锻压技术

Nd含量对铸锻加工AZ91D镁合金微观组织和力学性能的影响

英文标题：Influence of Nd content on microstructure and mechanical properties of casting and forging AZ91D magnesium alloy

作者：邵海泉李强军

分类号：TG292；TG319

出版年,卷(期):页码：2020,45(6):189-193

摘要：

主要研究了Nd元素含量对铸锻加工的AZ91D镁合金的微观组织和力学性能的影响规律。采用控制变量法分别制备了Nd元素含量为0%，0.2%，0.5%和0.8%的4种试样。通过显微观察发现Nd元素的加入可以细化AZ91D镁合金的晶粒结构，其最佳细化效果出现在Nd元素含量为0.5%时。此外，随着Nd元素的加入，在原合金中广泛存在的β-Mg17-Al12相逐渐减少，并出现Al3Nd等新的第2相组织。通过试样的拉伸试验发现，Nd元素的加入可以提高试样的抗拉强度和屈服强度，并在Nd含量达到0.5%时强化效果最佳，但其对试样伸长率的影响不明显。此外，由于材料微观结构的改变，试样的宏观拉伸断口特征呈现出由脆性断裂向韧性断裂的改变。

The effect of Nd content on the microstructure and mechanical properties of casting and forging AZ91D magnesium alloy was studied. Four samples containing 0%, 0.2%, 0.5% and 0.8% Nd were prepared by the control variable method. It is found that the addition of Nd element can refine the grain structure of AZ91D magnesium alloy, and the best refining effect appears when the content of Nd element is 0.5%. In addition, the β-Mg17-Al12 phase which is widely existed in the original alloy decreases gradually with the addition of Nd, and the new second phase structures such as Al3Nd appeares. Through the tensile test, it is found that the addition of Nd element can improve the tensile strength and the yield strength of sample, and the strengthening effect is the best when the Nd content reaches 0.5%, but its effect on the elongation of sample is not obvious. In addition, due to the change of material microstructure, the macro tensile fracture characteristics of sample show a change from brittle fracture to ductile fracture.

基金项目：

河南省科技攻关项目(142102310549)；河南省科技厅重点科技攻关项目(162102310363)

邵海泉（1984-），男，硕士，讲师 E-mail：hngyshao@qq.com

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