【作者】 李荣德； 李润霞； 袁晓光； 胡壮麒；

【Author】 Rongde Li, Runxia Li, Xiaoguang Yuan, Zhuangqi Hu

【机构】 沈阳工业大学； 沈阳航空工业学院； 中国科学院沈阳金属研究所；

【摘要】 本文通过对固溶处理过程中铸造Al-Si-Cu-Mg合金析出相溶解过程的观察,发现在固溶处理初期,组织中θ相的数量逐渐减少,但在(FeMn)3SiAl12相中还有一定的Cu含量;而固溶后期,富铁相中的Cu含量也明显降低,且难溶的Al3Ti针状相也发生了钝化,但部分Q相尚存在。随着固溶时间的延长,合金基体中Cu和Mg的含量逐渐增多,且富Mn和富Ti相也在合金基体中略有溶解。由于固溶处理后合金基体中Mg和Mn原子数量较少,且Si原子的固溶强化作用基本忽略,合金的固溶强化作用主要来源于富Cu相的溶解。在Al-Si-Cu-Mg固溶处理过程中,合金力学性能的提高主要来源于共晶硅相形貌的球化、析出相的溶解引起的的固溶强化及组织的均匀化。更多还原

【Abstract】 This paper has studied the dissolution of the intermetallic phases and analysed the function of solution strengthening in Al - Si - Cu - Mg casting alloys during solution heat treatment. It is found that theθ#-phases (Al2Cu) dissolve gradually in initial stage of solution, but still exist around (FeMn) 3SiAl12 particles until holding long time. In final stage of solution the needle - like Al3Ti phases blunt but Q phases (Cu2Mg3Si5Al4) still exist. With the solution treated, the amount of Cu and Mg atoms in matrix increase, and Mn and Ti intermetallics dissolved partly. However, because of small amount of Mg and Mn atoms and precipitation of excessive Si atoms, the function of solution strengthening is mainly come from Cu atoms. The increase of mechanical properties of alloy during solution heat treatment are due to combined effect of the dissolution of the intennetallic phases, uniformity of structure and spheroidization of silicon particles.更多还原