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Microstructural evolution of ternary Ag33Cu-42Ge25 eutectic alloy inside ultrasonic field

Microstructural evolution of ternary Ag33Cu-42Ge25 eutectic alloy inside ultrasonic field

作     者:Wei Zhai Xiaoyu Lu Bingbo Wei 

作者机构:Department of Applied Physics Northwestern Polytechnical University 

出 版 物:《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期:2014年第24卷第5期

页      面:642-648页

核心收录:

学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:financially supported by National Natural Science Foundation of China(nos:51327901,51271150,51201136 and 51171153) Natural Science Foundation of Shaanxi Province(2013JQ6011) Doctoral Fund of Ministry of Education(no:20126102120059) Aviation Science Foundation of China(no:2012ZF53069) Fundamental Research Fund of Northwestern Polytechnical University(Grant no.JCQ01091) NPU Excellent Personnel Supporting Project of Ao Xiang New Star 

主  题:Dynamic solidification Cavitation effect Ternary alloy Nucleation Eutectic growth 

摘      要:Ultrasonic field with a frequency of 20 k Hz is introduced into the solidification process of ternary Ag33Cu42Ge25 eutectic alloy from the sample bottom to its top. The ultrasound stimulates the nucleation of alloy melt and prevents its bulk undercooling. At low ultrasound power of 250 W,the primary ε2phase in the whole alloy sample grows into non-faceted equiaxed grains, which differs to its faceted morphology of long strip under static condition. The pseudobinary(Ag t ε2) eutectic transits from dendrite shape grain composed of rod type eutectic to equiaxed chrysanthemus shape formed by lamellar structure. By contrast, the ultrasound produces no obvious variation in the morphology of ternary(Ag t Ge t ε2) eutectic except a coarsening effect. When ultrasound power rises to 500 W, divorced ternary(Ag t Ge t ε2) eutectic forms at the sample bottom. However, in the upper part, the ultrasonic energy weakens, and it only brings about prominent refining effect to primary ε*** microstructural evolution mechanism is investigated on the cavitation, acoustic streaming and acoustic attenuation.

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