Ce对Mg-Li-Al合金组织及力学性能的影响

刘滨; 张密林

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Ce对Mg-Li-Al合金组织及力学性能的影响
Effects of Ce on Microstructure and Mechanical Properties of Mg-Li-Al Alloy
2007年第5期页码：329-331
纸质出版日期： 2007 ，
DOI：

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[1]刘滨,张密林.Ce对Mg-Li-Al合金组织及力学性能的影响[J].特种铸造及有色合金,2007(05):329-331+323.

Liu Bin, Zhang Milin. Effects of Ce on Microstructure and Mechanical Properties of Mg-Li-Al Alloy[J]. Special Casting & Nonferrous Alloys, 2007,(5):329-331.
[1]刘滨,张密林.Ce对Mg-Li-Al合金组织及力学性能的影响[J].特种铸造及有色合金,2007(05):329-331+323. DOI：

Liu Bin, Zhang Milin. Effects of Ce on Microstructure and Mechanical Properties of Mg-Li-Al Alloy[J]. Special Casting & Nonferrous Alloys, 2007,(5):329-331. DOI：

摘要

研究了Ce对Mg-16Li-5Al合金铸态组织及力学性能的影响。结果表明

加入Ce后

晶粒细化

随稀土化合物Al2Ce的增加

Mg17Al12、AlLi两相减少;Ce的加入提高了合金的强度和耐热性能

大量Al2Ce的存在

易割裂基体

使强度降低;分布在晶界附近的稀土化合物改变了合金的断裂方式。

Abstract

The effects of Ce content on microstructure and mechanical properties of Mg-16Li-5Al alloy were investigated by OM

SEM and testing. The results show that the Ce addition results in the refinement of grain size in the alloy and the decrease of Mg12Al17 and AlLi phase due to the increase of RE compound Al2Ce. Meanwhile

its addition can improve the strength and high temperature properties

however

the amounts of Al2Ce exists in and around the grain boundary can lead to the fracture of matrix in the process of tensile

which is responsible for the deterioration of strength. The fracture characteristics of the alloy is controlled by the RE compound Al2Ce generated around the grain boundary.