计真琦,梁上上,文胜平,熊湘沅,魏午,黄晖

• 1:北京工业大学材料与制造学部

摘要(Abstract)：

通过显微硬度计、电导率测量仪和透射电镜等研究了添加不同含量的Si对Al-Er合金在不同温度下的时效行为及析出相微观结构的影响。结果表明：Si含量在0.15%和0.25%时，合金时效过程中无明显时效强化现象，Si含量为0.50%时合金时效强化效果最佳，275℃等温时效72 h时达到硬度峰值(约为40.3 HV0.1),随后迅速下降出现过时效。在时效过程中，从Al-0.04Er-0.50Si合金基体中脱溶出的溶质原子最多，形成更多析出相，提高了合金的硬度，电导率增幅达4.0%IACS。Al-0.04Er-0.50Si合金经过等温时效处理后析出相数密度大大提高，并且析出相结构不再是Al-Er合金中L1_2结构的Al_3Er相而是转变为PuAl_3(HT)型结构的ErAl_(2.8)Si_(0.2)(τ1)相。

关键词(KeyWords)： Al-Er合金;时效;析出相;ErAl_(2.8)Si_(0.2)(τ_1)相

Abstract:

Keywords:

基金项目(Foundation): 国家重点研究计划课题(2021YFB370902,2021YFB3704204,2021YFB3704205);; 国家自然科学基金(51621003)

作者(Author): 计真琦,梁上上,文胜平,熊湘沅,魏午,黄晖

DOI: 10.13289/j.issn.1009-6264.2023-0382

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