熔体混合细化变质处理对A356铝合金组织的影响

发布时间：2018-05-25 05:25

本文选题：熔体混合细化变质处理 + 化学势　；参考：《稀有金属材料与工程》2017年01期

【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的浓度,使第二相粒子平衡分配系数K_0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]:In order to improve the refining effect and reduce the cost of A356 aluminum alloy, the melts are mixed and refined, and compared with the conventional refined metamorphism. The results show that the melt blending refinement modification has better refining effect, the exchange of particles and energy can be carried out in the melt intermixing process and the second phase particle is spontaneous. From the chemical potential high phase into the chemical potential low phase, reducing the total free energy of the system, the system tends to reach the balance. Because of the change of the concentration of the second phase particles in the liquid phase, the equilibrium distribution coefficient K_0 of the second phase particles is changed, the crystallization precipitation behavior changes, the enrichment segregation of the second phase particles is reduced, and the refining effect is obviously improved.
【作者单位】：江苏大学;
【基金】：江苏省教育厅自然科学基金(12KJD430002) 2014年度江苏大学研究生科研创新计划(KYXX_0001)
【分类号】：TG146.21;TG292

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