TY - JOUR
T1 - Electron microscopy studies of the age-hardening behaviors in 6005A alloy and microstructural characterizations of precipitates
AU - Yang, Wenchao
AU - Huang, Lanping
AU - Zhang, Ruirong
AU - Wang, Mingpu
AU - Li, Zhou
AU - Jia, Yanlin
AU - Lei, Ruoshan
AU - Sheng, Xiaofei
PY - 2012/2/15
Y1 - 2012/2/15
N2 - High-resolution electron microscopy was used to research the age-hardening behaviors in 6005A alloy and the microstructural characterizations of precipitates. It was found that β″, β′ and Q′ precipitates had 12 orientation variants, respectively, the smaller size and a high-density β′′ precipitates existed in alloy for a long time, which played a very important role in controlling an anti-overaged softening behavior in 6005A alloy. Further, by the crystallographic interface and morphology analysis, a main reason was that a 2-dimensions coherency strain-field not only had the high-density β′′ precipitates become the biggest obstacle of dislocations movement, but also made them transform into β′ and Q′ precipitates with more difficulty. Moreover, it was also found that β′ and Q′ precipitates had weaker relatively strain-fields, the larger size and a lower density, which were largely associated with the reduction in hardness that occurred upon overaging. Further, the strengthening of precipitates on alloys could be summarized as: β″ > Q′ > β′. Based on the structural information, the quantitative Moiré fringes analytical technique was also used to verify the lattice parameters and orientation of precipitates.
AB - High-resolution electron microscopy was used to research the age-hardening behaviors in 6005A alloy and the microstructural characterizations of precipitates. It was found that β″, β′ and Q′ precipitates had 12 orientation variants, respectively, the smaller size and a high-density β′′ precipitates existed in alloy for a long time, which played a very important role in controlling an anti-overaged softening behavior in 6005A alloy. Further, by the crystallographic interface and morphology analysis, a main reason was that a 2-dimensions coherency strain-field not only had the high-density β′′ precipitates become the biggest obstacle of dislocations movement, but also made them transform into β′ and Q′ precipitates with more difficulty. Moreover, it was also found that β′ and Q′ precipitates had weaker relatively strain-fields, the larger size and a lower density, which were largely associated with the reduction in hardness that occurred upon overaging. Further, the strengthening of precipitates on alloys could be summarized as: β″ > Q′ > β′. Based on the structural information, the quantitative Moiré fringes analytical technique was also used to verify the lattice parameters and orientation of precipitates.
KW - Aluminum alloys
KW - High-resolution electron microscopy (HREM)
KW - Microstructure
KW - Moiré fringes
KW - Precipitate
KW - Strengthening
UR - http://www.scopus.com/inward/record.url?scp=84455205480&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2011.11.074
DO - 10.1016/j.jallcom.2011.11.074
M3 - 文章
AN - SCOPUS:84455205480
SN - 0925-8388
VL - 514
SP - 220
EP - 233
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -