Damping Capacities of Porous Mg–based Ternary Alloys Prepared by a Stir–casting Method,ChemistrySelect

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Damping Capacities of Porous Mg–based Ternary Alloys Prepared by a Stir–casting Method
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-06-08 , DOI: 10.1002/slct.201800159
Yun-si Wang _{1,

2,

3} , Rui-long Niu _{3,

4} , Fang-jia Yan _{3,

4} , Dong-ping Duan _{1,

2,

4} , Xue-min Yang ₄

Affiliation

A new approach for preparing porous Mg–Al–Sr ternary alloys has been proposed using stir–casting method. Experimental results indicate that porosity and pore diameters have close relation with chemical composition of Mg–based ternary alloys. The proposed formation mechanism of pores in Mg–based ternary alloys can be described as that the oxidization reaction between [Sr] and O₂ in air provides enough heat source to vaporize small amount of Mg–based ternary alloys, while the vaporized products promote formation of embodied pores with various sizes and shapes in Mg–based ternary alloys during solidification process. Meanwhile, some oxides in shape of sheets will be formed and precipitated, while other oxides will also be precipitated on surface of pore wall during cooling. Moreover, the measured damping capacities expressed by internal friction tan δ indicate that changing temperature from ambient temperature to 343 K cannot cause a large effect on damping capacities, however the inverse V–shape plots of damping capacities against temperature from 343 to 573 K are obtained. In addition, increasing vibration frequencies can result in a decrease of internal friction tan δ. The optimized chemical composition as 50%Mg–47%Al–3%Sr and 50%Mg–45%Al–5%Sr are recommended for Mg–based ternary alloys with greater porosity and higher damping performance under temperature and vibration frequency.

中文翻译：

搅拌铸造法制备的多孔镁基三元合金的阻尼能力

提出了一种采用搅拌铸造法制备多孔Mg-Al-Sr三元合金的新方法。实验结果表明，孔隙率和孔径与Mg基三元合金的化学组成密切相关。镁基三元合金中孔的形成机理可以描述为[Sr]与O ₂之间的氧化反应空气中的热源提供了足够的热量来蒸发少量的Mg基三元合金，而汽化产物则促进了凝固过程中Mg基三元合金中各种尺寸和形状的微孔的形成。同时，在冷却过程中，一些片状的氧化物将形成并沉淀，而其他氧化物也将在孔壁的表面上沉淀。此外，通过内摩擦黄褐色表示所测量的阻尼性能 δ表示改变从环境温度的温度至343 K可不会造成大的影响上阻尼性能，但是从343至573K的阻尼性能对温度的获得的倒V形状图解。另外，增加的振动频率可导致内摩擦tanδ的下降 δ。对于在温度和振动频率下具有更大孔隙率和更高阻尼性能的Mg基三元合金，建议将化学成分优化为50％Mg–47％Al–3％Sr和50％Mg–45％Al–5％Sr。

更新日期：2018-06-08

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