基板温度对激光选区熔化制备铁基非晶合金晶化的影响  

Effects of substrate temperature on crystallization of Fe-based amorphous alloy prepared by selective laser melting

作　　者：姜晓月 黄志敏[1] 王璇[1] 张响 杨卫明 刘海顺[1] JIANG Xiaoyue;HUANG Zhimin;WANG Xuan;ZHANG Xiang;YANG Weiming;LIU Haishun(School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学材料与物理学院,徐州221116 [2]中国矿业大学力学与土木工程学院,徐州221116

出　　处：《物理学报》2025年第1期228-234,共7页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2021YFF0600500);国家自然科学基金(批准号:52371167)资助的课题.

摘　　要：激光选区熔化技术有望实现复杂形状非晶合金部件的制造,但晶化现象难以避免.基板是激光选区熔化装置的重要部件,对打印件质量及微观结构有不容忽视的影响,但关于其对打印样品影响的研究还不多见.本文利用分子动力学模拟,在原子尺度探究了Fe_(50)Cu_(25)Ni_(25)非晶合金激光选区熔化过程中基板温度对晶化及原子团簇的影响.研究发现,基板温度低于750 K时,面心立方(FCC)晶相结构的特征键对1421含量及相应的(0,4,4,6)面心立方团簇含量随基板温度升高而明显增加;基板温度接近玻璃转变温度时,键对和团簇的演变同时受玻璃形成能力、熔体和冷却速率等的共同影响.本研究揭示了铁基非晶合金激光选区熔化过程中原子团簇随基板温度的演变及其原子尺度的晶化,为理解与调控非晶晶化提供了新的思路.Selective laser melting(SLM)has potential to prepare complex shaped amorphous alloy parts,however,the almost inevitable crystallization makes it very difficult to obtain excellent performance parts.Most of previous studies focus on improving properties by optimizing parameters such as laser power,scanning speed,and scanning strategy.As is well known,the substrate is an important component in SLM devices,which directly supports and contacts the initial powder and melting pool,affecting the absorption and transfer of heat,the formation and cooling of the melting pool,and therefore exerts a significant influence on the quality and microstructure of printed parts.However,there is relatively little research on its influence.It is important and necessary to understand the influence of substrate temperature on crystallization behavior of Fe-based amorphous alloy during SLM process.Molecular dynamics(MD)simulations can provide direct evidence for the evolution of clusters and band pairs,which can help clarify the crystallization mechanism and alleviate the crystallization.In this work,the influence of substrate temperature on the crystallization and evolution of atomic clusters in Fe_(50)Cu_(25)Ni_(25) amorphous alloy during SLM is investigated on an atomic scale,using MD simulation under different substrate temperatures(300-900 K),laser power values(500-800 eV/ps),and scanning speeds(0.1-1.0 nm/ps).The research results show that when the substrate temperature is lower than 750 K,the content of characteristic bond pair 1421 and the corresponding(0,4,4,6)cluster increase with the substrate temperature rising,thereby increasing face-centered cubic bond pair and cluster and promoting the crystallization.When the substrate temperature rises to a value close to the glass transition temperature,the evolution of bond pairs and clusters becomes complex,which is influenced by the collaborative and competitive effects,such as the ability to form glass,melting and cooling rate.This work reveals the evolution of atomic clusters and

关 键 词：铁基晶非晶合金 激光选区熔化技术 分子动力学模拟 基板温度 晶化 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]