Solid solution strengthening and damping capacity of Mg-Ga binary alloys
Solid solution strengthening and damping capacity of Mg-Ga binary alloys
复制标题
Mg-Ga二元合金的固溶强化和阻尼能力
DOI：
10.1016/s1003-6326(22)65988-0
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发表时间：
2022-09-01
影响因子：
4.5
通讯作者：
Zhu, Wei-jun
中科院分区：
文献类型：
--
作者：
Huang, Wen-sen;Chen, Ji-hua;Zhu, Wei-jun
采用光学显微镜（OM）、扫描电子显微镜（SEM）、X射线衍射仪（XRD）、硬度测试、拉伸试验和动态力学分析仪（DMA）研究了镓含量在1 - 5 wt.%范围内的二元Mg - Ga合金的力学行为和阻尼性能。硬度（HV0.5）随镓含量的增加而增大，可表示为HV0.5 = 41.61 + 10.35c，合金的固溶强化效果增量σs与cn呈线性关系，其中c为溶质原子的摩尔分数，n = 1/2或2/3。由于镓和镁原子之间的原子半径差异较大以及模量不匹配，镓比铝、锌或锡表现出更强的固溶强化效果。镓的加入使Mg - Ga合金具有更好的阻尼性能，这一现象可以用格拉纳托 - 卢克位错模型来解释。由于镓的加入产生的晶格畸变和模量不匹配增加了位错在摆动或移动过程中的运动阻力，从而获得了更好的阻尼性能。
The mechanical behaviors and damping capacities of the binary Mg-Ga alloys with the Ga content ranging from 1 to 5 wt.% were investigated by means of optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), hardness test, tensile test and dynamic mechanical analyzer (DMA). The hardness (HV0.5) increases with the increase of Ga content, which can be described as HV0.5=41.61+10.35c, and the solid solution strengthening effect increment sigma s of the alloy has a linear relationship with cn, where c is the molar fraction of solute atoms and n=1/2 or 2/3. Ga exhibits a stronger solid solution strengthening effect than Al, Zn or Sn due to the large atomic radius difference and the modulus mismatch between Ga and Mg atoms. The addition of Ga makes the Mg-Ga alloys have better damping capacity, and this phenomenon can be explained by the Granato-Lucke dislocation model. The lattice distortion and the modulus mismatch generated because of the addition of Ga increase the resistance to motion of the dislocation in the process of swinging or moving, and thus the better damping capacity is acquired.