Si对Al-Er合金时效行为及析出相微观结构的影响
Effect of Si on aging behavior and precipitated phase structure of Al-Er alloy
计真琦 1梁上上 1文胜平 1熊湘沅 1魏午 1黄晖1
作者信息
- 1. 北京工业大学材料与制造学部,北京 100124
- 折叠
摘要
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L12 结构的Al3 Er相而是转变为PuAl3(HT)型结构的ErAl2.8Si0.2(τ1)相.
Abstract
Effect of adding different amounts of Si on aging behavior and precipitated phase structure of the Al-Er alloy at different temperatures was studied by means of microhardness testers,conductivity testers and transmission electron microscopy.The results show that there is no obvious aging strengthening phenomenon during the aging process of the alloy when the Si content is 0.15%and 0.25%.The aging strengthening effect of the alloy is the best when the Si content is 0.50%,the hardness peak(about 40.3 HV0.1)is reached after 72 h of isothermal aging at 275℃and then rapidly decreases,and over aging occurs.During the aging,the desolvated solute atoms are the most from the Al-0.04Er-0.50Si alloy matrix,forming more precipitated phases,improving the hardness of the alloy,and increasing the conductivity by 4.0%IACS.After isothermal aging treatment,the number density of precipitated phases in the Al-0.04Er-0.50Si alloy is greatly increased,and the precipitated phase structure is no longer Al3 Er phase with L12 structure in the Al-Er alloy,but ErAl2.8Si0.2(τ1)phase with PuAl3(HT)type structure.
关键词
Al-Er合金/时效/析出相/ErAl2.8Si0.2(τ1)相Key words
Al-Er alloy/aging/precipitated phase/ErAl2.8Si0.2(τ1)phase引用本文复制引用
基金项目
国家重点研究项目(2021YFB370902)
国家重点研究项目(2021YFB3704204)
国家重点研究项目(2021YFB3704205)
国家自然科学基金(51621003)
出版年
2024
NETL
NSTL
万方数据