Iron-Rich Phase Morphology Characteristics for Al-Si Alloy by Mn Addition and Melt Holding

被引：0
|
作者：
Song D. [1 ]
Wang S. [1 ]
Zhou N. [1 ]
Xu J. [1 ]
Zheng K. [1 ]
机构：
[1] Guangdong Institute of Materials and Processing, Guangzhou
来源：
Wang, Shuncheng (wangsunceng@163.com) | 2017年 / Editorial Office of Chinese Journal of Rare Metals卷 / 41期
关键词：
Al-Si alloy; Formation mechanism; Iron-rich phase; Melt holding;
D O I：
10.13373/j.cnki.cjrm.XY16032301
中图分类号：
学科分类号：
摘要：
1.2.% Mn(mass fraction) was added in A356 aluminum alloy which contained 1.0% iron(mass fraction), then the temperature of the metal melt was decreased to 615~680℃ and held for 1 h after melting at 850℃. The effects of melt holding temperature on the morphology of iron-rich phase for Al-Si alloy were investigated by optical microscope(OM), scanning electron microscope(SEM), energy disperse spectroscopy (EDS)and other modern research tools, and the formation mechanism of iron-rich phase was also discussed. The results showed that, with the decrease of holding temperature, refinement effect of alloy microstructure and uniformity of iron-rich phase were improved gradually. The evolution sequence of iron-rich phase morphology with holding temperature was: star+fine-mesh→polygon (4~6)+Chinese script→polygon (3-4)+Chinese script+fine mesh→polygon (fine)+Chinese script→Chinese script. (Mn, Fe)/Si ratio of iron-rich phase depended on its morphology, while Mn/Fe ratio depended primarily on the holding temperature. Moreover, the statistics data revealed that lower holding temperatures could reduce the content and size of iron-rich phase by 62.6% and 42.1% respectively, while the other iron-rich phase deposited in the bottom in the form of coarse and highly rounded polygon. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：739 / 744
页数：5
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