摘要
基于元胞自动机-有限元(CAFE)法,建立了7085铝合金形核和晶粒生长的数学模型,运用扩展的KGT模型计算得到了7085铝合金的生长动力学参数。模拟和试验结果表明,熔体经超声处理,晶粒组织明显细化,晶粒平均尺寸由未施加超声时的535μm减小为241μm(170W)和197μm(240W),组织形貌由枝状晶变为细小等轴晶。在超声作用下,形核率增加是晶粒细化的主要原因,晶核生长速度变化属于次级效应,对最终晶粒尺寸影响较小。
Based on the process of coupling cellular automaton with finite element, the mathematical mod- el of nucleation and grain growth of 7085 aluminum alloy was established. Growth kinetics parameters of 7085 aluminum alloy were given by using extended KGT model calculation. The simulated and experi- mental results show that the grain size is obviously refined and the morphology of grain is changed into equiaxed grain from dendrite. Meanwhile, the average grain size is decreased from 535 μm without ultra- sonic to 241μm（170W）and 19μm（240W）. The increase of nucleation rate plays a main role in grain re- finement, and the contribution of grain nucleation growth is the minor effect.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第10期969-973,共5页
Special Casting & Nonferrous Alloys
基金
国家重点基础研究发展计划(973计划)资助项目(2010CB731706
2012CB619504)
