Effects of Pouring Temperature on Microstructure of Semi-Solid Al-25Si Alloy Fabricated by Rotating-Rod Induced Nucleation Method

Li Yongkun; Li Lu; Zhou Rongfeng; Chen Zongbao; Jiang Yehua; Zhou Rong

doi:10.15980/j.tzzz.2015.09.014

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Effects of Pouring Temperature on Microstructure of Semi-Solid Al-25Si Alloy Fabricated by Rotating-Rod Induced Nucleation Method
Vol. 35, Issue 9, Pages: 944-947(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.09.014

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[1]李永坤,李璐,周荣锋,陈宗宝,蒋业华,周荣.浇注温度对转棒诱导形核法制备Al-25Si合金半固态组织的影响[J].特种铸造及有色合金,2015,35(09):944-947.

Li Yongkun, Li Lu, Zhou Rongfeng, et al. Effects of Pouring Temperature on Microstructure of Semi-Solid Al-25Si Alloy Fabricated by Rotating-Rod Induced Nucleation Method. [J]. Special Casting & Nonferrous Alloys 35(9):944-947(2015)
[1]李永坤,李璐,周荣锋,陈宗宝,蒋业华,周荣.浇注温度对转棒诱导形核法制备Al-25Si合金半固态组织的影响[J].特种铸造及有色合金,2015,35(09):944-947. DOI： 10.15980/j.tzzz.2015.09.014.

Li Yongkun, Li Lu, Zhou Rongfeng, et al. Effects of Pouring Temperature on Microstructure of Semi-Solid Al-25Si Alloy Fabricated by Rotating-Rod Induced Nucleation Method. [J]. Special Casting & Nonferrous Alloys 35(9):944-947(2015) DOI： 10.15980/j.tzzz.2015.09.014.

摘要

采用转棒诱导形核法制备Al-25Si半固态浆料

研究了浇注温度对合金半固态浆料组织的影响

结合熔体运动状态探讨了其组织细化机理。结果表明

当浇注温度约为785℃时

熔体在转棒表面铺展成面积最大、厚度最小的熔体薄膜

可以获得尺寸细小、均匀分布于基体中的初生Si颗粒

初生Si颗粒的等效直径约为27μm

形状因子为0.8。

Abstract

The rotating-rod induced nucleation（RRIN）was adopted to fabricate semi-solid slurry of Al-25 Si alloy.The influence of pouring temperature on microstructure of Al-25 Si aluminum alloy semi-solid slurry was analyzed

and the refining mechanism of microstructure was expounded based on to the motion of melt on the surface of rotating-rod.The results show that a melt film with the largest spreading area and the thinnest thickness on the rod surface can be obtained shortly

and fine sized primary Si particles evenly distributed in the matrix can be observed with the pouring temperature approximately 785℃.The equivalent diameter of the primary Si particles is about 27μm with shape factor of 0.8.