Dispersoid characteristics and elevated temperature creep resistance of Al–Si–Mg cast alloy with Zr addition

The present work aims to reveal the dispersoids evolution and valuable role of Zr on elevated-temperature creep resistance Al–7Si-0.3Mg alloy. At 300°C 25 MPa, Al–7Si-0.3Mg-0.15Zr alloy exhibits more than double decrement in minimum rate, 263 h increment time-to-fracture compared Zr-free cast These effects were owe formation novel nanobelt-like Si2Zr rectangle-like (Al, Si)3–Zr during solutionising at 560°C for 20 h. Si atoms could substitute Al sites form stable L12-Al2Si1Zr structure. thermally semi-coherent/coherent with matrix, which impeded movement dislocations deformation 300°C. It demonstrated that superior (300°C) achieved Al–7Si-0.3Mg-0.16Zr was attributed introduction Zr-containing dispersoids.