Solute clustering in Al-Cu-Mg alloys during the early stages of elevated temperature ageing
Solute clustering in Al-Cu-Mg alloys during the early stages of elevated temperature ageing
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DOI：
10.1016/j.actamat.2010.05.020
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发表时间：
2010-09-01
期刊：
影响因子：
9.4
通讯作者：
Ringer, S. P.
中科院分区：
文献类型：
--
作者：
Marceau, R. K. W.;Sha, G.;Ringer, S. P.
采用原子探针层析成像（APT）、透射电子显微镜（TEM）和正电子湮没谱（PAS）等方法研究了快硬Al-Cu-Mg合金高温时效早期原子级纳米结构的演变。APT分析证实，在150 ℃下老化60 s期间形成了小溶质簇的显著分散体。TEM和APT检测均未观察到带状沉淀结构。这些小团簇被认为是RH效应的原因。仔细的定量APT分析表明，高密度的Cu-Mg团簇与高Mg：Cu比给出了最有效的强化响应。正电子湮没测量也表明，铜镁团簇提供额外的网站空位稳定。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The evolution of atomistic-level nanostructure during the early stages of elevated temperature ageing of rapid hardening (RH) Al-Cu Mg alloys has been characterised by a combination of atom probe tomography (APT), transmission electron microscopy (TEM) and positron annihilation spectroscopy (PAS). APT analysis confirms that significant dispersions of small solute clusters form during ageing for 60 s at 150 degrees C. No zone-like precipitate structures were observed by TEM and APT examinations. These small clusters are believed to be responsible for the RH effect. Careful quantitative APT analysis reveals that a high density of Cu-Mg clusters with high Mg:Cu ratio gives the most potent strengthening response. Positron annihilation measurements also show that Cu Mg clusters provide additional sites for vacancy stabilisation. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.