摘要
为了研究熔体热历史对Al0.25Ni0.75合金凝固特性的影响,采用分子动力学模拟的方法模拟了Al0.25Ni0.75合金在不同的凝固初始温度和冷却速率下的凝固过程。实验结果表明:模拟熔点平均值与实际值相差约40.23K;扩散系数与初始温度成正相关;当初始温度从2800K降低到2500K时,Al0.25Ni0.75的平均扩散系数为从5.61×10^-8m^2·s^-1降为3.86×10^-8m^2·s^-1;Al0.25Ni0.75在1.0×10^10K·s^-1的冷却速度开始形成晶体,面心立方结构占89%。
In order to study the effect of melt heat history on the solidification characteristics of Al 0.25 Ni 0.75 alloy,the solidification processes of Al 0.25 Ni 0.75 alloy at different initial solidification temperatures and cooling rates were simulated by the method of molecular dynamics simulation.The experimental results are as follows.The simulated melting point average differed from the actual value by about 40.23 K.The diffusion coefficient is positively correlated with the initial temperature.When the initial temperature is lowered from2800 K to2500 K,the average diffusion coefficient of Al 0.25 Ni 0.75 fell from 5.61×10^-8 m^2·s^-1 to 3.86×10^-8 m^2·s^-1 .Al 0.25 Ni 0.75 began to form crystals at a cooling rate of 1.0×10^10 K·s^-1 ,with the face centered cubic structure accounting for 89%.
作者
刘翠霞
王少刚
坚增运
LIU Cuixia;WANG Shaogang;JIAN Zengyun(School of Materials and Chemical Engineering,Xi’an TechnologicalUniversity,Xi’an 710021,China)
出处
《西安工业大学学报》
CAS
2019年第3期318-323,共6页
Journal of Xi’an Technological University
基金
陕西省教育厅专项科研计划项目(16JK1360)
