新工艺制备半固态A356铝合金浆料

金属学报

2009, Vol. 45

Issue (4): 507-512

论文

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新工艺制备半固态A356铝合金浆料

刘政^1;2;毛卫民²;赵振铎²

1. 江西理工大学材料与化学工程学院; 赣州 341000
2. 北京科技大学材料科学与工程学院; 北京 100083

SEMI–SOLID A356 ALLOY SLURRY PREPARED BY A NEW PROCESS

LIU Zheng ^1;2; MAO Weimin ²; ZHAO Zhenduo ²

1. School of Material and Chemistry Engineering; Jiangxi University of Science and Technology; Ganzhou 341000
2. School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083

引用本文:

刘政毛卫民赵振铎. 新工艺制备半固态A356铝合金浆料[J]. 金属学报, 2009, 45(4): 507-512.
, , . SEMI–SOLID A356 ALLOY SLURRY PREPARED BY A NEW PROCESS[J]. Acta Metall Sin, 2009, 45(4): 507-512.

全文: PDF(3188 KB)

摘要:

提出了在电磁搅拌制备半固态A356铝合金浆料时插拔Cu棒的一个新工艺. 由于在半固态铸锭轴向区域引入低温, 可进一步提高电磁搅拌效果, 铸锭各部位均由细小α--Al晶粒组成. 该工艺还可适当提高低过热度浇注的温度而有利于实际生产.

关键词 ： A356合金, 半固态, Cu棒搅拌, 电磁搅拌

Abstract：

Because of the solidifying characteristic of alloy and the difference in thermal conductivity of mould, the microstructures of different zones of semi–solid slurry are different, which is hard to satisfy the requirement of rheoforming. A new process preparing semi–solid slurry is proposed, in which a locally rapid cooling near the center zone of mould can be realized by inserting a copper rod into the slurry and then pulling out repeatedly, except application of a weakly electromagnetic stirring. Semi–solid A356 alloy slurry was prepared by the new process and the effects of the new process on morphology and size of primary α–Al in semi–solid A356 were researched. The results indicate that the nucleation rate, morphology and grain size of primary α–Al are markedly improved by the new process. Primary α–Al with small size presents particle–like or globular–like and distributes uniformly in the slurry even at lower overheating. The grain refining and structural homogeneity are relative to homogenization of the temperature field in the mould.

Key words： A356 alloy semi--solid slurry copper rod stirring electromagnetic stirring

收稿日期: 2008-08-20

ZTFLH:

TG146

基金资助:

国家自然科学基金项目50374012和江西省自然科学基金项目0650047资助

作者简介: 刘政, 男, 1958年生, 教授, 博士

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