摘要
主要研究了稀土元素Ce和Nd对AZ91镁合金显微组织、显微硬度以及起燃温度的影响,结果表明:随着Nd、Ce添加量的增多,合金中层片状共晶相减少,块状析出相增多,这主要是由于稀土元素优先抢夺了合金中用于形成β相的铝元素而形成"Al-稀土"化合物造成的。AZ91合金的起燃温度和显微硬度并不随某一种或复合稀土元素含量的增加而单调变化,合金显微硬度与燃点间的关系也并非高低相对应,AZ91-3.0%Ce-1%Nd合金在两数据上达到了最佳的匹配,有较好的应用前景。
The effect of rare earth elements Ce and Nd on microstructure, microhardness and ignition point of AZ91 Magnesium alloy has been studied. The results showed that the lamellar eutectic phases reduced while massive precipitated phases increased with the increasing additions of Ce and Nd. This phenomenon can be attributed to the change of the combined elements with aluminum. The AI-rare earth compounds preempted parts of β-phases. The values of microhardness and ignition point of AZ91 alloy do not monotonically change with the additions of one or two rare earth elements. Moreover, it is not consistent between the alteration trends of microhardness and ignition point of AZ91 alloy. AZ91-3.0%Ce-1%Nd which is the optimal composition in the two kinds of evaluating data has prosperous application future.
出处
《中国铸造装备与技术》
CAS
2011年第4期8-11,共4页
China Foundry Machinery & Technology
基金
河北省自然科学基金青年科学基金项目(E2010000121)
关键词
镁合金
起燃温度
显微硬度
稀土
Mg alloy
Ignition point
Microhardness
Rare earth
