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本文系统研究了热处理制度(包括单级时效、不同温度和时间组合的双级时效、分级淬火)对含Zr的Al—Zn—Mg—Cu系合金显微组织和力学性能的影响。结果表明,预时效+150℃/24h终时效的双级时效工艺具有比传统的峰值时效工艺T6和其它双级时效工艺更高的强度和塑性。通过对透射电镜薄膜样品的组织观察,分析了分级淬火及时效过程中合金的沉淀析出行为及ZrAl_3相对沉淀过程的影响。
In this paper, the effects of heat treatment system (including single-stage aging, two-stage aging with different temperature and time, classification and quenching) on the microstructure and mechanical properties of Zr-containing Al-Zn- The results show that the pre-aging + 150 ℃ / 24h final aging two-stage aging process has higher strength and plasticity than the traditional peak aging process T6 and other two-stage aging process. Through the microstructure observation of transmission electron microscopy, the precipitation behavior and the relative precipitation of ZrAl_3 during the process of graded quenching and aging were analyzed.