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首页> 外文期刊>Chinese journal of aeronautics >Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97
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Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97

机译：RRA处理对新型高强度铝锂合金2A97的组织和性能的影响

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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′ (Al_3Li) phase. The results show that the microstructure consists of δ′ (Al_3Li) phase, T_1 (Al_2CuLi) phase and θ″/ θ′(Al_2Cu) phase for 2A97 alloy treated by a triple-aging of a retrogression and re-aging treatment in the following order: (1) at 165℃ x 30 min, (2) at 220℃ or 240℃ x 15 min, (3) at 165℃ 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℃ in T6 temper.
机译：对一种新的高强度2A97 Al-Cu-Li-X合金进行了三步时效后退和再时效处理（RRA）。透射电子显微镜（TEM），差示扫描量热法（DSC）和拉伸试验用于研究RRA处理对显微组织和性能的影响。 DSC测试揭示了强化δ'（Al_3Li）相的回复温度范围。结果表明，经3次时效回火和再时效处理后的2A97合金，组织由δ'（Al_3Li）相，T_1（Al_2CuLi）相和θ''/θ'（Al_2Cu）相组成。顺序：（1）在165℃x 30分钟，（2）在220℃或240℃x 15分钟，（3）在165℃x 24 h。二次高温老化后，结合到处理中的塑性变形会促进T_1在最终的再老化过程中沉淀。经过回归和再时效处理的合金的拉伸性能达到了T6回火在165℃时单时效的峰值水平。

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