摘要
目前核/壳结构难混熔合金的壳是由低熔点相组成还是高熔点相组成,尚无确切答案。根据文献中Cu-Sn-Pb合金的计算相图,通过铸造法研究14Sn-73.1Cu-12.9Pb、14Sn-64.5Cu-21.5Pb、Cu-65Pb和Cu-75Pb合金的相分离过程。结果表明,14Sn-64.5Cu-21.5Pb合金具有富Cu-Sn相包裹富Pb相核/壳结构组织;这一结果与低熔点相(如Cu-75Pb合金)形成核的观点不一致,这种异常现象可以解释为:在铸造过程中,由于过冷度的影响,偏晶反应发生在液相分离反应前。这为通过控制凝固路径改变难混熔合金的结构提供了一种可能的方法。
For the core-shell structured immiscible alloys within the immiscible gap,whether the shell is composed of a phase with lower or higher melting point,has no exact answer yet.Based on the Cu-Sn-Pb calculated phase diagram given by reference,the phase separation of 14Sn-73.1Cu-12.9Pb,14 Sn-64.5Cu-21.5 Pb,Cu-65Pb and Cu-75Pb alloys have been experimentally investigated by casting method.An anomalous core-shell structure with a CuSn-rich shell and a Pb-rich core forms in 14Sn-64.5Cu-21.5Pb alloy,which differs from the viewpoint that a lower melting point phase generally forms the shell as Cu-75Pb alloy shows.This anomalous phenomenon may be explained by the fact that the liquid separation reaction is suppressed due to undercooling generated during casting process and the monotectic reaction takes place before the liquid separation reaction.This work may provide a method to modify the structure of immiscible alloys through controlling the solidification path.
作者
李建强
孙虹
马炳倩
Li Jianqiang;Sun Hong;Ma Bingqian(National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第2期461-464,共4页
Rare Metal Materials and Engineering
基金
National Key Research and Development Program of China(2017YFC0703205)
National Natural Science Foundation of China(51274182)
Instrument Developing Project of the Chinese Academy of Sciences(YZ201520)
Strategic Priority Research Program of the Chinese Academy of Sciences(XDA15013500)
“Transformational Technologies for Clean Energy and Demonstration”,Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21070302)。
关键词
凝固
金属和合金
核/壳结构
solidification
metals and alloys
core-shell structure
作者简介
李建强,男,1975年生,博士,研究员,中国科学院过程工程研究所,北京100190,电话:010-82544953,E-mail:jqli@ipe.ac.cn。
