摘要
采用粉末冶金法制备了Mg-x%Zr阻尼合金(x=0.6,1.5,2.5,5,质量分数,下同),通过三点弯曲测试和DMA技术等手段研究了Zr含量对Mg-Zr合金的组织、力学性能和阻尼性能的影响。结果表明,随着Zr含量增加,组织演变为条带状结构,同时在晶界及晶内出现点状颗粒,晶粒更加细化。Mg-x%Zr阻尼合金的致密度、硬度、抗弯强度随着Zr含量增加而提高,Zr含量为2.5%的合金的致密度、抗弯强度和显微硬度达到最大值。在频率5Hz,应变振幅6×10-5的测试条件下,Mg-5%Zr合金的阻尼性能最好,阻尼值tan达到0.084,Mg-1.5%Zr次之,Mg-2.5%Zr合金的阻尼性能最差。在27～100℃的温度范围内,Mg-x%Zr合金阻尼性能随温度升高而缓慢提高,在高于100℃后,合金阻尼性能随温度的升高迅速增加,并在160℃出现阻尼峰。Mg-1.5%Zr合金的阻尼峰温度随频率增大而升高,呈现出弛豫型阻尼特征。
Mg-x/% Zr damping alloys（x=0.6,1.5,2.5,5,mass fraction/% the same below） were prepared by PM（powder metallurgy） technology,and effects of Zr contents on microstructure,mechanical properties and damping capacities of Mg-x%Zr damping alloys were researched by three-point bending test and DMA,etc.The results show that the microstructure become into strip-shaped morphology,more granular particles appear in the grain boundaries or inside grains,and the grains are more refined with the increase of Zr additions.Relative density,micro-hardness and bending strength of the Mg-xZr damping alloys increase with increasing addition of Zr,and reach the maximum value with Zr addition of 2.5%.Under the testing conditions of 5 Hz frequency and 6×10-5 strain amplitude,Mg-5%Zr alloy exhibits the highest damping capacity with tan value reaches to 0.084,the Mg-1.5%Zr alloy is next,and Mg-2.5%Zr alloy has the worst damping capacity.The damping capacities of Mg-xZr alloys increase slowly with the temperature from 27℃ to 100℃,and increase rapidly above 100℃.The damping peaks appear at temperature of 160℃.The temperature of the damping peak of Mg-1.5%Zr alloy increases with increasing frequencies,showing the characteristic of relaxation damping.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第5期12-17,共6页
Journal of Aeronautical Materials
基金
江苏省科技支撑计划项目(BE2010103)
江苏省自然科学基金(BK2009577)
常熟市工业攻关项目(CC200913)
