La对6063铝合金组织和时效性能的影响

张向宇; 熊计; 赵国忠; 赖人铭; 吴悦梅

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La对6063铝合金组织和时效性能的影响
Effects of Rare Earth La on Microstructure and Aging Characteristics of 6063 Aluminum Alloy
2008年第4期页码：316-318
纸质出版日期： 2008 ，
DOI：

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[1]张向宇,熊计,赵国忠,赖人铭,吴悦梅.La对6063铝合金组织和时效性能的影响[J].特种铸造及有色合金,2008(04):316-318+246.

Zhang Xiangyu, Xiong Ji, Zhao Guozhong, et al. Effects of Rare Earth La on Microstructure and Aging Characteristics of 6063 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2008,(4):316-318.
[1]张向宇,熊计,赵国忠,赖人铭,吴悦梅.La对6063铝合金组织和时效性能的影响[J].特种铸造及有色合金,2008(04):316-318+246. DOI：

Zhang Xiangyu, Xiong Ji, Zhao Guozhong, et al. Effects of Rare Earth La on Microstructure and Aging Characteristics of 6063 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2008,(4):316-318. DOI：

摘要

在6063合金中添加不同含量的La

用硬度（HB、HV）测试仪、差示扫描量热仪（DSC）、X射线衍射仪（XRD）和扫描电子显微镜（SEM）等方法研究了La对6063合金铸态组织、力学性能及时效行为的影响。结果表明

La对合金晶粒有明显的细化作用

添加适量的La有利于合金硬度和抗拉强度的提高

并且La的加入没有改变合金的析出顺序

但随着La含量的提高

La会消耗大量的Si

并在合金中形成粗大的AlFeSiLa化合物

抑制了中间沉淀析出相β″、β′析出

使强化相Mg2Si减少

反而使合金硬度和抗拉强度下降。

Abstract

Effects of different RE La additions on as-cast microstructure

mechanical properties

aging behavior and aging sequence of 6063 aluminum alloy have been investigated by hardness tester

DSC（differential scanning calorimetry）

XRD（X-ray diffraction） and SEM（scanning electron microscope）.It is found that the dendrite in alloy can be evidently refined and mechanical properties can be improved with proper La addition

meanwhile

the aging precipitation sequence can not be changed.However

mechanical properties of alloy can be obviously deteriorated with the increase of La addition

which is attributed to the creation of coarse AlFeSiLa compound restricting the precipitation of the β" and β’ phase and reduced Mg2Si phase.