Influence of Cu and minor elements on solution treatment of Al–Si–Cu–Mg cast alloys
- 作者：Wang ; Guiqing ; Bian ; Xiufang ; Wang ; Weimin ; Zhang ; Junyan
- 关键词：Aluminum alloy ; Casting ; Solution treatment ; Incipient melting ; Polynary eutectic phase
- 刊名：Materials Letters
- 出版年：2003
- 期刊代码：59_0167577x
- 类别：ms
- 出版时间：August, 2003
- 卷：57
- 期：24-25
- 页码：4083-4087
- 文件大小：222 K
摘要
This paper has studied the influence of Cu content and microelements on solution treatment of Al–Si–Cu–Mg cast alloys by a series of differential scanning calorimetry (DSC) analyses. With the increase of Cu content, the melting point of α (Al)+Si decreases and polynary eutectic phases with melting point of 507 °C form. Sodium modification has little influence on the melting point of polynary eutectic phases, but it is increased by about 5 °C in Sr modified or Be-containing alloys. Incipient melting and the determination of two-step solution treatment (conventional solution treatment followed by a high-temperature solution treatment) parameters have been analyzed in unmodified and Sr modified Al11Si4Cu0.3Mg alloy. Factors influencing segregation should be considered in determining solution treatment parameters and this has been discussed.