激光表面处理对工业级锆基块体非晶合金弯曲变形和缺口韧性的影响  

Effect of Laser Surface Treatment on Bending Deformation and Notch Toughness of Industrial-grade Zr-based Bulk Metallic Glasses

作　　者：程杨洋 钟勇[2] 贾怡[1] 王鹏飞 陈辰[3] 张涛[4] CHENG Yang-yang;ZHONG Yong;JIA Yi;WANG Peng-fei;CHEN Chen;ZHANG Tao(China Academy of Aerospace Science and Innovation,Beijing 100176,China;Southwest Institute of Technology and Engineering,Chongqing 400039,China;Zhengzhou University,Zhengzhou 450001,China;Beihang University,Beijing 100191,China)

机构地区：[1]中国航天科技创新研究院,北京100176 [2]西南技术工程研究所,重庆400039 [3]郑州大学,郑州450001 [4]北京航空航天大学,北京100191

出　　处：《装备环境工程》2023年第5期80-89,共10页Equipment Environmental Engineering

基　　金：国家自然科学基金(12202006,52274399)。

摘　　要：目的 改善块体非晶合金的弯曲力学性能,同时考虑航空结构材料选材的经济性,研究激光表面处理工艺对工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金弯曲变形和缺口韧性的影响规律。方法 采用低纯原料和低真空制备条件获得工业级Zr49.7Ti2Cu37.8Al10Er0.5块体非晶合金试样,考虑到弯曲条件下试样受到拉伸和压缩2种正应力状态,研究不同处理工艺和激光处理表面对试样弯曲变形和缺口韧性的影响。结果 当激光处理表面位于弯曲试样的2个侧表面时,其对试样的塑性变形能力和断裂强度没有明显的影响,但会显著降低试样的缺口韧性,从(56.4±3.4)MPa·m1/2降低到(26.2±4.8)MPa·m1/2;激光处理表面位于弯曲试样的受拉侧时,试样的弯曲断裂强度从2 150 MPa降低到1 800 MPa;当激光处理表面位于弯曲试样的受压侧时,试样的弯曲断裂强度从2 150 MPa提高到2 550 MPa,但对其缺口韧性无明显的影响。结论 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对其弯曲力学行为和缺口韧性的影响,与试样的受力情况紧密相关。残余应力与外载应力的正向耦合能够放大外载应力的作用效果,表面和心部的成分差异也有可能作为应力集中点出现,导致裂纹源的形成,降低试样的断裂强度。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 de-formation and toughness of industrial-grade Zr_(49.7)Ti_(2)Cu_(37.8)Al_(10)Er_(0.5) BMGs.Industrial-grade Zr_(49.7)Ti_(2)Cu_(37.8)Al_(10)Er_(0.5) BMGs were obtained through low purity raw materials and low vacuum preparation conditions.Considering that the specimens were sub-jected to both tensile and compressive normal stress states under the bending condition,the effects of different treatment proc-esses and different laser treated surfaces on the bending deformation and toughness of the specimens were studied.When the la-ser-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·m^(1/2) to(26.2±4.8)MPa·m^(1/2).When the laser-treated surface was located on the tensile side of the bending specimen,the bending fracture strength of the specimen decreased from 2150 MPa to 1800 MPa.When the laser-treated sur-face was located on the compressive side of the bending specimen,the bending fracture strength of the specimen increased from 2150 MPa to 2550 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 Zr_(49.7)Ti_(2)Cu_(37.8)Al_(10)Er_(0.5) 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 spec

关 键 词：工业级块体非晶合金 激光表面处理 弯曲变形 断裂强度 缺口韧性 轻质高强材料 

分 类 号：TG139[一般工业技术—材料科学与工程]