Microstructure and Mechanical Properties of Cast Composites of Steel Wool Infiltrated by Magnesium and AZ91 Alloy

Abstract

In the present study, composites have been synthesized by infiltration of 0.15 wt% carbon steel wool by molten magnesium and AZ91 alloy, which solidifies by cooling under vacuum. The microstructure of the composites observed on a plane normal to the direction of flow shows the transverse section of steel wool strands mostly and clustering of these strands due to pushing by stream of melt during infiltration. The composite based on AZ91 alloy shows network of precipitates of Mg 17 Al 12 along the boundaries of dendrite cells in the matrix, which are significantly finer compared to that in the cast AZ91 alloy. The microhardness of the steel wool in the composite increases with increasing steel wool content, which has been attributed to increased restraining influence of steel wool at higher steel wool content on the plastic flow of the surrounding matrix. The ultimate tensile strength (UTS) is higher in the AZ91 alloy-based composite compared to those observed in the composites based on commercial magnesium, at comparable steel wool content, and the strength increases with increasing steel wool content although densities of the composites increases as well.

The Effect of Inoculation on Properties of Modified Ductile Ni-Resist Alloy

“…The microstructure of the samples was characterized using SEM model Jeol Jsm 6380LA, equipped with Energy Dispersive x-ray Spectroscopy (EDS) model Philips XL40 and X-ray Diffraction (XRD) analysis model Siemens D500. Elements' constituent technique was adopted and followed [14][15][16][17][18][19][20]. Based on metallograph of 100 x magnifications, the amount of the various constituents including nodule graphite, carbide and austenite in the microstructure was measured using the image-analyzer of the Video Technology (VT) software.…”

Effect of PyC coating on mechanical properties of Cf/AZ91D composites

“…Based on the concept of saving the limited resources and reducing environmental pollution, continuous carbon fibres reinforced Mg matrix composites have attracted huge interest for their high specific strength and modulus, high specific stiffness, low coefficient of thermal expansion [1][2][3], as one of light and high-performance materials that have been widely used in automotive and aviation fields. However, carbon fibres have an excessive smoothness and fewer adsorption characteristics always lead to poor adhesion with magnesium matrix.…”

“…Furthermore, the interface reaction between fibres and magnesium matrix can introduce defects that significantly decrease the fibre strength. The former one will degrade the load transfer from fibre to the matrix and the structural integrity of C f /Mg composites [1][2][3][4]. The latter one will influence the fully reinforce function of carbon fibres as the main reinforcers of composites, which leads to the decrease of the ultimate properties of composites, particularly for the fibre-dominated strength [4].…”

Influence of Flux on Melting Characteristics and Surface Quality of In-Situ Melting AZ91D

“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions INTRODUCTION Magnesium cast alloys, predominantly AZ91D which is a high-purity alloy with attractive mechanical and physical properties and excellent castability, have found wide applications in automotive, aerospace, and computer industries [1][2][3]. The current economic production demands, as well as the needs for high precision components, encourage researchers to investigate new ideas to find out suitable alternative processes.…”