锻压技术

热挤压态Mg-10Gd-4Y-0.5Zr合金的时效析出

英文标题：

作者：张小翠

分类号：TG166.4

出版年,卷(期):页码：2024,49(2):241-246

摘要：

为提高热挤压态Mg-10Gd-4Y-0.5Zr合金的力学性能，并获得该合金的最佳时效工艺参数，以热挤压态Mg-10Gd-4Y-0.5Zr合金为研究对象，探究了在200 ℃时效温度下不同时效时间对其硬度和析出相的影响规律。结果表明：在等温时效过程中，随着时效时间的延长，合金的硬度先降低再逐渐增大，在96 h时达到峰值后又逐渐下降;当时效6 h后，晶粒内残存大量位错线，晶粒内生成少量尺寸较小的β′相，此时为欠时效态；随着时效时间的延长，β′相沿着<101-0>α方向逐渐扩展长大，数量逐渐增多；当时效96 h后，β′相的密度达到最大，并逐渐连接，此时为峰值时效态；当时效120 h后，在晶界处生成尺寸大约为88 nm×237 nm的椭圆状β相，此时为过时效态。

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.

基金项目：

作者简介：张小翠（1984-），女，硕士，副教授

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