(北京工业大学材料与制造学部，北京 100124)
摘 要: 本文采用传统铸锭冶金的方法制备不同Si和Er含量的Al-Zr合金，研究Si和Er对Al-Zr合金时效析出行为的影响。结果表明：Si的添加促进了Al-Zr合金的时效硬化响应，Si大大降低第二相Al3Zr的析出温度。Al-0.25Zr-0.30Si合金在325 ℃等温时效时获得最佳时效强化增量，最高硬度值达到57.1HV，较其固溶态合金增加25.8 HV。Al-Zr合金获得最佳时效硬化增量的Si含量为0.30%(质量分数)。Er的添加进一步促进Al-Zr合金的时效响应，拓宽了Al-Zr合金时效析出温度范围(325~375 ℃)，析出相变得更加细密。Al-0.25Zr-0.30Si-0.25Er合金在350 ℃等温时效时获得最大时效强化增量，最高硬度值达到60.5 HV，这主要是由于Si、Er复合微合金化比单独添加Si更能提高Al-Zr合金沉淀相的数量密度并细化其尺寸。
关键字: Al-Zr合金；析出相；时效强化；微合金化
（Faculty of Materials and Manufacturing, Beijing University of
Technology, Beijing 100124, China）
Abstract:The effect of Si and Er on the aging behavior of Al-Zr alloy was studied. The results show that the Si-addition promotes the aging strengthening effect of Al-Zr alloy, and greatly reduces the precipitation temperature of Al3Zr precipitates. The Al-0.25Zr-0.30Si alloy obtains the maximum increment of strengthening when isothermal aging at 325 ℃. The highest hardness is 57.1 HV, which is greater by 25.8 HV than that in the solid solution state. Content of 0.30% Si is optimal to obtain the maximum hardening increment for Al-0.25Zr alloy. The addition of Er further promotes the aging response of Al-Zr alloy, which widens the aging precipitation temperature range (325-375 ℃) of Al-Zr alloy and the precipitates become finer and denser. Al-0.25Zr-0.30Si-0.25Er alloy has the maximum hardening increment as isothermal aging at 350 ℃ and the peak hardness is 60.5 HV. Because co-microalloying with Er and Si can increase the number density and refine the size of precipitates in Al-0.25Zr alloy compared with adding Si alone.
Key words: Al-Zr alloys; precipitates; aging strengthening; microalloying
