Natural-ageing-enhanced precipitation near grain boundaries in high-strength aluminum alloy

Natural-ageing-enhanced precipitation near grain boundaries in high-strength aluminum alloy
复制标题

高强度铝合金晶界附近自然时效强化析出

DOI:
10.1016/j.jmst.2019.11.035
复制
发表时间:
2020-06
影响因子:
10.9
通讯作者:
Jianjun Li
Jianjun Li
中科院分区:
材料科学1区
文献类型:
--
作者:
Peipei Ma;Chunhui Liu;Qiuyu Chen;Qing Wang;Lihua Zhan;Jianjun Li

文献摘要

参考文献

被引文献

相似文献

在Al-Zn-Mg-Cu合金中,淬火后直接在16 5 °C以上进行人工时效,可形成∼5 0 nm宽无沉淀区和∼10 0 nm宽沉淀稀疏区,其中粗大析出物的尺寸和密度呈梯度分布。随着颗粒尺寸的减小,PFZ和PSZ在颗粒中的比例变大,甚至可以占据整个颗粒的体积。自然预时效大大减轻了晶界附近的这种不良组织,导致了高温下时效硬化潜力的异常增强。自然时效可以从根本上改变晶界附近的析出物,是优化异常细晶高强铝合金析出硬化的有效方法。
Artificial ageing above 165 °C directly after quenching induces the formation of ∼50 nm wide precipitate-free zone (PFZ) and ∼100 nm wide precipitate-sparse zone (PSZ) consisting of coarse precipitates with a gradient in size and density toward the grain center in a commercial Al-Zn-Mg-Cu alloy. With the grain size decreasing, the fraction of PFZ and PSZ in a grain becomes larger and could even occupy the entire volume of the grain. This undesirable microstructure near the grain boundary is mitigated substantially by natural pre-ageing, leading to an exceptional enhancement of the age hardening potential at elevated temperatures. Natural ageing could fundamentally alter the precipitation near grain boundary, and is a promising method to optimize the precipitation hardening in high strength aluminum alloys with unconventionally small grains.
DOI: 10.1007/s11661-018-4601-8
发表时间: 2018-04
期刊: Metallurgical and Materials Transactions A
影响因子: --
作者:
M. Ajay Krishnan;V. S. Raja;Shweta Shukla;S. M. Vaidya
通讯作者: M. Ajay Krishnan;V. S. Raja;Shweta Shukla;S. M. Vaidya
DOI: 10.1016/j.jallcom.2018.01.003
发表时间: 2018-04
影响因子: 6.2
作者:
J. Österreicher;G. Kirov;S. Gerstl;Ermal Mukeli;F. Grabner;Manoj Kumar
通讯作者: J. Österreicher;G. Kirov;S. Gerstl;Ermal Mukeli;F. Grabner;Manoj Kumar
DOI: 10.1016/j.corsci.2011.05.057
发表时间: 2011-10-01
期刊: CORROSION SCIENCE
影响因子: 8.3
作者:
Marlaud, T.;Malki, B.;Baroux, B.
通讯作者: Baroux, B.
DOI: 10.1016/j.msea.2007.01.001
发表时间: 2007-07-15
影响因子: 6.4
作者:
Gubicza, J.;Schiller, I.;Langdon, T. G.
通讯作者: Langdon, T. G.
DOI: 10.1016/j.actamat.2006.10.015
发表时间: 2007-03
期刊: Acta Materialia
影响因子: 9.4
作者:
B. Cai;B. Adams;T. Nelson
通讯作者: B. Cai;B. Adams;T. Nelson