Microstructural heterogeneity and bonding strength of planar interface formed in additive manufacturing of Al-Mg-Si alloy based on friction and extrusion  

作　　者：Wenshen Tang Xinqi Yang Chaobo Tian Yongsheng Xu 

机构地区：[1]Tianjin Key Laboratory of Advanced Joining Technology,School of Materials Science and Engineering,Tianjin University,Tianjin 300354,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第9期1755-1769,共15页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51775371 and 52175356);the Tianjin Natural Science Foundation,China(No.19JCZDJC39200);the Tianjin Research Innovation Project for Postgraduate Students,China(No.2021YJSO2B03)。

摘　　要：Single-pass deposits of 6061 aluminum alloy with a single-layer thickness of 4 mm were fabricated by force-controlled friction-and extrusion-based additive manufacturing.The formation characteristics of the interface,which were achieved by using a featureless shoulder,were investigated and elucidated.The microstructure and bonding strength of the final build both with and without heat treatment were explored.A pronounced microstructural heterogeneity was observed throughout the thickness of the final build.Grains at the interface with Cu,{213}<111>,and Goss orientations prevailed,which were refined to approximately 4.0μm.Nearly all of the hardening precipitates were dissolved,resulting in the bonding interface displaying the lowest hardness.The fresh layer,subjected to thermal processes and plastic deformation only once,was dominated by a strong recrystallization texture with a Cube orientation.The previous layer,subjected twice to thermal processes and plastic deformation,was governed by P-and Goss-related components.The ultimate tensile strength along the build direction in asdeposited and heat-treated states could reach 57.0%and 82.9%of the extruded 6061-T651 aluminum alloy.

关 键 词：solid-state additive manufacturing aluminum alloy PRECIPITATE crystallographic texture heat treatment 

分 类 号：TG146.21[一般工业技术—材料科学与工程]