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Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97
Alternative TitleEffects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97
Yuan Zhishan1; Lu Zheng2; Xie Youhua2; Dai Shenglong2; Liu Changsheng1
2007
Source PublicationCHINESE JOURNAL OF AERONAUTICS
ISSN1000-9361
Volume20Issue:2Pages:187-192
AbstractA 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.
Other AbstractA 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.
KeywordFRACTURE-TOUGHNESS RETROGRESSION BEHAVIOR 2A97 Al-Cu-Li-X alloy RRA treatments triple aging microstructure reversion
Indexed ByCSCD
Language英语
CSCD IDCSCD:2911964
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/147167
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Beijing Institute Aeronaut Mat, Beijing 100095, Peoples R China
Recommended Citation
GB/T 7714
Yuan Zhishan,Lu Zheng,Xie Youhua,et al. Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97[J]. CHINESE JOURNAL OF AERONAUTICS,2007,20(2):187-192.
APA Yuan Zhishan,Lu Zheng,Xie Youhua,Dai Shenglong,&Liu Changsheng.(2007).Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97.CHINESE JOURNAL OF AERONAUTICS,20(2),187-192.
MLA Yuan Zhishan,et al."Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97".CHINESE JOURNAL OF AERONAUTICS 20.2(2007):187-192.
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