Mg-Zn合金析出相的结构、力学和电子特性

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中文摘要：为了加快镁(Mg)合金的开发和设计,通过实验和密度泛函理论研究Mg-Zn合金中重要析出相的结构和力学性能.纳米压痕试验显示,析出相硬度随锌含量的增加先增加后降低,且明显高于纯镁和锌的硬度.计算结果显示,析出相的稳定性随着锌含量的增加先增加后降低.析出相的体积模量随着锌含量的增加而增大,而其剪切模量和杨氏模量随着锌含量的增加先增大后减小.这些化合物延展性由高到低的顺序为MgZn2＞Mg21Zn25＞Mg2Zn11＞Mg4Zn7.这些化合物的表面轮廓表明其具有明显的各向异性.共价键的共价程度和键长随锌含量的增加先增大后减小.

外文标题：Structural,mechanical and electronic properties of precipitates in Mg-Zn alloys

外文摘要：To accelerate the development and design of magnesium(Mg)alloys,the structural and mechanical properties of important precipitates in Mg-Zn alloys were studied by experiments and density functional theory.The nano-indentation tests revealed that the hardness of the precipitates initially increased and then decreased with increasing Zn content,and was significantly higher than that of pure Mg and Zn.The calculation results revealed that the precipitates stability initially increased and then decreased with increasing Zn concentration.The bulk moduli of the precipitates increased,whereas their shear and Young's moduli initially increased and then decreased with increasing Zn content.The decreasing order of ductility for these compounds is MgZn2＞Mg21Zn25＞Mg2Zn11＞Mg4Zn7.The surface profiles of the compounds revealed that they are obvious anisotropy.Both the degree of covalency and bond length of covalent bonds initially increased and then decreased with increasing Zn content.

外文关键词：

Mg-Zn alloynano-indentationmodulushardnesschemical bonding

作者：

张添植、刘洋赈、符青云、郭柏松、金卫红、于振涛

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作者单位：

暨南大学先进耐磨蚀及功能材料研究院,广州 510632

暨南大学韶关研究院,韶关 512027

南方医科大学口腔医院,广州 510280

关键词：

镁锌合金纳米压痕模量硬度化学键

基金：

Guangdong Basic and Applied Basic Research Foundation,ChinaGuangdong Basic and Applied Basic Research Foundation,ChinaGuangdong Basic and Applied Basic Research Foundation,China

项目编号：

2020B15151200782020A15151110672021A1515010890

出版年：

2024

DOI：

10.1016/S1003-6326(24)66556-8

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(8)