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

IMR OpenIR

	Effects of RRA treatments on microstructures and properties of a new high-strength aluminum-lithium alloy-2A97
其他题名	Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97
	Yuan Zhishan 1; Lu Zheng 2; Xie Youhua 2; Dai Shenglong 2; Liu Changsheng 1
	2007
发表期刊	CHINESE JOURNAL OF AERONAUTICS
ISSN	1000-9361
卷号	20 期号:2 页码:187-192
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.
其他摘要	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 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.
关键词	FRACTURE-TOUGHNESS RETROGRESSION BEHAVIOR 2A97 Al-Cu-Li-X alloy RRA treatments triple aging microstructure reversion
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:2911964
引用统计	被引频次：3[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/147167
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Beijing Institute Aeronaut Mat, Beijing 100095, Peoples R China
推荐引用方式 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.