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《材料导报》期刊社  2017, Vol. 31 Issue (12): 140-144    https://doi.org/10.11896/j.issn.1005-023X.2017.012.029
  计算模拟 |
LD7铝合金淬火敏感性及相变动力学规律*
江道1,2, 易幼平1,2, 黄始全1
1 中南大学高性能复杂制造国家重点实验室, 长沙 410083;
2 中南大学轻合金研究院, 长沙 410083
Quench Sensitivity and Phase Transformation Kinetics of LD7 Aluminum Alloy
JIANG Dao1,2, YI Youping1,2, HUANG Shiquan1
1 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083;
2 Light Alloy Research Institute, Central South University, Changsha 410083
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摘要 通过分级淬火的方法,结合所测LD7铝合金淬火态电导率和时效态硬度拟合出合金的时间-温度-转化率(TTT)曲线和时间-温度-性能(TTP)曲线。利用透射电镜(TEM)和Johnson-Mehl-Avrami(JMA)方程研究了铝合金等温淬火过程中的组织变化和相变动力学规律。结果表明:LD7铝合金TTT和TTP曲线的鼻尖温度均为350 ℃,孕育期约为2 s,淬火敏感区间为290~410 ℃;等温保温过程中过饱和固溶体析出第二相粒子,鼻尖温度附近析出速率最快;随保温时间的延长,第二相富集长大且粗化,无沉淀析出区域变宽,晶界第二相连续化,导致合金强化效果下降;根据相变动力学方程拟合出的 S曲线,解释了合金在350 ℃附近淬火敏感性最大以及淬火敏感区间合金第二相主要以针状形态析出的规律。
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江道
易幼平
黄始全
关键词:  LD7铝合金  时间-温度-转化率(TTT)曲线  时间-温度-性能(TTP)曲线  淬火敏感性  相变动力学    
Abstract: The quench sensitivity of LD7 aluminum alloy was determined by the time-temperature-transformation (TTT) curves and time-temperature-property (TTP) curves by an interrupted quench technique with measurement of as-quenched electro-conductivity and as-aged hardness.The microstructure evolution and phase transformation kinetics during isothermal quenching treatment were studied by the transmission electron microscopy (TEM) and Johnson-Mehl-Avrami (JMA) equation. The results showed that the nose temperature of TTT curves and TTP curves were both about 350 ℃, and the incubation period was about 2 s, with the quench sensitivity range of 290-410 ℃. The supersaturated solid solution decomposed and particles precipitate during quench process; the precipitation rate was the highest at the nose temperature. Prolonging holding time leads to bigger and coarser second phase particles and widened precipitation free zone in the matrix, more spaced second phase particles precipitated at the grain boundary, which resulted in the loss of solutes and decrease of subsequent aging hardening effect. The fitted S-curve according to the phase transformation kinetics equation explained that the precipitation rate was the highest at about 350 ℃ and the mechanism of solid solution mainly precipitates as needle-like phases during quench sensitive range.
Key words:  LD7 aluminum alloy    time-temperature-transformation (TTT) curves    time-temperature-property (TTP) curves    quench sensitivity    phase transformation kinetics
               出版日期:  2017-06-25      发布日期:  2018-05-08
ZTFLH:  TG146.21  
基金资助: *国家重点实验室自由探索课题(zzyjkt2014-02);江苏省科技计划(BA2015075)
通讯作者:  易幼平:通讯作者,男,1966年生,教授,主要从事航空锻件制造工艺与组织性能控制技术研究 E-mail:yyp@csu.edu.cn   
作者简介:  江道:男,1991年生,硕士研究生,主要从事环形件冷变形强化和残余应力消减研究 E-mail:jiangd@csu.edu.cn
引用本文:    
江道, 易幼平, 黄始全. LD7铝合金淬火敏感性及相变动力学规律*[J]. 《材料导报》期刊社, 2017, 31(12): 140-144.
JIANG Dao, YI Youping, HUANG Shiquan. Quench Sensitivity and Phase Transformation Kinetics of LD7 Aluminum Alloy. Materials Reports, 2017, 31(12): 140-144.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.012.029  或          http://www.mater-rep.com/CN/Y2017/V31/I12/140
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