冷速对NiCrAlFe合金凝固组织微观结构的影响  

Effects of Cooling Rate on Solidification Microstructure of NiCrAlFe Alloy

作　　者：李亚敏[1,2] 毛德成[1] 范树通 刘洪军 LI Yamin;MAO Decheng;FAN Shutong;LIU Hongjun(Department of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050;State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《特种铸造及有色合金》2025年第1期71-79,共9页Special Casting & Nonferrous Alloys

基　　金：甘肃省教育科技创新资助项目(2023A-028)。

摘　　要：采用分子动力学对NiCrAlFe合金在1×10^(11)~1×10^(14)K/s冷速下的快速凝固过程进行了模拟,并通过平均势能、径向分布函数和最大标准团簇分析法等研究了该合金凝固过程微观结构的演变特征。结果表明,该合金凝固的临界冷速约为4×10^(12)K/s,高于该冷速时体系中非晶原子(TCP原子)占主要地位,低于该冷速时体系会大量结晶,形成以FCC原子为主的晶体结构。对于结晶化的体系,1×10^(12)K/s冷速下形成的晶体结构有序度最优;2×10^(11)K/s冷速下会形成复杂的五重孪晶结构,导致该冷速下体系结构的有序度较低。说明冷却速度对合金凝固组织的微观结构有显著影响。The rapid solidification process of NiCrAlFe alloy at cooling rates from 1×10^(11) K/s to 1×10^(14) K/s was car⁃ried out by molecular dynamics,and microstructure evolution characteristics of the alloy during solidification process were investigated through average potential energy,radial distribution function,and the largest standard cluster analy⁃sis.The results indicate that the critical cooling rate of NiCrAlFe alloy is about 4×10^(12) K/s,above which the amor⁃phous atoms(TCP atoms)dominate the system,while a large amount of crystallization is generated when the cooling rate is lower than 4×10^(12) K/s,forming a crystal structure mainly composed of FCC atoms.For the crystallized system,the crystal structure order reaches the optimal at 1×10^(12) K/s,and a complex five-fold twin structure is formed at 2×10^(11) K/s,resulting in a lower order degree.Therefore,cooling rate has a significant impact on the solidification micro⁃structure of alloy.

关 键 词：NiCrAlFe合金 快速凝固 显微组织 分子动力学 

分 类 号：TG132.2[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—合金]