Rapid production of AZ91 Mg alloy by extrusion based additive manufacturing process. (20th October 2021)

• Record Type: Journal Article
• Authors: Vishwanath, A.S.; Rane, K.; Schaper, J.; Strano, M.; Casati, R.
• Is Part Of: Powder metallurgy. Volume 64:Number 5(2021)
• Page Start: 370
• Page End: 377
• Publication Date: 2021-10-20
• Subjects: Additive manufacturing -- magnesium -- AZ91 -- microstructure -- DSC -- electron microscopy; Powder metallurgy -- Periodicals; 671.3705
• DOI: 10.1080/00325899.2021.1911457
• Languages: English
• ISSNs: 0032-5899

Abstract

ABSTRACT: AZ91 magnesium alloy parts were successfully produced using a novel extrusion-based additive manufacturing process. The green parts were built in two different orientations and subjected to debinding and sintering treatments. The as-built alloy showed a heterogeneous microstructure made up of α – Mg matrix, Al8 Mn5 second phase particles, MgO layers and Mg17 Al12 continuous precipitates. After solution treatment followed by aging, Mg17 Al12 discontinuous precipitates were observed. The sintered samples showed a yield strength and ultimate tensile strength of 79 and 207 MPa, respectively, in the horizontal configuration. Analysis of the fracture surfaces revealed that a continuous network of magnesium oxide layer around the powder particles act as preferential path for crack propagation.