Preparation of Semi-Solid 7075Aluminum Alloy Slurry by a Serpentine Pouring Channel

Zhu Wenzhi; Mao Weimin; Yang Bin; Song Xiaojun

doi:10.15980/j.tzzz.2013.02.011

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Preparation of Semi-Solid 7075Aluminum Alloy Slurry by a Serpentine Pouring Channel
Vol. 33, Issue 2, Pages: 145-148(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.02.011

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[1]朱文志,毛卫民,杨斌,宋晓俊.蛇形通道浇注制备7075铝合金半固态浆料[J].特种铸造及有色合金,2013,33(02):145-148.

Zhu Wenzhi, Mao Weimin, Yang Bin, et al. Preparation of Semi-Solid 7075Aluminum Alloy Slurry by a Serpentine Pouring Channel. [J]. Special Casting & Nonferrous Alloys 33(2):145-148(2013)
[1]朱文志,毛卫民,杨斌,宋晓俊.蛇形通道浇注制备7075铝合金半固态浆料[J].特种铸造及有色合金,2013,33(02):145-148. DOI： 10.15980/j.tzzz.2013.02.011.

Zhu Wenzhi, Mao Weimin, Yang Bin, et al. Preparation of Semi-Solid 7075Aluminum Alloy Slurry by a Serpentine Pouring Channel. [J]. Special Casting & Nonferrous Alloys 33(2):145-148(2013) DOI： 10.15980/j.tzzz.2013.02.011.

摘要

采用蛇形通道浇注制备7075铝合金半固态浆料

研究了浇注温度、弯道数量和弯道直径对7075铝合金半固态浆料组织的影响。结果表明

当浇注温度为660～675℃时

可以制备出质量较好的7075铝合金半固态浆料

且管道内挂料较少;在相同温度条件下

随着弯道数量增加或弯道直径减小

初生α-Al的平均晶粒尺寸减小、形状因子提高。在制备7075铝合金半固态浆料过程中

合金熔体在具有一定弧度且封闭的蛇形弯道内流动并多次改变流动方向

具有类似"搅拌"功能

使得初生晶核逐渐演变为球形或近球形晶粒。

Abstract

The semi-solid slurry of 7075aluminum alloy was prepared through a serpentine pouring channel

and influences of pouring temperature

the curve numbers and the curve diameters in the serpentine channel on the microstructure of semi-solid 7075alloy slurry were investigated.The results demonstrate that the semi-solid 7075aluminum alloy slurry with satisfied quality can be generated by a serpentine pouring channel and the solid shell inside the channel can be avoided with the pouring temperature in the range of 660℃～675℃.With a given pouring temperature

the equivalent size of the primary α-Al grains is decreased and the shape factor is increased with the increase of the curve numbers or the decrease of the curve diameters.During the slurry preparation of semi-solid 7075aluminum alloy

the alloy melt changes flow direction many times when it flows in a curved and closed serpentine channel

which result in the primary nuclei gradually evolving into spherical and near-spherical grains as a result of the effect of"stirring" in the serpentine curve.