采用事温水作为淬火介质进行Jominy末端淬火实验,采集了合金淬火过程试样的温度-时间变化曲线,测定了末端淬火试样距淬火端不同距离合金的淬火态电导率和硬度,结合透射电镜组织观察,研究了冷却速率对合金过饱和固溶体脱溶析出的影响,通过观察淬火析出相非均质形核,考察了7050合金过饱和固溶体淬火脱溶析出相的析出规律.结果表明,淬火冷却速率对7050合金的过饱和固溶体的脱溶析出行为有着显著影响.末端淬火实验过程中,合金过饱和固溶体大角晶界、小角晶界、晶内弥散相周围分别在距淬火端5,10和15 mm出现淬火析出相.随着距淬火端距离的增加,淬火态合金导电率呈上升趋势,合金淬火析出相尺寸变大,体积分数增加.合金淬火平衡η相的非均质形核核心的优先次序为:晶界、亚晶界、A国<,3>Zr等纳米级弥散相粒子.
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