|
| Effect of Laser Surface Treatment on Bending Deformation and Notch Toughness of Industrial-grade Zr-based Bulk Metallic Glasses |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.05.012 |
| KeyWord:industrial-grade bulk metallic glass laser surface treatment bending deformation fracture strength notch toughness high-strength lightweight materials |
| Author | Institution |
| CHENG Yang-yang |
China Academy of Aerospace Science and Innovation, Beijing , China |
| ZHONG Yong |
Southwest Institute of Technology and Engineering, Chongqing , China |
| JIA Yi |
China Academy of Aerospace Science and Innovation, Beijing , China |
| WANG Peng-fei |
China Academy of Aerospace Science and Innovation, Beijing , China |
| CHEN Chen |
Zhengzhou University, Zhengzhou , China |
| ZHANG Tao |
Beihang University, Beijing , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Considering that the positive effect of laser surface treatment (LSM) on the plasticity of bulk metallic glasses (BMGs) and the economy of selection on aeronautical materials, the work aims to study the effect of LSMs on the bending deformation and toughness of industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMGs. Industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMGs were obtained through low purity raw materials and low vacuum preparation conditions. Considering that the specimens were subjected to both tensile and compressive normal stress states under the bending condition, the effects of different treatment processes and different laser treated surfaces on the bending deformation and toughness of the specimens were studied. When the laser-treated surfaces were located on the two lateral surfaces of the bending specimen, it had no significant effect on the plastic deformation and fracture strength of the specimen, but it significantly reduced the notch toughness of the specimen from (56.4±3.4) MPa.m1/2 to (26.2±4.8) MPa.m1/2. When the laser-treated surface was located on the tensile side of the bending specimen, the bending fracture strength of the specimen decreased from 2 150 MPa to 1 800 MPa. When the laser-treated surface was located on the compressive side of the bending specimen, the bending fracture strength of the specimen increased from 2 150 MPa to 2 550 MPa, but there was no significant effect on its notch toughness. The effects of the compositional changes and residual stress induced by LSM for the industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMGs on the bending mechanical behavior and notch toughness are closely related to the stress state. The positive coupling of the residual stress and the external loading stress can amplify the effect of external loading stresses. Meanwhile, the compositional differences between the surface and the central part may appear as stress concentration points, thus leading to the formation of crack sources and reducing the fracture strength of the specimen. |
| Close |
|
|
|