Indexed by:Journal Papers

Date of Publication:2020-01-15

Journal:MATERIALS & DESIGN

Included Journals:EI、SCIE

Volume:186

ISSN No.:0264-1275

Key Words:Laser-arc hybrid additive manufacturing; Wire arc additive manufacturing; Aluminum alloy; Microstructure; Mechanical properties

Abstract:4043 Al-Si alloy samples are fabricated by laser-arc hybrid additive manufacturing and wire arc additive manufacturing. To investigate the influence of laser energy on the fabricated sample, the microstructure evaluation and mechanical properties are studied. After the input of laser energy, there are laser zones with finer grains and reduced Si segregation. As a result, the Si phases at grain boundaries in laser zone are smaller than that in other zones. And it is found that semi-coherent interface between Al and Si phases with crystal orientation relations, [110](Al)parallel to[110](Si) and (111)(Al)parallel to(220)(Si), indicating the Si phase tends to grow along (111)(Al) plane. The results of mechanical properties show that the micro-hardness in laser zone is 54.3 HV0.05, with the increment of 19.08% compared to that in heat-affected zone. And the tensile strength, yield strength and elongation after the input of laser energy are 163.39 +/- 1.68 MPa, 75.60 +/- 4.91 MPa and 17.38 +/- 5.44%, which are 7.56%, 8.45% and 3.45% higher than that without laser. The improved mechanical properties are due to the finer gains, reduced Si segregation and the crack deflection in LAHAM samples. (c) 2019 The Authors. Published by Elsevier Ltd.