Effect of Wall Thickness on Microstructure and Mechanical Properties of Al-5.8Zn-2.3Mg-1.7Cu Alloy
The influence of wall thickness(5,15,30 and 60 mm)on microstructure and mechanical properties of Al-5.8Zn-2.3Mg-1.7Cu alloy was investigated by optical microscope,scanning electron microscope,Brinell hardness tes-ter and universal material testing machine,combined with self-designed low pressure casting step mold.The results indicate that the microstructure of the alloys with different wall thicknesses is significantly different,where the regions with thinner wall thickness is finer,and the width of intergranular eutectic microstructure becomes narrower with the increase of cooling rate.The mechanical properties of the alloy are increased firstly and then decreased with the increase of wall thickness,achieving optimal results at the thickness of 30 mm,where the hardness,tensile strength and elongation reach 118 HBW,300.26 MPa and 7.55%,respectively.The fracture morphology of the alloy is domi-nated by dimple and cleavage plane.
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NSTL
万方数据
维普
