Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97

被引：19
作者：
Yuan Zhi-shan [1 ]
Lu Zheng [2 ]
Xie You-hua [2 ]
Dai Sheng-long [2 ]
Liu Chang-sheng [1 ]
机构：
[1] Northeastern Univ, Sch Met & Mat, Shenyang 110004, Peoples R China
[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
来源：
CHINESE JOURNAL OF AERONAUTICS | 2007年 / 20卷 / 02期
关键词：
2A97; Al-Cu-Li-X alloy; RRA treatments; triple aging; microstructure; reversion;
D O I：
10.1016/S1000-9361(07)60031-4
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
A new high strength 2A97 Al-Cu-Li-X alloy was subjected to triple-aging of retrogression and re-aging treatments (RRA). Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and tensile tests were used to investigate the effects of RRA treatment on the microstructures and properties. DSC test reveals the reversion temperature range of the strengthening delta' (Al3Li) phase. The results show that the microstructure consists of delta' (Al3Li) phase, T-1 (Al2CuLi) phase and theta ''/theta' (Al2Cu) phase for 2A97 alloy treated by a triple-aging of a retrogression and re-aging treatment in the following order: (1) at 165 degrees C x 30 min, (2) at 220 degrees C or 240 degrees C x 15 min, (3) at 165 degrees C x 24 h. The plastic deformation, incorporated into the treatment after secondary high temperature aging, promotes the T-1 precipitation during final re-aging. The tensile properties of the alloy treated by the retrogression and re-aging treatment reach the peak level of alloy single-aged at 165 degrees C in T6 temper.
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页码：187 / 192
页数：6
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