Effect of hot rolling deformation on microstructure and mechanical properties of Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er alloy
The Mg-11.8Gd-2.3Y-0.5Zr-0.5Ag-0.4Er(mass fraction,%)alloy was used as experimental material to study the effects of different hot rolling deformations on the microstructure and properties.The results show that the Schmidt factor of non-basal slip systems increases and the twins decrease when the hot rolling deformation increases from 20%to 40%.With the hot rolling deformation increases,the average Schmid factor(Fs)of non-basal slip systems decreases and the twins increases.Proper hot rolling deformation can induce the non-basal slips,and inhibit the basal slip and twinning.The alloy with hot rolling deformation of 40%has the highest yield strength(290 MPa)and the lowest elongation(8.5%),because of the non-basal slips of alloy become active,the dislocation density increases,the twins decrease.On contrast,when the hot rolling deformation increases to 60%,the non-basal slips of alloy become active,the dislocation density decreases and the twins increase,the yield strength decreases to 230 MPa,and the elongation reaches 12.9%.It proves that adjusting dislocation slip and twinning by controlling hot rolling deformations is helpful to improve the comprehensive mechanical properties of rare earth Mg alloy with high Gd content.
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