熔体混合细化变质处理对A356铝合金组织的影响

Refining and Modification by Controlled Diffusion Solidification on the Structure of A356 Aluminum Alloy

摘要:

摘 要：为提高A356铝合金细化变质效果、降低成本，对其进行熔体混合细化变质处理，并与常规细化变质处理进行对比，结果表明，熔体混合细化变质处理具有更佳的细化变质效果，熔体互混过程中能充分地进行粒子和能量交换，第二相粒子自发地从化学势高的相进入化学势低的相，降低系统总的自由能，使系统趋于达到平衡，由于改变第二相粒子在液相中浓度，使第二相粒子平衡分配系数K0改变，结晶析出行为改变，降低了第二相粒子的富集偏析，明显改善细化变质效果。

Abstract:

Abstract: In order to improve the refining and modification effect of A356 aluminum alloy, reduce the cost, carry melt mixing refining and modification on A356 aluminum alloy, and compared with traditional technique. The experimental results showed that the melt mixing refining and modification treatment has a better effect. In the process of the mutually melt mixing can fully for particles and energy exchange, the second phase particles spontaneously from higher chemical potential phase into the lower chemical potential phase，reduce the total free energy of system, make the system to achieve balance. Due to the change of the solute in the liquid phase concentration, change the equilibrium of the solute distribution coefficient K0, change its crystallization precipitation, reduce the enrichment of segregation of second phase particles, and significantly improve the refining and modification effect.