Change in microstructural characteristics of laser powder bed fused Al–Fe binary alloy at elevated temperature

作     者：Xing Qi Naoki Takata Asuka Suzuki Makoto Kobashi Masaki Kato Xing Qi;Naoki Takata;Asuka Suzuki;Makoto Kobashi;Masaki Kato

作者机构：Department of Materials Process EngineeringGraduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Aichi Center for Industry and Science Technology1267-1 AkiaiYakusa-choToyota 470-0356Japan 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第97卷第2期

页      面：38-53页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supports of“Knowledge Hub Aichi”,a Priority Research Project of the Aichi Prefectural Government(Japan) JSPS KAKENHI(Grant Numbers 20H02462,Japan) the fellowship of the China Scholarship Council(No.201806890005) 

主　　题：Al-Fe alloy Laser powder bed fusion Phase transformation Microstructure Tensile properties 

摘      要：The present study addressed the change in the microstructure of Al-2.5 wt%Fe binary alloy produced using laser powder bed fusion(L-PBF)technique by thermal exposure at 300℃,and the associated mechanical and thermal properties were systematically examined as ***-semi-cylindrical patterns corresponding to melt pools in the microstructure were macroscopically observed for the asmanufactured *** change in the melt-pool morphology was observed after thermal exposure for1000 *** the melt pools,a large number of the nanoscale metastable Al6 Fe phase particles were uniformly distributed inside columnar grains of theα-Al matrix containing concentrated solute Fe in *** sequential formation and coarsening of stableθ-Al13 Fe4 phases were observed upon exposure to a 300℃ environment,but a considerable amount of nano-sized metastable Al6 Fe phases remained even after 1000 ***,the thermal exposure continuously reduced the concentration of solute Fe atoms in theα-Al *** significant grain growth was found inα-Al matrix after 1000 h owing to the pinning effect of the dispersed fine particles on grain boundary *** results demonstrate a sluggish change in microstructural morphologies of the Al-2.5 wt%Fe *** quantified microstructural parameters addressed dominant strengthening contributions by the solid solution of Fe element and Orowan strengthening mechanism by fine Al-Fe intermetallics in the L-PBF-produced *** high strength level was sustained even after being exposed to 300℃ for long *** superior balance of mechanical properties and thermal conductivity can be achieved in the experimental alloys by taking advantage of the various microstructural parameters related to the Al-Fe intermetallic phases andα-Al matrix.