Precipitation behavior of AA2618

被引:15
作者
Lu, H.
Kadolkar, P.
Nakazawa, K.
Ando, T.
Blue, C. A.
机构
[1] Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02210 USA
[2] Contech Metal Forge, Oak Ridge Natl Lab, Mat Sci & Technol Div, Clarksville, TN 37040 USA
[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2007年 / 38A卷 / 10期
基金
美国能源部;
关键词
D O I
10.1007/s11661-007-9295-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The precipitation behavior of AA2618 was studied by a multitude of characterization techniques: microhardness testing, lattice parameter measurement through X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and atom probe field ion microscopy (APFIM). The matrix lattice parameter increased during the first 20 hours of natural aging, due to the formation of Cu clusters and decreased over the next 24 hours, due to the formation of Mg-rich clusters. Prior natural aging weakened subsequent artificial aging hardening at 180 degrees C, 200 degrees C, and 230 degrees C, due to the cluster reversion that delayed the precipitation of strengthening phases. The matrix lattice parameter exhibited erratic changes during artificial aging that corresponded to the formation and partial dissolution of Guinier-Preston-Bagaryatsky (GPB) zones, the transformation of GPB zones to GPB2 zones, and the precipitation of S'. The structural changes during the artificial aging of AA2618 occur in this sequence: supersaturated solid solution -> clusters + GPB -> GPB + GPB2 -> GPB2 + S' -> S'+ S -> S.
引用
收藏
页码:2379 / 2388
页数:10
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