| 快速凝固高硅铝合金粉末的热挤压过程 |
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| 引用本文： | 张大童,李元元,罗宗强,邱诚. 快速凝固高硅铝合金粉末的热挤压过程[J]. 中国有色金属学报, 2001, 11(1): 6-9 |
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| 作者姓名： | 张大童 李元元 罗宗强 邱诚 |
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| 作者单位： | 华南理工大学 机电工程系, |
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| 基金项目： | 国家自然科学基金资助项目(59875019) |
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| 摘 要： | 通过分析快速凝固高硅铝合金末在热挤压过程中的密度、微观组织和相结构的变化，对粉末热挤压成形机理进行了探讨，结果表明，快速凝固高硅铝合金粉末热压过程分为2个阶段，即填充挤压阶段和稳态渡动阶段，粉末生坯的致密化主要有在第一阶段完成，粉末颗粒中初晶Si相受到加热长大和挤压破碎两方面的综合作用，最终得到的挤压材料中的Si颗粒与原始粉末相比没有明显的相比，合金的相组成在挤压前后 有发生变化，快速凝固合 组织结构特征基本得以保留。
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| 关 键 词： | 快速凝固 高硅铝合金 热挤压 粉末冶金 粉末挤压 |
| 文章编号： | 1004-0609(2001)01-0006-04 |
| 修稿时间： | 2000-04-10 |
Hot extrusion process ofrapidly solidified hypereutectic aluminum-silicon alloy powder |
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| ZHANG Da-tong,LI Yuan-yuan,LUO Zong-qiang,Qiu Cheng. Hot extrusion process ofrapidly solidified hypereutectic aluminum-silicon alloy powder[J]. The Chinese Journal of Nonferrous Metals, 2001, 11(1): 6-9 |
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| Authors: | ZHANG Da-tong LI Yuan-yuan LUO Zong-qiang Qiu Cheng |
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| Abstract: | By analyzing the changes of the density, microstructures and phase during the hot extrusion process of rapidly solidified (RS) hypereutectic aluminum silicon powder, the mechanism of powder hot extrusion was studied. Experimental results show that the powder hot extrusion process can be divided into two stages, hot compress process and stable flow process. The density of the billet increases greatly at the first process. Two effects decide the primary silicon particle size: growing due to heating and breaking due to extrusion. However, no change of phase is detected after hot extrusion, and the powder's RS characteristics remain unchanged. [ |
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| Keywords: | rapid solidification hypereutectic Al Si alloy hot extrusion |
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