Effects of solid solution elements on damping capacities of binary magnesium alloys

Effects of solid solution elements on damping capacities of binary magnesium alloys
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固溶元素对二元镁合金阻尼性能的影响

DOI:
10.1016/j.msea.2019.138707
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发表时间:
2020-01
影响因子:
6.4
通讯作者:
Song Min
Song Min
中科院分区:
材料科学1区
文献类型:
--
作者:
Yu Lang;Yan Hongge;Chen Jihua;Xia Weijun;Su Bin;Song Min

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以纯Mg为对照,研究了固溶体元素对4种晶粒尺寸相近的Mg-1at%X(X = Zn,Sn,Ga,Al)二元合金阻尼性能的影响。固溶体合金的应变振幅无关阻尼能力随着溶质原子引起的晶格畸变的增大而降低,而屈服强度则相反。晶格畸变、层错能和溶质原子与Mg原子的混合焓是影响应变振幅相关阻尼的主要因素,其中层错能起主导作用。在室温下,Mg-1at%Sn合金具有最高的与应变幅无关的阻尼性能,而Mg-1at%Al合金具有最好的与应变幅相关的阻尼性能。当温度升高到100 °C左右时,晶格畸变程度最大的Mg-1at%Zn合金具有最佳的应变振幅无关阻尼。这可能与热激活引起位错弯曲的动力学力增加有关。
Effects of solid solution elements on damping capacities of four Mg-1at%X binary alloys (X = Zn, Sn, Ga, Al) with similar grain sizes are carefully investigated with pure Mg as comparison. The strain-amplitude-independent damping capacity of the solid solution alloy decreases with the higher lattice distortion caused by solute atoms, while the yield strength is just the opposite. The strain-amplitude-dependent damping capacity is affected by the lattice distortion, the stacking fault energy and the mixing enthalpy between solute atoms and Mg atoms, while the stacking fault energy is the dominant. The Mg-1at%Sn alloy exhibits the highest strain-amplitude-independent damping capacity, while the Mg-1at%Al alloy has the best strain-amplitude-dependent damping capacity at room temperature. When the temperature rises to about 100 °C, the Mg-1at%Zn alloy with the largest lattice distortion degree has the best strain-amplitude-independent damping. This may be related to the increase of the dynamic force for dislocation bowing caused by thermal activation.
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