期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Dynamic strength behavior of a Zr-based bulk metallic glass under shock loading
1
作者 俞宇颖 习锋 +5 位作者 戴诚达 蔡灵仓 谭叶 李雪梅 吴强 谭华 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第6期461-465,共5页
Dynamic strength behavior of Zr51Ti5NiloCu25A19 bulk metallic glass (BMG) up to 66 GPa was investigated in a series of plate impact shock-release and shock-reload experiments. Particle velocity profiles measured at ... Dynamic strength behavior of Zr51Ti5NiloCu25A19 bulk metallic glass (BMG) up to 66 GPa was investigated in a series of plate impact shock-release and shock-reload experiments. Particle velocity profiles measured at the sample/LiF window interface were used to estimate the shear stress, shear modulus, and yield stress in shocked BMG. Beyond confirm- ing the previously reported strain-softening of shear stress during the shock loading process for BMGs, it is also shown that the softened Zr-BMG still has a high shear modulus and can support large yield stress when released or reloaded from the shocked state, and both the shear modulus and the yield stress appear as strain-hardening behaviors. The work provides a much clearer picture of the strength behavior of BMGs under shock loading, which is useful to comprehensively understand the plastic deformation mechanisms of BMGs. 展开更多
关键词 shock loading dynamic strength bulk metallic glass
原文传递
Effects of aspect ratio and loading rate on room-temperature mechanical properties of Cu-based bulk metallic glasses 被引量:1
2
作者 蔡安辉 刘咏 +6 位作者 吴宏 丁大伟 安伟科 周果君 罗云 彭勇宜 李小松 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2617-2632,共16页
Room-temperature mechanical properties of Cu50Zr40Ti10-xNix(0≤x≤4,mole fraction,%) bulk metallic glasses (BMG) with aspect ratios in the range of 1:1-2.5:1 and loading rates in the range of1×10^-5-1×... Room-temperature mechanical properties of Cu50Zr40Ti10-xNix(0≤x≤4,mole fraction,%) bulk metallic glasses (BMG) with aspect ratios in the range of 1:1-2.5:1 and loading rates in the range of1×10^-5-1×10^-2s^-1were systematically investigated by room-temperatureuniaxialcompression test.In the condition of an aspect ratio of 1:1, the superplasticity can be clearly observed for Cu50Zr40Ti10BMG when the loading rate is1×10^-4s^-1, while for Cu50Zr40Ti10-xNix(x=1-3, mole fraction, %) BMGs when the loading rate is1×10^-2s^-1. The plastic strain (εp), yielding strength (σy) and fracture strength (σf) of the studied Cu-based BMGs significantly depend on the aspect ratio and the loading rate. In addition, theσyof the studied Cu-based BMGs with an aspect ratio of 1:1 is close to the σfof those with the other aspect ratios when the loading rate is1×10^-2s^-1. The mechanism for the mechanical response to the loading rate and the aspect ratiowas also discussed. 展开更多
关键词 Cu-based bulk metallic glasses aspect ratio loading rate PLASTICITY strength
下载PDF
Dynamic response and damage evolution of Zr-based bulk metallic glass under shock loading
3
作者 Yan Li Xingwang Cheng +2 位作者 Zhaolong Ma Xuhai Li Meng Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第34期119-127,共9页
Dynamic response and damage evolution of Zr_(70)Cu_(13)Ni_(9.8)Al_(3.6)Nb_(3.4)Y_(0.2) bulk metallic glass(Zr-based BMG)under impact pressure ranging from 4.03 GPa to 27.22 GPa were studied.The Hugoniot Elastic Limit(... Dynamic response and damage evolution of Zr_(70)Cu_(13)Ni_(9.8)Al_(3.6)Nb_(3.4)Y_(0.2) bulk metallic glass(Zr-based BMG)under impact pressure ranging from 4.03 GPa to 27.22 GPa were studied.The Hugoniot Elastic Limit(HEL)and the spalling Strength(σ_(sp))were measured as 7.09 GPa and 2.28 GPa,and the curve of impact velocity(D)and particle velocity(u)were also obtained.Under the strain rate of~10^(5)s^(-1),local crystallization phenomenon was observed.As increasing the impact pressure,the failure mode of Zr-based BMG changed from spallation to fragmentation caused by the combination of spalling cracks and longitudinal cracks.Cone-cup structures were also observed in the internal spalling zone via nano-CT characterization.When increasing the impact pressure,the thickness of Zr-based BMG increased after impact and the remelting and cladding layers were also observed on the fracture surfaces.The fragments of the specimen were welded after impact due to the high temperature remelting,which causes plastic deformation of Zr-based BMG under shock loading. 展开更多
关键词 Zr-based bulk metallic glass shock loading dynamic response Damage evolution
原文传递
Dynamic Compressive Deformation and Fracture of a Hollow Bulk Metallic Glass
4
作者 Haiyan Ye Tao Zhang +4 位作者 Zhihua Wang Hefeng Zhou Shengbo Sang Huijun Yang Junwei Qiao 《Open Journal of Metal》 2013年第3期50-55,共6页
The dynamic mechanical behaviors of hollow Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metal glass (BMG) are investigated using a splitting Hopkinson pressure bar (SHPB) in this study. Upon dynamic compressive loading, the ho... The dynamic mechanical behaviors of hollow Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metal glass (BMG) are investigated using a splitting Hopkinson pressure bar (SHPB) in this study. Upon dynamic compressive loading, the hollow specimen exhibit lower strength and poor ductility, caused by the higher stress concentration for the hollow one through FEM modeling. The different strain-rate responses for the hollow specimen are compared and explained. On the fracture surface of the hollow samples, there are highly dense vein patterns, many liquid drops and fishbone-like patterns. 展开更多
关键词 bulk metallic glassES Deformation and Fracture dynamic COMPRESSIVE loading
下载PDF
动高压加载下锆基金属玻璃强度测量 被引量:1
5
作者 俞宇颖 习锋 +3 位作者 戴诚达 蔡灵仓 谭华 李雪梅 《爆炸与冲击》 EI CAS CSCD 北大核心 2014年第1期1-5,共5页
为了研究Zr51 Ti5 Ni10Cu25Al9 金属玻璃的高压强度特性,进行了平靶冲击实验。采用反向碰撞方式,运用DISAR技术测量金属玻璃样品/LiF窗口界面粒子速度剖面,分析粒子速度剖面获得了37~66GPa压力范围锆基金属玻璃的屈服强度和剪切模... 为了研究Zr51 Ti5 Ni10Cu25Al9 金属玻璃的高压强度特性,进行了平靶冲击实验。采用反向碰撞方式,运用DISAR技术测量金属玻璃样品/LiF窗口界面粒子速度剖面,分析粒子速度剖面获得了37~66GPa压力范围锆基金属玻璃的屈服强度和剪切模量。实验结果表明,在上述压力范围金属玻璃的屈服强度和剪切模量均显示出一定程度的压力硬化效应,分析表明金属玻璃冲击加载波阵面剪应力衰减并非由损伤/破坏或温度软化等因素导致。 展开更多
关键词 固体力学 屈服强度 DISAR 金属玻璃 剪切模量 冲击波
下载PDF
In-situ Dendrite/Metallic Glass Matrix Composites:A Review 被引量:5
6
作者 Junwei Qiao 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2013年第8期685-701,共17页
The advanced fabrication of in-situ dendrite/metallic glass matrix (MGM) composites is reviewed. Herein, the semi- solid processing and Bridgman solidification are two methods, which can make the dendrites homogeneo... The advanced fabrication of in-situ dendrite/metallic glass matrix (MGM) composites is reviewed. Herein, the semi- solid processing and Bridgman solidification are two methods, which can make the dendrites homogeneously dispersed within the metallic glass matrix. Upon quasi-static compressive loading at room temperature, almost all the in-situ composites exhibit improved plasticity, due to the effective block to the fast propagation of shear bands. Upon quasi-static tensile loading at room temperature, although the composites possess tensile ductility, the inhomogeneous deformation and associated softening dominates. High volume-fractioned dendrites and network structures make in-situ composites distinguishingly plastic upon dynamic compression. In-situ composite exhibits high tensile strength and softening (necking) in the supercooled liquid region, since the presence of high volume-fractioned dendrites lowers the rheology of the viscous glass matrix at high temperatures. At cryogenic temperatures, a distinguishingly-increased maximum strength is available; however, a ductile-to-brittle transition seems to be present by lowering the temperature. Besides, improved tension-tension fatigue limit of 473 MPa and four-point-bending fatigue limit of 567 MPa are gained for Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 MGM composites. High volume-fraction dendrites within the glass matrix induce increased effectiveness on the blunting and propagating resistance of the fatigue-crack tip. The fracture toughness of in-situ composites is comparable to those of the toughest steels and crystalline Ti alloys. During steady-state crack-growth, the confinement of damage by in-situ dendrites results in enhancement of the toughness. 展开更多
关键词 bulk metallic glasses Composites Mechanical properties dynamic loading MICROSTRUCTURES Shear bands
原文传递
冲击加载下Zr_(51)Ti_5Ni_(10)Cu_(25)Al_9金属玻璃的塑性行为 被引量:3
7
作者 俞宇颖 习锋 +4 位作者 戴诚达 蔡灵仓 谭华 李雪梅 胡昌明 《物理学报》 SCIE EI CAS CSCD 北大核心 2012年第19期382-387,共6页
进行了10一27 GPa应力范围内Zr_(51)Ti_5 Ni_(10)Cu_(25)Al_9金属玻璃的平面冲击实验以研究其高压-高应变率加载下的塑性行为.由样品自由面粒子速度剖面的分析获得了冲击加载过程的轴向应力,并通过轴向应力与静水压线的比较获得剪应力.... 进行了10一27 GPa应力范围内Zr_(51)Ti_5 Ni_(10)Cu_(25)Al_9金属玻璃的平面冲击实验以研究其高压-高应变率加载下的塑性行为.由样品自由面粒子速度剖面的分析获得了冲击加载过程的轴向应力,并通过轴向应力与静水压线的比较获得剪应力.实验结果表明,尽管存在明显的松弛效应,但Zr基金属玻璃的Hugoniot弹性极限随着冲击应力的增加而增加.然而,塑性波阵面上的剪应力则显示先硬化而后软化现象,而且软化的幅度随冲击应力的增加而增加.冲击加载下Zr基金属玻璃的上述剪应力变化特征与分子动力学模拟结果比较一致,但与压剪实验结果和一维应力冲击实验结果明显不同. 展开更多
关键词 塑性行为 冲击加载 金属玻璃 剪应力
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部