不同凝固条件下Al4Sr相的形貌特征演变

doi:10.12068/j.issn.1005-3026.2016.03.007

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (3): 333-337.DOI: 10.12068/j.issn.1005-3026.2016.03.007

不同凝固条件下Al₄Sr相的形貌特征演变

李磊，许斯洋，张海涛，崔建忠

(东北大学材料电磁过程研究教育部重点实验室，辽宁沈阳110819)

收稿日期:2014-07-22 修回日期:2014-07-22 出版日期:2016-03-15 发布日期:2016-03-07
通讯作者: 李磊
作者简介:李磊(1979-)，男，河北保定人，东北大学讲师，博士; 崔建忠(1950-)，男，黑龙江双城人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51201029，51204046)；中央高校基本科研业务费专项资金资助项目(N130409002，N130409003)；中国博士后科学基金资助项目(2015M570250).

Evolution of Morphological Character of Al₄Sr Phase Under Different Solidification Conditions

LI Lei， XU Si-yang， ZHANG Hai-tao， CUI Jian-zhong

Key Laboratory of Electromagnetic Processing of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China.

Received:2014-07-22 Revised:2014-07-22 Online:2016-03-15 Published:2016-03-07
Contact: LI Lei
About author:-
Supported by:
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摘要/Abstract

摘要： 以Al-20Sr合金为研究对象，采用浇铸和吸铸两种方式制备了中间合金，利用扫描电镜系统考察了不同凝固条件下初生Al₄Sr相的形貌特征演变.结果表明:850℃浇铸时，Al₄Sr相呈规则且完整的块状形貌，950℃浇铸时Al₄Sr相呈长条状，具有明显的择优晶体学生长特征(择优晶体学生长方向<100>)；升温至850℃吸铸时，试样中心和边部的Al₄Sr相均呈较规则且完整的块状形貌，升温至900，950℃，降温至900℃吸铸时，试样中心Al₄Sr相主要呈细长条竹节状，边部呈短条或椭圆状，降温至850，800℃吸铸时中心呈粗大和细小条状两种形貌，降温至750℃吸铸时为粗大的条状.凝固条件对Al₄Sr相的形貌有重要影响.

关键词: Al-Sr中间合金, 浇铸, 吸铸, Al₄Sr相, 形貌特征

Abstract: Al-20 Sr intermediate alloys were prepared by both mold and suction castings. The morphological evolution of the primary Al₄Sr phase under different solidification conditions was investigated by SEM. The results showed that in the mold cast specimens the primary Al₄Sr phases are regular and complete block-like shape at 850℃ and are strip-like form with obvious preferential crystallographic growth character at 950℃. In the suction cast specimens， the primary Al₄Sr phases are regular and complete block-like shape when the temperature is increased to 850℃， fine bamboo-like shapes in the central and short strip-like and elliptical forms in the peripheral regions when the temperatures are increased to 900℃ and 950℃ and then decreased to 900℃， coarse and fine stripe-like shapes when the temperatures are decreased to 850℃ and 800℃， and coarse stripe-like forms when the temperature is decreased to 750℃， respectively. In summary， solidification conditions have important influence on the morphologies of Al₄Sr phase.

Key words: Al-Sr intermediate alloy, mold casting, suction casting, Al₄Sr phase, morphological character

中图分类号:

TF821
TG292

李磊，许斯洋，张海涛，崔建忠. 不同凝固条件下Al₄Sr相的形貌特征演变[J]. 东北大学学报:自然科学版, 2016, 37(3): 333-337.

LI Lei， XU Si-yang， ZHANG Hai-tao， CUI Jian-zhong. Evolution of Morphological Character of Al₄Sr Phase Under Different Solidification Conditions[J]. Journal of Northeastern University Natural Science, 2016, 37(3): 333-337.

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不同凝固条件下Al₄Sr相的形貌特征演变

Evolution of Morphological Character of Al₄Sr Phase Under Different Solidification Conditions

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