Abstract
The objective of our study is to investigate the effect of rapid solidification technology using melt spun process from melt on environmentally free machining Al-0.1Zn alloys with tin-bismuth as free machining constituents. The main purpose of rapid solidification from melt is to have a high strength and thermal stability. Structural and thermal properties have been investigated by x-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimetry (DSC) techniques. Tensile test machine is used to study the mechanical properties such as ultimate tensile strength, elastic constants, yield strength and critical shear stress for free machining alloys. We find the best free machining aluminum alloy that has excellent machinability qualities is Al-0.1Zn-0.5Sn-0.54Bi melt spun alloy because it offers excellent mechanical properties. The highest values of tensile strength (431.5 MPa), yield strength (393.9 MPa), fracture strength (431.6 Mpa), toughness (15.8 × 106 J/m3) generated from Al-0.1Zn-0.5Sn-0.54Bi alloy to meet the needs of free machining aluminum alloy applications.
Highlights
Free machining aluminum alloys are well known in the art
Structural and thermal properties have been investigated by x-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimetry (DSC) techniques
The highest values of tensile strength (431.5 MPa), yield strength (393.9 MPa), fracture strength (431.6 Mpa), toughness (15.8 × 106 J/m3) generated from Al-0.1Zn-0.5Sn-0.54Bi alloy to meet the needs of free machining aluminum alloy applications
Summary
Free machining aluminum alloys are well known in the art These alloys typically include free machining compounds such as lead, tin, indium and bismuth or a combination of these elements for enhancing the machinability. Free machining aluminum alloys are well known in literature [2] [3] These alloys typically include free machining constituents that are insoluble but nonabrasive and soft and they are useful, helping in chip breakage and tool life [2]. In other words, adding tin only makes this alloy brittle and renders it unacceptable where impact properties in a particular application may be important Another drawback associated with free machining alloys containing tin only is a lack of corrosion resistance in environments, where hot brake fluid is present. The addition of tin decreases both the critical temperature for tearing and the hot deformation resistance of a billet during extrusion, and these properties become more critical by increasing the amount of tin [9]
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