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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Evolution and Mechanical Properties of 2219 Al Alloy During Aging Treatment
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Microstructure Evolution and Mechanical Properties of 2219 Al Alloy During Aging Treatment

机译：2219 Al合金在老化处理中的微观结构演化与力学性能

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摘要

Hardness and tensile properties of 2219 Al alloys were tested at various temperature (150, 165, 175 A degrees C) and subjected to T6 temper heat treatment to identify the peak aging time at various temperature. Microstructure evolution and precipitate behavior were analyzed with transmission electron microscope (TEM), differential scanning calorimetry (DSC) and x-ray diffraction (XRD). It is found that the peak aging time is 24 h at 150 A degrees C and does not vary down to 165 A degrees C. When the aging temperature rise to 175 A degrees C, the peak aging time down to 12 h. Considering the strength and elongation, the optimum aging treatment is at 165 A degrees C for 24 h after the solution treatment at 535 A degrees C for 1.5 h. Compared with that of only water-quenched sample, after aged at 165 A degrees C for 24 h, the tensile strength of the 2219 Al alloy increases from 324.5 to 411.8 MPa, yield strength from 168 to 310.8 MPa, respectively. The improvement in the mechanical performance is mainly attributed to the precipitation strengthening of the GP zones, theta aEuro(3) and theta' phases.
机译：在各种温度（150,165,175℃）上测试2219 Al合金的硬度和拉伸性能，并进行T6脾热处理，以在各种温度下鉴定峰值老化时间。用透射电子显微镜（TEM），差示扫描量热法（DSC）和X射线衍射（XRD）分析微观结构演化和沉淀行为。发现峰值老化时间在150℃下为24小时，并且当老化温度升至175℃时，峰值老化时间下降至12小时时，峰值老化时间也不会变化至165℃。考虑到强度和伸长率，在535℃下溶液处理后，最佳老化处理在165℃下在535℃下进行1.5小时。与仅在165℃下老化后的仅水淬料样品相比，2219Al合金的拉伸强度从324.5升至411.8MPa，分别从168-310.8MPa屈服。机械性能的改善主要归因于GP区，Theta Aeuro（3）和θ阶段的沉淀强化。

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