通过添加钙对挤压态AZ91-0.4Ce镁合金微观结构和力学性能的改性

Modification of Microstructure and Mechanical Properties of Extruded AZ91-0.4Ce Magnesium Alloy through Addition of Ca.

作者信息

Ni Fengtao, Peng Jian, Liu Xiangquan, Gao Pan, Nie Zhongkui, Hu Jie, Zhao Dong

机构信息

State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.

Jiaozuo Gaozhao Magnesium Alloy Co., Ltd., Jiaozuo 454950, China.

出版信息

Materials (Basel). 2024 Jul 8;17(13):3359. doi: 10.3390/ma17133359.

DOI:10.3390/ma17133359

PMID:38998439

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11243162/

Abstract

The effect of the addition of alkali earth element Ca on the microstructure and mechanical properties of extruded AZ91-0.4Ce-xCa (x = 0, 0.4, 0.8, 1.2 wt.%) alloys was studied by using scanning electron microscopy, transmission electron microscopy, and tensile tests. The results showed that the addition of Ca could significantly refine the second phase and grain size of the extruded AZ91-0.4Ce alloy. The refinement effect was most obvious when 0.8 wt.% of Ca was added, and the recrystallized grain size was 4.75 μm after extrusion. The addition of Ca resulted in the formation of a spherical AlCa phase, which effectively suppressed the precipitation of the β-MgAl phase, promoted dynamic recrystallization and grain refinement, impeded dislocation motion, and exerted a positive influence on the mechanical properties of the alloy. The yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of the AZ91-0.4Ce-0.8Ca alloy were 238.7 MPa, 338.3 MPa, and 10.8%, respectively.

摘要

通过扫描电子显微镜、透射电子显微镜和拉伸试验，研究了添加碱土元素Ca对挤压态AZ91-0.4Ce-xCa（x = 0、0.4、0.8、1.2 wt.%）合金微观结构和力学性能的影响。结果表明，添加Ca可显著细化挤压态AZ91-0.4Ce合金的第二相和晶粒尺寸。当添加0.8 wt.%的Ca时，细化效果最为明显，挤压后再结晶晶粒尺寸为4.75μm。添加Ca导致形成球形AlCa相，有效抑制了β-MgAl相的析出，促进了动态再结晶和晶粒细化，阻碍了位错运动，对合金的力学性能产生了积极影响。AZ91-0.4Ce-0.8Ca合金的屈服强度（YS）、抗拉强度（UTS）和伸长率（EL）分别为238.7 MPa、338.3 MPa和10.8%。