Mg 97 Zn 1 Y 2 magnesium alloy was hot-rolled at different temperatures from 390 to 480°C; the effect of rolling temperature on microstructure evolution and mechanical properties of Mg 97 Zn 1 Y 2 magnesium alloy was investigated using x-ray diffraction (XRD), laser optical microscopy (LOP), transmission electron microscopy (TEM), and tensile test. The results showed that in the multipass process, the rolling temperature had significant effect on the microstructures and tensile properties for the hot-rolled Mg 97 Zn 1 Y alloy. As the rolling temperature was increased, the original strengthening phase-Mg 12 YZn in as-cast Mg 97 Zn 1 Y 2 alloy experienced an evolution from dissolution to precipitation, i.e. from chain-shaped Mg 12 YZn phase together with a little lamellar structure at 420°C to a maximum volume fraction of lamellar structure at 450°C, and finally to a reduced volume fraction of lamellar structure at 480°C. For Mg 97 Zn 1 Y 2 alloy hotrolled in the temperature range of 390-450°C, the tensile strength was at a high level with yielded strength of about 300 MPa and ultimate strength of about 320 MPa. The highest yielded strength was 317 MPa after hot-rolling at 450°C; the elongation was the highest up to 5.5% after hot-rolling at 420°C.
An attempt has been made to enhance the tribological properties of Mg-11Y-2?5Zn alloy by laser surface melting with a 6 kW continuous wave CO 2 laser processing system. The microstructure and microhardness of the surface layer on Mg-11Y-2?5Zn alloy were characterised using X-ray diffractometer, laser microscopy and Vickers hardness indentation. The laser surface melted zone consisted of fine dendrites and coarse dendrites growing epitaxially from the liquid/solid interface. Microhardness was improved from 69-70 HV for the substrate to 77-83 HV for the fine dendritic microstructure. The friction and wear characteristics were investigated using a pin on disc apparatus. The coefficient of friction curve of the laser surface melted specimen was similar to that of the untreated specimen. Laser surface melted Mg-11Y-2?5Zn alloy exhibited good wear resistance, which has been explained by refinement of microstructure in the melted zone. Four wear mechanisms including abrasion, delamination, thermal softening and melting, have been observed.
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