Transactions of Materials and Heat Treatment

Title：Influence of Nd content on microstructure and mechanical properties of casting and forging AZ91D magnesium alloy

Authors： Shao Haiquan Li Qiangjun

Unit： Henan Polytechnic Institute Henan University

KeyWords： Nd element AZ91D magnesium alloy casting and forging process microstructure mechanical properties

ClassificationCode：TG292；TG319

year,vol(issue):pagenumber：2020,45(6):189-193

Abstract：

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.

Funds：

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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