Abstract
In this study, influences of growth velocity and composition (Fe content) on the microstructure (rod spacing) and mechanical properties (microhardness, ultimate tensile strength and fracture surface) of Al-Mn-Fe ternary alloys have been investigated. Al-1.9 Mn-xFe (x=0.5, 1.5 and 5 wt. %) were prepared using metals of 99.99% high purity in the vacuum atmosphere. At a constant temperature gradient (6.7 K/mm), these alloys were directionally solidified upwards under various growth velocities (8.3-978 µm/s) using a Bridgman-type directional solidification furnace. The results show that two kinds of Al-rich α-Al phase and Fe-rich intermetallic (Al6FeMn) phase may be present in the final microstructures of the alloys when the Fe content increases from 0.5 wt.% to 5 wt.%. Al6FeMn intermetallic rod spacing, microhardness and ultimate tensile strength were measured and expressed as functions of growth velocity and Fe content by using a linear regression analysis method. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples increase with increase in the growth velocity and Fe content and decrease in rod spacing. The elongations of the alloys decrease gradually with increasing growth velocity and Fe content.
Highlights
Among the alloys of the Al–Mn system, known as the 3XXX alloys series, the most widely used is the 3003 alloy[1]
In order to see the effects of the growth velocity and Fe content on the λ, HV and σu, directional solidification experiments were repeated for each compositions of Al–1.9Mn–xFe alloy (x=0.5, 1.5 and 5 wt. %)
In order to observe the effect of growth velocity and Fe content on microstructure and mechanical properties of Al–1.9Mn–xFe alloys, eutectic rod spacings, microhardness and tensile strength of alloys were measured with increasing growth velocity and Fe content
Summary
Among the alloys of the Al–Mn system, known as the 3XXX alloys series, the most widely used is the 3003 alloy[1] Owing to their good conformability, corrosion resistance, weldability, and allied reasonable mechanical resistance, they are becoming very interesting materials. They are commonly used in the shape of plates and sheets, and can be extruded or forged, their use in this form has been limited. One great advantage of these alloys is attributed to their composition variation and the presence of solute in solid solution Their optimum composition has relatively narrow limits, small variations do not substantially affect their manufacture or properties
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