phases and α-Mn particles. When the Mn content is higher than 1.02%, the grain is refined, and mechanical properties have been significantly improved. Mg-4.9%Zn-8.9%Y-1.33%Mn shows the best mechanical property.
镁合金因其机械性能和高阻尼性能而受到关注。本工作研究了Mn对长周期堆垛有序（LPSO）第二相内部组织形态的影响以及在Mg-4.9Zn-8.9Y-xMn合金中相应的阻尼性能。结果表明，添加Mn倾向于扩散到LPSO界面，并导致LPSO相沿弧形方向扩展。LPSO的圆形结构比具有强取向的结构能更好地优化合金的阻尼性能，特别是在10%应变和250°C时。随着Mn添加量的增加，由于弥散的细小LPSO相和α-Mn颗粒，阻尼会降低。当Mn含量高于1.02%时，晶粒细化，机械性能得到显著改善。Mg-4.9%Zn-8.9%Y-1.33%Mn表现出最佳的机械性能。
