7XXX系(Al-Zn-Mg-Cu)铝合金淬火特性的研究进展

对7XXX系(Al-Zn-Mg-Cu)铝合金的淬火特性和淬透性进行了回顾，铝合金淬透性是淬火冷却速率与淬火后性能相关的特性，探讨了铝合金淬透性的机理，总结了淬透性的评价方法，从铝合金的化学成分，制备工艺和微观组织分析了影响淬透性的因素，提高其淬透性是获得高性能7XXX系(Al-Zn-Mg-Cu)铝合金的关键因素，并且分类介绍了铝合金的淬透性研究方法，其中包括测定铝合金淬透层深度的端淬-硬度试验法、测定铝合金TTT曲线的等温时效-电导率法、测定TTP曲线运用等温时效-力学性能测试法、连续冷却和相变试验法测定铝合金CCT曲线.为了提高铝合金的淬透性，需要拓宽思路，进一步完善铝合金淬透性试验方法. 

Research progress of the quenching characteristic of 7XXX (Al-Zn-Mg-Cu) aluminum alloy

The quenching characteristics and hardenability of 7XXX series (Al-Zn-Mg-Cu) aluminum alloys are reviewed. The hardenability of aluminum alloy is the property related to the quenching rate and the performance after quenching. By summarizing the mechanism of hardenability of aluminum alloys and the evaluation method of hardenability, we analyzed the factors affecting hardenability from the chemical composition, preparation process and microstructure of aluminum alloys. The results show that enhancing the hardenability is the key factor to obtain high-performance 7XXX series (Al-Zn-Mg-Cu) aluminum alloys. This paper introduces the research methods of hardenability of aluminum alloys, including the quenching-hardness testing method for determining the depth of aluminum alloy hardened layers, the isothermal aging-conducting method for determining the TTT curve of aluminum alloys, and the isothermal aging-mechanics for measuring TTP curves, performance test method, continuous cooling and phase change test method, to determine the curves of aluminum alloy CCT. In order to improve the hardenability of aluminum alloys, it is necessary to improve the aluminum alloy hardenability test methods.