Influence of electric field on the quenched-in vacancy and solute clustering during early stage ageing of Al-Cu alloy
Influence of electric field on the quenched-in vacancy and solute clustering during early stage ageing of Al-Cu alloy
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电场对Al-Cu合金早期时效淬入空位和溶质团簇的影响
DOI：
10.1016/j.jmst.2017.07.020
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发表时间：
2017-08
影响因子：
10.9
通讯作者：
N. Qi
中科院分区：
文献类型：
--
作者：
S. Fu;Ying Zhang;Huiqun Liu;Danqing Yi;Bin Wang;Yong Jiang;Z. Q. Chen;N. Qi
利用正电子湮灭寿命谱、高角度环形暗场扫描透射电镜、透射电镜、硬度测量和四探针电阻率测量等手段，研究了电场对Al-4wt%Cu合金中过量淬火空位演化和溶质团聚以及纯铝空位迁移和生成热的影响。结果表明，电场明显改善了Al-4wt%Cu合金时效早期的时效硬化响应，并将过量空位的衰减推迟了30 min。施加电场老化 1 分钟后，观察到大量密集分布的 2-4 nm GP 区。从1分钟到120分钟的老化过程中，电场辅助时效样品的GP区粗化率较低，约为无电场时效样品的五分之三。与没有电场的纯Al的空位迁移焓（0.611±0.023eV）相比，电场使纯Al的空位迁移焓（0.663±0.021eV）增加了8%。电场引起的空位迁移焓的增加是造成Al-4wt%Cu合金早期时效过程中淬灭空位演化、快速溶质团聚和时效硬化改善差异的原因。
The effects of electric field on the evolution of excess quenched-in vacancy as well as solute clustering in Al-4wt%Cu alloy, and on the vacancy migration and formation enthalpy of pure aluminum were investigated, using positron annihilation lifetime spectroscopy, high-angle annular dark-field scanning transmission electron microscopy, transmission electron microscopy, hardness measurement and four-probe electrical resistivity measurement. The results showed that the electric field improved age hardening response obviously and postponed the decay of excess vacancies for 30 min during the early stage ageing of Al-4wt%Cu alloy. A large number of 2–4 nm GP zones with dense distribution were observed after 1 min ageing with an electric field applied. The electric field-assisted-aged sample owned a lower coarsening rate of GP zone, which was about three fifths of that in the aged sample without an electric field, from 1 min to 120 min ageing. The electric field contributed 8% increase of the vacancy migration enthalpy (0.663 ± 0.021 eV) of pure Al, comparing with that (0.611 ± 0.023 eV) of pure Al without an electric field. The increase of vacancy migration enthalpy, induced by the electric field, was responsible for the difference on evolution of quenched-in vacancy, rapid solute clustering and age hardening improvement during the early stage ageing of Al-4wt%Cu alloy.
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影响因子：
4.5
作者：
H. Conrad;S. Ramachandran;K. Jung;J. Narayan
通讯作者：
H. Conrad;S. Ramachandran;K. Jung;J. Narayan
影响因子：
9.4
作者：
Marceau, R. K. W.;Sha, G.;Ringer, S. P.
通讯作者：
Ringer, S. P.
DOI：
10.1016/0001-6160(89)90305-2
发表时间：
1989-10
期刊：
Acta Metallurgica
影响因子：
--
作者：
K. E. Rajab;R. Doherty
通讯作者：
K. E. Rajab;R. Doherty
影响因子：
10.9
作者：
Z. Xiu;Wenshu Yang;Ronghua Dong;M. Hussain;Longtao Jiang;Yongxing Liu;Gaohui Wu
通讯作者：
Z. Xiu;Wenshu Yang;Ronghua Dong;M. Hussain;Longtao Jiang;Yongxing Liu;Gaohui Wu
DOI：
10.1016/0001-6160(79)90030-0
发表时间：
1979-03
期刊：
Acta Metallurgica
影响因子：
--
作者：
G. Shiflet;H. Aaronson;T. Courtney
通讯作者：
G. Shiflet;H. Aaronson;T. Courtney