Microstructure and mechanical properties of aluminium alloy cellular lattice structures manufactured by direct metal laser sintering

被引：252

作者：

Yan, Chunze ^{[1
,2
]}

Hao, Liang ^{[2
]}

Hussein, Ahmed ^{[2
]}

Young, Philippe ^{[2
]}

Huang, Juntong ^{[2
]}

Zhu, Wei ^{[2
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China

[2] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 628卷

关键词：

Additive manufacturing; Direct metal laser sintering; Aluminium alloy; Periodic cellular lattice structures; Microstructure; Mechanical properties; DYNAMIC COMPRESSIVE PROPERTIES; POROUS STRUCTURES; FOAMS; BEHAVIOR; TI-6AL-4V; PARTS; SIZE; SLM;

D O I：

10.1016/j.msea.2015.01.063

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study thoroughly investigated the microstructure and mechanical properties of AlSi10Mg periodic cellular lattice structures with a wide range of volume fractions (5-20%) and unit cell sizes (3-7 mm) fabricated via direct metal laser sintering (DMLS). It was found that the arc-shaped melt pools are overlapping with each other and comprising near fully dense struts (relative densities >= 99%) of the as-built lattice structures. The melt pools of the struts are characterized with very fine cellular-dendritic microstructure. Two distinctive zones in the melt pool can be distinguished: the boundary of melt pool possesses the coarse cellular/dendritic microstructure with the cell size or dendrite arm spacing ranging of 2-4 mu m, while the interior of melt pool exhibits the much finer cellular microstructure consisting of the 400-700 nm cells mainly filled with the alpha-Al matrix and some embedded rod-type Si-phases, and the network boundaries predominantly generated by the aggregates of approximately 20 nm Si particles. Both compression strength and microhardness decrease with the increase in the unit cell size when the volume fraction is fixed. This is mainly because the thinner struts of the smaller unit cell size lattice structures were cooled faster by their surroundings and then exhibit a higher cooling rate, leading to finer microstructure. The compression strength increases with increasing the volume fraction, and an equation based on the Gibson-Ashby model is established to estimate the compression strength of DMLS-produced AlSi10Mg gyroid cellular lattice structures with the 3 mm unit cell size. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：238 / 246

页数：9

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