液-固混合制备Al-18Si合金的组织及性能

张心龙; 李元东; 罗影; 周宏伟; 刘兴海

doi:10.15980/j.tzzz.2014.03.015

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液-固混合制备Al-18Si合金的组织及性能
Microstructure and Properties of Al-18Si Alloys by Liquid-Solid Mixing
2014年34卷第3期页码：260-263
纸质出版日期： 2014 ，
DOI： 10.15980/j.tzzz.2014.03.015

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[1]张心龙,李元东,罗影,周宏伟,刘兴海.液-固混合制备Al-18Si合金的组织及性能[J].特种铸造及有色合金,2014,34(03):260-263.

Zhang Xinlong, Li Yuandong, Luo Ying, et al. Microstructure and Properties of Al-18Si Alloys by Liquid-Solid Mixing[J]. Special Casting & Nonferrous Alloys, 2014,34(3):260-263.
[1]张心龙,李元东,罗影,周宏伟,刘兴海.液-固混合制备Al-18Si合金的组织及性能[J].特种铸造及有色合金,2014,34(03):260-263. DOI： 10.15980/j.tzzz.2014.03.015.

Zhang Xinlong, Li Yuandong, Luo Ying, et al. Microstructure and Properties of Al-18Si Alloys by Liquid-Solid Mixing[J]. Special Casting & Nonferrous Alloys, 2014,34(3):260-263. DOI： 10.15980/j.tzzz.2014.03.015.

摘要

采用受控扩散凝固技术（CDS）制备Al-18Si合金

研究了液-固混合方式下Al-25Si合金的温度对制备Al-18Si合金组织和性能的影响

探讨了合金的最终凝固组织与耐磨性能和热膨胀性能之间的关系。结果表明

在受控扩散凝固过程中

630℃固态纯Al与850℃液态Al-25Si合金混合所制备的Al-18Si合金中

初生Si相分布均匀

形貌规整

晶粒尺寸最小

耐磨性能最好。630℃固态纯Al和900℃液态Al-25Si合金混合制备的Al-18Si合金的线膨胀系数最小（15.51×10-6℃-1）。Al-18Si合金的耐磨性能主要取决于初生Si相的平均尺寸、形貌和分布。

Abstract

Effects of liquid-solid mixing and mixing temperature of Al-25Si alloy on the microstructure and properties as well as the relationship between microstructure with thermal expansion coefficient and wear resistance of Al-18Si alloy which was prepared by CDS（controlled diffusion solidification）were investigated.The results show that during the CDS

the desirable microstructure with uniformly distributed round primary Si phase can be observed with mixed solid pure-Al at 630℃ with liquid Al-25Si at 850 ℃alloy

and wear resistance of the alloy exhibits desirable.The lower linear expansion coefficient（15. 51×10-6℃-1 from 30℃to 300℃）of the Al-18Si alloy can be achieved by the mixing of pure-Al at 630 ℃and liquid Al-25Si at 900℃.The wear resistance of Al-18 alloy Si is mainly dependent on the size

morphology and distribution of primary silicon.