(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 通过Jominy末端淬火实验研究2124铝合金的淬透性。利用温度数据采集、布氏硬度检测、差示量热法（DSC）和透射电子显微镜（TEM）等手段分析淬火冷却速率对时效后第二相析出行为的影响。结果表明：Jominy末端淬火2124铝合金室温水淬硬度下降小于10%的淬透深度大约为50 mm，该位置处合金在222.7~350.0 ℃温度区间的平均淬火冷却速率大于2.0 ℃/s；较低的淬火冷却速率致使过饱和的溶质原子和空位损失，导致时效析出相变驱动力不足，显著削弱了时效强化效果。
关键字: 2124铝合金；末端淬火；淬透性；脱溶析出
Jominy end quench test
（State Key Laboratory of Nonferrous Metals and Processes,
General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:The hardenability of 2124 aluminum alloy was investigated by means of Jominy end quench test. The effects of cooling rate on ageing precipitation and strengthening behavior were analyzed by temperature data acquisition, Brinell hardness measurement, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) observation. The results show that the hardening depth with hardness loss below 10% of 2124 alloy Jominy specimen quenched by room temperature water is approximately 50mm where the average cooling rate through the temperature range from 222.7 ℃ to 350.0 ℃ is above 2.0 ℃/s. The age hardening response of 2124 alloy is obviously weakened at slower quenching rate, which is caused by the loss of vacancies and solutes.
Key words: 2124 aluminum alloy; end quenching; hardenability; precipitation
