Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第8期    总第257期    2020年8月

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文章编号:1004-0609(2020)-08-1781-10
La对氟盐法制备Al-Ti-B-La反应机理及其细化效果的影响
付 莹1,付连生1,张宇博2,关 欣3,郭继宁1,马 征1,张 鹏1

(1. 渤海大学 工学院,锦州 121013;
2. 大连理工大学 材料科学与工程学院,大连 116085;
3. 锦州市检验检测认证中心,锦州 121013
)

摘 要: 利用氟盐法制备Al-5Ti-1B和Al-5Ti-1B-1La中间合金,对比分析稀土La添加对合成反应速率、第二相粒子的形态及物相组成的影响,并对比研究中间合金对纯铝和Al-8Si合金的细化效果。结果表明:添加稀土La元素会加速氟盐反应的进行,有利于Ti、B元素的吸收;稀土La可以有效地细化Al3Ti相,并与其反应生成细小弥散分布的Al20Ti2La相,同时减弱TiB2相聚集成团的倾向,在细化纯铝过程中表现出更优异的细化长效性;在细化Al-8Si合金过程中,Al-5Ti-1B-La中间合金中所存在的大量细小弥散的第二相形核粒子可以有效地细化铝基体,同时Al20Ti2La相熔解所释放的稀土La原子还可以对硅相产生变质细化作用,表现出较强的细化效果。

 

关键词: 稀土;晶粒细化;中间合金;Al-Ti-B-RE

Influence of La addition on reaction mechanism of Al-Ti-B-La refiner by halide salt route and its grain refining performance
FU Ying1, FU Lian-sheng1, ZHANG Yu-bo2, GUAN Xin3, GUO Ji-ning1, MA Zheng1, ZHANG Peng1

1. School of Engineering, Bohai University, Jinzhou 121013, China;
2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;
3. Inspection and Inspection Certification Center, Jinzhou 121013, China

Abstract:The Al-5Ti-1B and Al-5Ti-1B-La master alloys were synthesized by the fluorine salt method. The effects of rare earth La addition on the reaction rate and microstructural characteristics were investigated. The refining effect of Al-5Ti-1B-1La master alloy on the commercial-purity aluminum (CPAl) and Al-8Si alloy was also studied. The La addition can improve the fluorine salt reaction, as well as the Ti content in master alloy. La element is beneficial to refine the Al3Ti grains, by means of forming homogeneous Ti2Al20La compound, and also to reduce the agglomeration of TiB2 particles. Hence, the grain refining effectiveness for Al-5Ti-1B-1La master alloy could be maintained for a long time during the CPAl refinement process. The Al-5Ti-1B-1La master alloy has a refinement effect not only on the Al matrix, but also on the eutectic Si. The rare earth atoms released from the master alloy can inhibit the growth of Si in Al-8Si alloy.

 

Key words: rare earths; grain refinement; master alloy; Al-Ti-B-RE

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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