Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97

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 δ' (Al3Li)phase. The results show that the microstructure consists of δ' (Al3Li) phase, T1 (Al2CuLi) phase and θ"/θ'(Al2Cu) phase for 2A97 alloy treated by a triple-aging ora retrogression and re-aging treatment in the following order: (1) at 165 ℃×30 min, (2) at 220 ℃ or 240 ℃×15 min, (3) at 165 ℃×24 h. The plastic deformation, incorporated into the treatment after secondary high temperature aging, promotes the T1 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 ℃ in T6 temper.

作 者： YUAN Zhi-shan LU Zheng XIE You-hua DAI Sheng-long LIU Chang-sheng   作者單位： YUAN Zhi-shan,LIU Chang-sheng(School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China)

LU Zheng,XIE You-hua,DAI Sheng-long(Beijing Institute of Aeronautical Materials, Beijing 100095, China) 

刊 名： 中國(guó)航空學(xué)報(bào)(英文版)  ISTIC 英文刊名： CHINESE JOURNAL OF AERONAUTICS  年，卷(期)： 2007 20(2)  分類(lèi)號(hào)： V2  關(guān)鍵詞： 2A97   Al-Cu-Li-X alloy   RRA treatments   triple aging   microstructure   reversion  

【Effects of RRA Treatments on Microst】相關(guān)文章：

Cause and Effects of Iron Deficiencies05-04

Variations in seed germination of Hippophae salicifolia with different presoaking treatments04-26

Effects of Formaldehyde Inhalation on Lung of Rats04-27

Environmental Effects on Microstructural Stability of SiC/SiC Composites04-26

Evaluation of dust activity and climate effects in North China04-26

Effects of sleep deprivation on gamma oscillation of waking human EEG04-26

EFFECTS OF ENSO ON THE RELATIONSHIP BETWEEN IOD AND SUMMER RAINFALL IN CHINA04-27

Effects of nutrients on Microcystis growth more easily forming bloom04-25

Analysis of sextupole effects on 13 function beating in the SSRF storage ring04-27

Effects of methamidophos and glyphosate on copper sorption-desorption behavior in soils04-25