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金属学报  2010, Vol. 46 Issue (7): 850-856    DOI: 10.3724/SP.J.1037.2010.00036
  论文 本期目录 | 过刊浏览 |
退火过程Al-6Mg-0.7Mn-0.1Zr-0.3Er合金中纳米Al3(ZrxEr1-x)析出相的演化
宫博 文胜平 黄晖 聂祚仁
北京工业大学材料科学与工程学院, 北京 100124
EVOLUTION OF NANOSCALE Al3(ZrxEr1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING
Gong Bo, WEN Shengping, HUANG Hui, NIE Zuoren
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124
引用本文:

宫博 文胜平 黄晖 聂祚仁. 退火过程Al-6Mg-0.7Mn-0.1Zr-0.3Er合金中纳米Al3(ZrxEr1-x)析出相的演化[J]. 金属学报, 2010, 46(7): 850-856.
, , , . EVOLUTION OF NANOSCALE Al3(ZrxEr1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING[J]. Acta Metall Sin, 2010, 46(7): 850-856.

全文: PDF(910 KB)  
摘要: 

利用TEM对Al-6Mg-0.7Mn-0.1Zr-0.3Er合金在退火过程中Al3(ZrxEr1-x)的析出和生
长行为进行了研究. 结果表明: 低温退火(280℃, 470℃)和高温短时间退火(510℃, t≦100 h)
时, Al3(ZrxEr1-x)析出相的粗化符合LSW理论(n=1/3), 高温长时间退火(510℃, 300 h, 500 h)时,
Al3(ZrxEr1-x)析出相没有进一步粗化; Al3(ZrxEr1-x)析出相的粗化主要受Er, Zr等溶质原子在
$\alpha$-Al基体中的扩散影响. 二次析出相Al3(ZrxEr1-x)在较低温度(280和470℃)退火时均匀
分布于α-Al基体中, 较高温度(510℃)退火则呈线状不均匀分布. 在同一退火温度下, 随着
退火过程的进行, Al3(ZrxEr1-x)析出相的形貌逐渐从四方体向规则的球体过渡, 析出相
Al3(ZrxEr1-x)中的x增大.

关键词 退火 Al$_{3}$(Zr$_{x}$Er$_{1-x}$)粗化    
Abstract

Erbium (Er) has attracted considerable attention as a substitute to scandium (Sc) for microalloying. The solid solution of Er and Zr decomposes to form a dispersion of secondary Al3(ZrxEr1-x) during annealing. This secondary Al3(ZrxEr1-x) precipitates improve strength, especially the elevated temperature strength. In the present paper we investigate the evolution of Al3(ZrxEr1-x) precipitate during annealing by transmission electron microscopy (TEM). The Al3(ZrxEr1-x) precipitates nucleate homogeneously at lower temperatures (280℃ and 470 ℃). The transition from homogeneous to heterogeneous nucleation at higher aging temperature (510℃) is a natural consequence of the reduced driving force for nucleus formation as the temperature increases and the Er supersaturation in the α-Al matrix decreases. The change in morphology of the Al3(ZrxEr1-x) precipitates from faceted to approximately spheroidal is associated with a change in the value of interfacial free energies. The diameter and the ratio of Zr/Er increase with increasing aging time at constant temperature. The coarsening of Al3(ZrxEr1-x) is dependent on the diffusivity of Er, Zr in α-Al.

Key wordsannealing    Al3(ZrxEr1-x)    coarsening
收稿日期: 2010-01-19     
基金资助:

国家高技术研究发展计划项目2006AA03A207和2007AA03Z514资助

作者简介: 宫博, 男, 1984年生, 硕士生

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