Development of gradient microstructure in the lattice structure of AlSi10Mg alloy fabricated by selective laser melting

作     者：Mulin Liu Naoki Takata Asuka Suzuki Makoto Kobashi Mulin Liu;Naoki Takata;Asuka Suzuki;Makoto Kobashi

作者机构：Department of Materials Process EngineeringGraduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya464-8603Japan 

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

年 卷 期：2020年第36卷第1期

页      面：106-117页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：support of the“Knowledge Hub Aichi”a Priority Research Project of Aichi Prefectural Government Japan 

主　　题：Additive manufacturing Lattice structure Aluminum alloy Microstructure Thermal conductivity 

摘      要：To identify the microstructural features of the lattice structures of Al alloys built via the selective laser melting(SLM)process,AlSil OMg alloy with a body-centered cubic(BCC)-type lattice structure was *** microstructures comprising melt pools with several columnarα-Al phases withorientations along the elongation direction and surrounded by eutectic Si particles were observed at all portions of the built lattice *** the node portions of the lattice structure,a gradient microstructure(continuous change in microstructure)was *** columnarα-Al phases were observed near the top surface of the node portion,whereas they became coarser and more equiaxed near the bottom surface,resulting in softening localized near the bottom *** the strut portions of the lattice structure,the columnarα-Al phases were elongated along the inclined direction of *** trend was more prevalent near the bottom ***α-Al phases became coarser and more equiaxed near the bottom surface as *** aforementioned results were the basis of a discussion of the development of the gradient microstructure in lattice-structured Al alloys during the SLM process in terms of thermal conductivities at the boundaries between the manufactured(locally melted and rapidly solidified)portions and adjacent(unmelted)alloy powder.