Microstructure and damping properties of LPSO phase dominant Mg-Ni-Y and Mg-Zn-Ni-Y alloys  

作　　者：Ruopeng Lu Kai Jiao Nanting Li Hua Hou Jingfeng Wang Yuhong Zhao 

机构地区：[1]College of Materials Science and Engineering,North University of China,Taiyuan 030051,China [2]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [3]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [4]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Journal of Magnesium and Alloys》2024年第3期1131-1153,共23页镁合金学报（英文）

基　　金：funded by the National Natural Science Foundation of China(Nos.51801189);The Central Guidance on Local Science and Technology Development Fund of Shanxi Province(Nos.YDZJTSX2021A027);The National Natural Science Foundation of China(Nos.51801189);The Science and Technology Major Project of Shanxi Province(No.20191102008,20191102007);The North University of China Youth Academic Leader Project(No.11045505).

摘　　要：This work studied the microstructure,mechanical properties and damping properties of Mg_(95.34)Ni_(2)Y_(2.66) and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloys systematically.The difference in the evolution of the long-period stacked ordered(LPSO)phase in the two alloys during heat treatment was the focus.The morphology of the as-cast Mg_(95.34)Ni_(2)Y_(2.66)presented a disordered network.After heat treatment at 773 K for 2 hours,the eutectic phase was integrated into the matrix,and the LPSO phase maintained the 18R structure.As Zn partially replaced Ni,the crystal grains became rounded in the cast alloy,and lamellar LPSO phases and more solid solution atoms were contained in the matrix after heat treatment of the Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloy.Both Zn and the heat treatment had a significant effect on damping.Obvious dislocation internal friction peaks and grain boundary internal friction peaks were found after temperature-dependent damping of the Mg_(95.34)Ni_(2)Y_(2.66)and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloys.After heat treatment,the dislocation peak was significantly increased,especially in the alloy Mg_(95.34)Ni_(2)Y_(2).66.The annealed Mg_(95.34)Ni_(2)Y_(2.66)alloy with a rod-shaped LPSO phase exhibited a good damping performance of 0.14 atε=10^(−3),which was due to the difference between the second phase and solid solution atom content.These factors also affected the dynamic modulus of the alloy.The results of this study will help in further development of high-damping magnesium alloys.

关 键 词：Mg-Ni-Y alloys Mg-Zn-Ni-Y alloys LPSO phase Heat treatment MICROSTRUCTURE Damping properties. 

分 类 号：TG146.22[一般工业技术—材料科学与工程]