首页|In-situ study of damage mechanisms in Mg-6Li dual-phase alloy

In-situ study of damage mechanisms in Mg-6Li dual-phase alloy

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Interfaces play a crucial role in influencing the mechanical properties of Mg alloys.For Mg-Li dual-phase alloy,the type of interfaces is complex,which includes both grain boundary and phase boundary,and the influence of such interfaces on the damage nucleation is yet to be explored.In this paper,in-situ scanning electron microscopy(SEM)based measurements were carried out to investigate the meso-scale damage nucleation mechanisms of the Mg-6Li dual-phase alloy.Results show that 94.8％of cracks are nucleated at the α-Mg grain boundary in the post-uniform elongation stage,while 5.2％are at phase boundary and almost no crack at the β-Li grain boundary.The initiation of α-Mg grain boundary cracks is attributed to strain incompatibility,which induces micro-strain localization,and then causes grain boundary sliding(GBS)and crack nucleation.Deformation compatibility analysis reveals that the geometric compatibility factor(Mk)can be used to predict the nucleation of α-Mg grain boundary crack.When Mk is lower than 0.075,α-Mg grain boundary cracks tend to form.Few cracks are generated at the phase boundary is due to the mild strain partitioning between α-Mg phase and β-Li phase and may also be partly attributed to multiple slip systems in body-centered cubic(BCC)-structured β-Li phase,which can accommodate well with the deformation of adjacent α-Mg phase.

Crack nucleationStrain localizationGrain boundary slidingPhase boundaryMg-6Li dual-phase alloy

Jing Li、Li Jin、Sangbong Yi、Xin Zhang、Jie Dong、Ming Luo

展开 >

Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University),Ministry of Industry and Information Technology,Xi'an 710072,China

Engineering Research Center of Advanced Manufacturing Technology for Aero Engine,Ministry of Education,Northwestern Polytechnical University,Xi'an 710072,China

National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,School of Materials Science and Engineering,Shanghai Jiao Tong Uni

National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

Institute of Materials and Process Design,Helmholtz-Zentrum Hereon,Geesthacht 21502,Germany

展开 >

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

5200541252305506U2241231D5000230081

2024

10.1016/j.jmst.2023.09.018

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.179(12)
  • 61