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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第4期    总第194期    2010年8月

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文章编号:1672-7207(2010)04-1297-06
Zn-Cu-Mg-Al-RE锌合金的显微组织与切削性能
林高用1, 2,曾菊花1,郑小燕1,杨伟1,邹艳明1

(1. 中南大学 材料科学与工程学院,湖南 长沙,410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室,湖南 长沙,410083
)

摘 要: 采用金相组织分析、X线衍射物相分析、扫描电镜和能谱分析技术对自行研制的Zn-Cu-Mg-Al-RE锌合金(拟取代HPb59-1黄铜)在铸态、挤压态和热处理态3种状态下的显微组织与切削性能进行研究,并比较3种状态Zn-Cu-Mg-Al-RE合金与HPb59-1黄铜的切削性能。研究结果表明:铸态Zn-Cu-Mg-Al-RE锌合金中主要含有纯Zn相、Mg2Zn11相和Cu4Zn相(ε相),且晶间有不连续分布的块状稀土化合物,该稀土化合物性脆易断,有利于提高合金的切削性能;挤压态合金的晶界不明显,稀土化合物消失,基体组织发生再结晶;热处理后,合金发生二次再结晶,晶粒细化,ε相大量析出,强度和塑性均有所提高;与铸态相比,挤压态及热处理态Zn-Cu-Mg-Al-RE合金的切削性能略有下降;铸态Zn-Cu-Mg-Al-RE合金的切削性能已接近HPb59-1黄铜的切削性能。

 

关键字: 锌合金;稀土;显微组织;切削性能

Microstructure and machinability of Zn-Cu-Mg-Al-RE zinc alloy
LIN Gao-yong1, 2, ZENG Ju-hua1, ZHENG Xiao-yan1, YANG Wei1, ZOU Yan-ming1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. The Key Laboratory of Nonferrous Metal Materials Science and Engineering,
Ministry of Education, Central South University, Changsha 410083, China

Abstract:The microstructure and machinability of a self-developed Zn-Cu-Mg-Al-RE zinc-based alloy (to replace HPb59-1 brass) under the cast, heat-treated and extruded conditions were investigated by optical microscope analysis, X-ray diffractrometry analysis, scanning electron microscope observation and energy spectrum analysis. The machinabilities of Zn-Cu-Mg-Al-RE zinc-based alloy under the three conditions were compared with that of HPb59-1 brass. The results show that the white massive structure which is rare earth compound and of brittleness, distributing at grain boundaries discontinuously under the cast condition, is helpful for cutting, but it disappears under the extruded and heat-treated conditions. The matrix structure recrystallizes after extruded, and secondary recrystallization which refines the grain can be observed in the alloy after heat-treated. The machinability of the as-cast alloy is close to that of HPb59-1 alloy, and it is higher than those of as-heat-treated and as-extruded alloys.

 

Key words: zinc alloy; rare earth; microstructure; machinability

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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