对铸态Mg-9Gd镁合金挤压变形后再进行不同的热处理，研究了不同处理后Mg-9Gd镁合金的组织与力学性能。结果表明：挤压态Mg-9Gd合金的显微组织由大量的细小等轴晶粒和少量中间相组成，中间相破碎成大量细小的块状颗粒，沿平行于应力方向呈带状分布；相比铸态合金，挤压态合金的巩提高了89．8％，σ0．2提高了44．1％，δ达到了19．5％；挤压态合金经520℃×2h＋200℃×8h处理后，强度和塑性降低，σb，σ0．2分别为231．4，129．3MPa，d为15．2％；经200℃×14h处理后，挤压态合金的强度明显提高，σb，σ0．2分别达到254．2，180．3MPa，但塑性进一步降低，艿为10．5％。
The as-cast Mg-9Gd alloy was extruded, and then was hot treated, the microstructure and mechanical properties of the Mg-9Gd alloy after different treatments were studied. The results show that the extruded alloy contained amounts of refine equiaxed grains and a small number of intermediate phases, and the later was broken to massive block particles along the stress direction distribution in belt. Comparing with the as-cast alloy, the tensile strength (σb) and the yield strength (a0.2) of the extruded alloy increased by 89. 8% and 44. 1% , and the elongation reached to 19. 5%. The σb, σ0.2 decreased after the extruded alloy was treated by 520 ℃ ×2 h+ 200 ℃ × 8 h, and the σb, σ0.2 were 231.4, 129. 3 MPa, and δ was 15.2%. The aging treatment of 200 ℃× 14 h obviously enhanced the strength, σb and a0.2 up to 254. 2 MPa and 180. 3 MPa, but the plasticity decreased further, and δ was 10. 5 %.
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