Mathematical Description of AZ91D Semi-solid Structure under Stirring

Zhu Guanglei; Xu Jun; Zhang Zhifeng; Liu Guojun

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Mathematical Description of AZ91D Semi-solid Structure under Stirring
Vol. 30, Issue 4, Pages: 331-334(2010)
Published： 2010 ，
DOI：

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[1]朱光磊,徐骏,张志峰,刘国钧.搅拌作用下半固态AZ91D合金组织的数学描述[J].特种铸造及有色合金,2010,30(04):331-334+288.

Zhu Guanglei, Xu Jun, Zhang Zhifeng, et al. Mathematical Description of AZ91D Semi-solid Structure under Stirring. [J]. Special Casting & Nonferrous Alloys 30(4):331-334(2010)
[1]朱光磊,徐骏,张志峰,刘国钧.搅拌作用下半固态AZ91D合金组织的数学描述[J].特种铸造及有色合金,2010,30(04):331-334+288. DOI：

Zhu Guanglei, Xu Jun, Zhang Zhifeng, et al. Mathematical Description of AZ91D Semi-solid Structure under Stirring. [J]. Special Casting & Nonferrous Alloys 30(4):331-334(2010) DOI：

摘要

分析了搅拌速度和二次冷却速度对半固态AZ91D合金组织平均尺寸和形状因子的影响

将搅拌速度与二次冷却速度作为凝固组织演变的主要因素。分析发现

增加搅拌速度对细化初生相颗粒、提高颗粒圆整度是有利的;而提高冷却速度虽有利于细化晶粒

但不利于提高颗粒圆整度。应用多元非线性回归方法描述凝固组织随搅拌速度与二次凝固速率的关系建立了相关的本构方程

为获取理想凝固组织提供理论参考。

Abstract

Effects of stirring velocity and secondary cooling rate on average grain size and shape factors of AZ91D semi-solid slurry were investigated. Stirring velocities and secondary cooling rate are taken as the dominant factors influencing solidification structure evolution of semi-solid AZ91D alloy. The results reveal that increasing in stirring velocities is beneficial for the refinement of primary phase size and the improvement of the particle roundness

while increasing in secondary cooling rate is helpful for the refinement of the grain size but harmful for the particle roundness. Constitutive equations between solidification structure and stirring velocities as well as secondary cooling rate were presented on the basis of multiple non-linear regression method

providing a reference for preparing desirable semi-solid slurry.