A detailed microstructural and corrosion analysis of magnesium alloy WE43 manufactured by selective laser melting
Artikel i vetenskaplig tidskrift, 2020

The production of magnesium alloy WE43 was achieved by selective laser melting (SLM). The alloy was investigated after SLM, hot isostatic pressing (HIP), and solutionising heat treatment. The microstructure and corrosion behaviour of the specimens were carefully characterised, whilst assessed and contrast relative to the conventionally cast alloy counterpart. The SLM prepared specimens possess a unique microstructure comprising fine grains growing with a strong [0001] texture along the building direction with a low fraction of process-induced and metallurgical defects, reaching < 0.1 %, after optimising the SLM parameters and the HIP treatment. Electrochemical measurements demonstrated that the SLM prepared WE43 is cathodically more active as compared with its cast counterpart. It is proposed that this behaviour is due to a high density of zirconium-rich oxide particles uniformly distributed throughout the alloy microstructure as well as the alterations in the chemical composition of the solid-solution matrix originating from the high cooling rates of SLM. It was also noted that the oxide particles are mainly sourced by powder. The present results suggest that the corrosion of SLM prepared Mg alloys could be greatly improved once the influence of powder characteristics is further understood and controlled.

Selective laser meltingMagnesium alloyWE43CorrosionMicrostructure

Författare

M. Esmaily

Monash University

Massachusetts Institute of Technology (MIT)

Z. Zeng

Monash University

Anna N. Mortazavi

Harvard University

Monash University

A. Gullino

Politecnico di Torino

Monash University

S. Choudhary

Monash University

T. Derra

Meotec GmbH

F. Benn

Meotec GmbH

F. D'Elia

Meotec GmbH

M. Müther

Meotec GmbH

S. Thomas

Monash University

A. Huang

Monash University

A. Allanore

Massachusetts Institute of Technology (MIT)

A. Kopp

Meotec GmbH

Nick Birbilis

Australian National University

Additive Manufacturing

2214-8604 (eISSN)

Vol. 35 101321

Ämneskategorier

Annan kemi

Metallurgi och metalliska material

Korrosionsteknik

DOI

10.1016/j.addma.2020.101321

Mer information

Skapat

2020-11-12