石峰,张智超,王旭,吴明

• 1:辽宁石油化工大学机械工程学院
• 2:辽宁石油化工大学石油天然气工程学院

摘要(Abstract)：

研究了铸态Al-4.51Zn-1.77Mg合金在不同均匀化工艺条件下的显微组织的演变规律。结果表明:铸态Al-4.51Zn-1.77Mg合金的DSC曲线在476℃附近出现明显的吸热峰;(460~510℃)×24 h均匀化处理后,476℃附近的吸热峰消失。铸态合金晶粒之间包围着大量的枝晶网络,枝晶臂之间存在着大量的非平衡共晶。随均匀化温度的升高,非平衡共晶逐渐回溶到基体中;高于480℃时,晶粒内部和晶界处开始出现形状不规则的复熔粒子,合金出现过烧。在470℃进行均匀化处理,1 h后大部分第二相已回溶到基体中,随均匀化时间的延长,第二相含量逐渐减少;但24 h后,随时间延长第二相含量无明显变化。根据合金的均匀化动力学方程计算出适合实验合金的均匀化制度为470℃×26 h,与实验结果基本相符。

关键词(KeyWords)： 铝合金;均匀化;显微组织;非平衡共晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51574147);; 辽宁省自然科学基金指导计划(201602474)

作者(Author): 石峰,张智超,王旭,吴明

DOI: 10.13289/j.issn.1009-6264.2017-0181

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