马飞跃,刘志义,邓才智,柏松,罗虎,李尧

• 1:中南大学有色金属材料科学与工程教育部重点实验室
• 2:中南大学材料科学与工程学院

摘要(Abstract)：

采用扫描示差量热法(DSC)、扫描电镜(SEM)、光学显微镜(OM)和能谱分析(EDS)等手段研究了含微量Zr的Al-Cu-Mg-Ag合金铸态与不同均匀化热处理态的显微组织演化和成分分布,测定了该合金铸态组织中的低熔点共晶相的成分和熔化温度,确定了该合金的均匀化处理制度和过烧温度。结果表明:Al-Cu-Mg-Ag-Zr合金铸态组织晶界上主要的非平衡相为Al2Cu,其熔点为523.52℃。合金经420℃×6h一级均匀化处理后,Al3Zr粒子在基体内二次析出且弥散分布。经515℃×24h二级均匀化处理后,晶界上的非平衡相大部分溶入基体,枝晶偏析基本消除,晶内各元素分布均匀。该合金的最佳均匀化制度为420℃×6h+515℃×24h,均匀化过烧温度为520℃。

关键词(KeyWords)： Al-Cu-Mg-Ag合金;多级均匀化处理;组织

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划资助项目(2005CB623705-04)

作者(Author): 马飞跃,刘志义,邓才智,柏松,罗虎,李尧

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