| Abstrakt: |
The investigation aims to study the microstructure and mechanical property changes of various silicon added WE43 alloys. With the increase in Si addition, the Mg2Si phase forms randomly in grains apart from the formed neodymium and yttrium rich phases like Mg24Y5 and Mg41Nd5. The morphology of the eutectic Mg2Si phase changes to a tiny needle shape on 0.5% addition of silicon and upon 1%, it again transforms to a Chinese script phase when the addition increases above 1%, along with the formed eutectic Mg2Si phase, polygonal primary Mg2Si phase. Simultaneously, a new intermetallic was developed based on the quantity of silicon addition; at lower silicon addition, it's a star-shaped compound and in higher addition, rare earth silicon intermetallic phase was formed, which is confirmed through scanning electron microscopy analyses. The hardness of WE43 alloy varies from 77 to 97 BHN; the YS (162 MPa), UTS (196 MPa) and % E (4.94%) gradually decline as silicon addition exceeds 1%. Silicon minimizes dislocations and strain flow locations, whereas the improved characteristics are likely due to solid solution strengthening and grain refinement. [ABSTRACT FROM AUTHOR] |
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