| 2A14铝合金TTT曲线及其淬火敏感性 |
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| 引用本文： | 董非,易幼平,黄始全,张玉勋.2A14铝合金TTT曲线及其淬火敏感性[J].材料导报,2017,31(10):77-81. |
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| 作者姓名： | 董非 易幼平 黄始全 张玉勋 |
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| 作者单位： | 中南大学高性能复杂制造国家重点实验室,长沙410083;中南大学机电工程学院,长沙410083 |
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| 基金项目： | 江苏省科技计划，重点实验室自由探索课题 |
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| 摘 要： | 采用分级淬火实验方法,绘制了2A14铝合金时间-温度-转换率(TTT)曲线,利用XRD、TEM、EDS等观察分析了合金等温过程中的组织变化,结合Avrami方程研究了等温过程中相变动力学。结果表明合金TTT曲线鼻尖温度为350℃,淬火敏感区间为300~400℃。2A14铝合金过饱和固溶体在350℃等温处理时快速分解,第二相脱溶析出速率达到最高。鼻尖温度较大的过饱和度和较高的扩散速率是第二相快速析出和长大的主要原因。2A14铝合金淬火过程中,建议在淬火敏感区间(300~400℃)提高冷却速率抑制第二相析出,在其他温度区间适当降低冷却速率,以获得较高的综合性能。
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| 关 键 词： | 2A14铝合金 TTT曲线 淬火敏感性 |
TTT Curves and Quench Sensitivity of 2A14 Aluminum Alloy |
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| DONG Fei,YI Youping,HUANG Shiquan and ZHANG Yuxun.TTT Curves and Quench Sensitivity of 2A14 Aluminum Alloy[J].Materials Review,2017,31(10):77-81. |
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| Authors: | DONG Fei YI Youping HUANG Shiquan and ZHANG Yuxun |
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| Affiliation: | State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083;School of Mechanical and Electrical Engineering, Central South University, Changsha 410083,State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083;School of Mechanical and Electrical Engineering, Central South University, Changsha 410083,State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083;School of Mechanical and Electrical Engineering, Central South University, Changsha 410083 and State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083;School of Mechanical and Electrical Engineering, Central South University, Changsha 410083 |
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| Abstract: | Quenching sensitivity of 2A14 aluminum alloy was determined by time-temperature-transformation (TTT) curve,which was carried out by an interrupted quench method.XRD,TEM and EDS were applied to investigate the microstructure of 2A14 aluminum alloy,and the isothermal phase transformation kinetics were studied by Avrami equation.The results showed that the nose temperature of TTT curve was 350 ℃ and the quench sensitive temperature range was 300-400 ℃.In addition,the supersaturated solid solution decomposed and precipitated quickly at 350 ℃,due to higher degree of supersaturation and fast diffusion rate.Furthermore,this work suggests that for 2A14 aluminum alloy,residual stress and mechanical properties can be balanced by increasing cooling rate within quenching sensitivity range (300-400 ℃) and reducing cooling rate in other temperature ranges. |
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| Keywords: | 2A14 aluminum alloy TTT curve quench sensitivity |
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