Transactions of Materials and Heat Treatment

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ClassificationCode：TG166.4

year,vol(issue):pagenumber：2024,49(2):241-246

Abstract：

In order to improve the mechanical properties of hot extruded Mg-10Gd-4Y-0.5Zr alloy and obtain the optimal aging process parameters of the alloy, for the hot extruded Mg-10Gd-4Y-0.5Zr alloy, the influences of different aging time on its hardness and precipitated phase at the aging temperature of 200 ℃ were mainly studied. The results show that during the isothermal aging process, with the aging time increases, the hardness of alloy first decreases and then gradually increases, reaching a peak at 96 h, and then gradually decreasing. After aging for 6 h, many dislocation lines remain in the grains, and a small amount of smaller β′ phase is also generated in the grains, which is in an under-aging state. As the aging time increases, β′ phase gradually expands and grows along <101-0 >α direction, the number gradually increases, and after aging for 96 h, the density of β′ phase reaches the maximum and gradually connects, which is the peak aging state. After aging for 120 h, the elliptical β phase with a size of approximately 88 nm×237 nm is generated at the grain boundary, which is the over-aging state.

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作者简介：张小翠（1984-），女，硕士，副教授

Reference：

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