程杨洋,钟勇,张星,陈辰,余龙,王鹏飞,张涛.激光表面处理对工业级锆基块体非晶合金塑性变形能力的影响[J].表面技术,2024,53(5):166-173, 183.
CHENG Yangyang,ZHONG Yong,ZHANG Xing,CHEN Chen,YU Long,WANG Pengfei,ZHANG Tao.Effect of Laser Surface Treatment on Plastic Deformation of Industrial-grade Zr-based Bulk Metallic Glasses[J].Surface Technology,2024,53(5):166-173, 183 |
| 激光表面处理对工业级锆基块体非晶合金塑性变形能力的影响 |
| Effect of Laser Surface Treatment on Plastic Deformation of Industrial-grade Zr-based Bulk Metallic Glasses |
| 投稿时间：2022-11-26 修订日期：2023-05-10 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.05.017 |
| 中文关键词: 工业级块体非晶合金 激光表面处理 塑性变形 断裂强度 剪切带 |
| 英文关键词:industrial-grade bulk metallic glass laser surface treatment plastic deformation fracture strength shear bands |
| 基金项目:国家自然科学基金(12202006，52274399) |
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| Author | Institution |
| CHENG Yangyang | China Academy of Aerospace Science and Innovation, Beijing 100176, China |
| ZHONG Yong | Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| ZHANG Xing | China Academy of Aerospace Science and Innovation, Beijing 100176, China |
| CHEN Chen | Zhengzhou University, Zhengzhou 450001, China |
| YU Long | Central South University, Changsha 410083, China |
| WANG Pengfei | China Academy of Aerospace Science and Innovation, Beijing 100176, China |
| ZHANG Tao | Beihang University, Beijing 100191, China |
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| 中文摘要: |
| 目的 针对工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金受到原材料中杂质元素和制备环境中氧元素的影响，其本征塑性变形能力较差的问题，研究激光表面处理对工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金在压缩和拉伸条件下塑性变形能力的影响。方法 采用低纯原料制备工业级母合金锭子，利用铜模铸造法在低真空环境下制备工业级非晶合金试样，采用激光法对试样进行表面处理，利用万能试验机对激光处理试样的压缩和拉伸力学性能进行测试。通过X射线衍射仪和电子探针对试样的微观组织结构进行表征，采用扫描电镜对力学测试失效后试样的形貌进行微尺度观察。结果 经激光表面处理后影响区的深度约为150 μm，在影响区内铜元素的含量有所降低，但依然为非晶结构。在压缩条件下，未经激光表面处理的工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金的塑性应变为0，断裂强度为1 534 MPa。经过激光表面处理后，试样具有1%的塑性应变，屈服强度为1 337 MPa，断裂强度为1 562 MPa。在拉伸条件下，激光表面处理前后工业级块体非晶合金的塑性应变均为0，断裂强度也无明显变化，其平均值为1 379 MPa。结论 通过激光表面处理在工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金试样表面引起的成分变化和引入的残余应力状态，能够有效促使压缩载荷作用下剪切带的萌生，提高其压缩塑性变形能力。 |
| 英文摘要: |
| Industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 bulk metallic glasses (BMGs) possess poor plastic deformation ability due to the effect of impurity elements in the raw materials and oxygen elements from the preparation processing. This paper aims to study the effect of the laser surface treatment (LSM) on the microstructure and the plasticity of industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMGs. The master alloy ingots were prepared by arc-melting with low-purity raw materials. The industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMG specimens were prepared by copper mold casting method in a low vacuum environment, and then the specimens were treated by LSM under different parameters. The compressive and tensile properties of the laser treated specimens were investigated with a universal testing machine. The microstructure of the specimens before and after the LSM was characterized with an X-ray diffractometer and an electron microprobe. The morphology of the specimens after the deformation was observed with a scanning electron microscopy (SEM). It was found that the depth of the affected zone induced by the LSM was about 150 μm. The content of copper element dropped in the affected zone compared with the nominal composition. Notably, the laser-affected zone in the near surface and the unaffected zone in the middle of the specimen still exhibited amorphous structure. Before the LSM, the compressive plasticity of the industrial grade Zr49.7Ti2Cu37.8Al10Er0.5 BMG was nearly zero, and the fracture strength was 1 534 MPa. After the LSM, the compressive plastic strain was 1% with the yielding strength 1 478 MPa and the fracture strength 1 562 MPa. The SEM observation demonstrated that there existed numerous shear bands on the laser-treated specimens while it was hard to detect shear bands on the specimens without LSM. The appearance of the shear bands further proved the plastic deformation on the laser-treated specimens. Additionally, the fracture surfaces of all the specimens possessed vein-like patterns typical of BMGs, and the angle between the fracture surface and the loading direction was less than 45°, indicating that the shear failure mode was not affected by the LSM. On the other hand, under the tensile condition, the plastic strain of the specimens before and after the LSM was zero, and there was no obvious change in the fracture strength (1 390 MPa). It was known that the LSM produced the residual stress and the change of amorphous composition. During the loading, the combination of the residual stress and the external stress induced the stress concentration and stress gradient which facilitated the formation of the shear band and prevented its propagation. The difference in amorphous composition lead to the different characteristics of shear bands and intensified the interaction of shear bands. Based on the experimental results, it is confirmed that the LSM can effectively improve the compressive plasticity of the industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMG. Nevertheless, the existence of oxygen and erbium elements are detrimental to the inherent plastic deformability of the industrial-grade Zr49.7Ti2Cu37.8Al10Er0.5 BMG. Accordingly, the compositional change and the residual stress at the present scale cannot counteract the effect of the tensile normal stress on the crack initiation. |
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