摘要
应用分子动力学对液态Ti_(100-x)Al_(x)(x=10,25,50,75,90)合金的快速凝固过程进行了模拟,并通过双体分布函数和HA键型指数法分析了凝固过程中熔体微观结构的演变特性。合金平均原子体积随温度变化的曲线表明,在5×10^(12)K/s冷速下,合金都形成了非晶结构;合金在降温过程中的双体分布函数显示出非晶的典型特征;合金成分对于微观结构和非晶形成能力有显著影响,Ti_(25)Al_(75)合金的非晶形成能力最强,同时含有最多的表征二十面体结构的键对。
The rapid solidification process of liquid Ti_(100-x)Al_(x)(x=10,25,50,75,90)alloys was simulated by using molecular dynamics.And the evolution characteristics of melt microstructure during solidification were analyzed by the double body distribution function and HA(Honeycutt-Anderson)bond type index method.The curves of the average atomic volume with temperature show that at the cooling rate of 5×1O^(12) K/s,all rapidly solidified alloys are amorphous.The double-body distribution function of the alloy during cooling shows the typical characteristics of amorphous.The alloy composition has significant influence on microstructure and amorphous forming ability.The Ti_(25)Al_(75) alloy has the strongest amorphous forming ability and contains the most bond pairs that characterize the icosahedral structure.
作者
李东泽
LI Dongze(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《热加工工艺》
北大核心
2022年第3期73-77,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51671133)。
