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采用室温水作为淬火介质进行Jom iny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 l3Zr等纳米级弥散相粒子。
The Jom iny end quenching experiment was carried out using room temperature water as the quenching medium. The temperature-time curves of the samples during quenching process were collected. The quenched conductivity and hardness of the quenched samples at different distances from the quenched end were measured. Combined with transmission electron microscopy The effects of cooling rate on the desolventizing of supersaturated solid solution were investigated. The heterogeneous nucleation of precipitated phase was observed. The precipitation regularity of the quenched and precipitated phase of 7050 superacid solid solution was investigated. The results show that quenching cooling rate has a significant effect on the dissolution and precipitation behavior of supersaturated solid solution of 7050 alloy. In the process of quench test, the quenched precipitates appear in the high-angle grain boundary, the small-angle grain boundary and the intragranular dispersoid in the supersaturated solid solution at 5, 10 and 15 mm away from the quenched end. With the increase of the distance from the quenching end, the conductivity of quenched alloy is on the rise. The size of quenched precipitates becomes larger and the volume fraction increases. Alloy quenching equilibrium η phase heterogeneous nucleation of the core priorities: grain boundaries, subgrain boundaries, A l3Zr nanoscale dispersion phase particles.