研究了Mg⁃Gd⁃Zr挤压态合金在450℃和500℃退火过程中的晶粒生长和织构演变。结果表明：Mg⁃Gd⁃Zr挤压态合金在退火过程中晶粒正常长大，在500℃退火比在450℃退火时晶粒长大的速度快得多。 Mg⁃Gd⁃Zr合金挤压后形成了〈0001〉／／ED、〈1010〉／／ED和〈1120〉／／ED三种织构。 Mg⁃Gd⁃Zr挤压合金在450℃退火，退火时间从20～60 min，〈0001〉／／ED织构的强度逐渐增加。 Mg⁃Gd⁃Zr合金在500℃退火时，〈0001〉／／ED织构的强度在退火20 min即达到最大值，在随后的退火过程中逐渐减弱，〈1120〉／／ED织构在退火过程中得到了很大程度的增强。%The grain growth and texture evolution of the extruded Mg⁃Gd⁃Zr alloy annealed at 450 ℃ and 500 ℃ were investigated. The results show that normal grain growth takes place in the Mg⁃Gd⁃Zr alloy during annealing, and the grains of the extruded Mg⁃Gd⁃Zr alloy annealed at 500 ℃ grow much faster than those annealed at 450 ℃. The texture of the extruded Mg⁃Gd⁃Zr alloy is formed by〈0001〉//ED,〈1010〉//ED and〈1120〉//ED texture components. During annealing at 450 ℃ for 20 min to 60 min, the intensity of the 〈0001〉//ED texture increases. When annealing at 500 ℃, the extruded Mg⁃Gd⁃Zr alloy receives the maximum intensity of the〈0001〉//ED texture after annealing for 20min, but then the intensity of this texture decreases with annealing time. The intensity of〈1120〉//ED texture increases remarkably during annealing at 500 ℃.
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