Ultrasonic-assisted plastic flow in a Zr-based metallic glass  

锆基金属玻璃超声振动下的塑性流动行为

作　　者：Chenchen Yuan Zhuwei Lv Changmeng Pang Xin Li Rui Liu Can Yang Jiang Ma Haibo Ke Weihua Wang Baolong Shen 袁晨晨;吕祝薇;庞昌蒙;李信;刘睿;杨灿;马将;柯海波;汪卫华;沈宝龙(School of Materials Science and Engineering,Jiangsu Key Laboratory for Advanced Metallic Materials,Southeast University,Nanjing,211189,China;College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,518060,China;Songshan Lake Materials Laboratory,Dongguan,523808,China;Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China)

机构地区：[1]School of Materials Science and Engineering,Jiangsu Key Laboratory for Advanced Metallic Materials,Southeast University,Nanjing,211189,China [2]College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,518060,China [3]Songshan Lake Materials Laboratory,Dongguan,523808,China [4]Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Science China Materials》2021年第2期448-459,共12页中国科学（材料科学（英文版）

基　　金：the National Natural Science Foundation of China(51631003,51871157 and 51601038);the Key Basic and Applied Research Program of Guangdong Province,China(2019B030302010);the Natural Science Foundation of Jiangsu Province,China(BK20171354);the Fundamental Research Funds for the Central Universities(2242020K40002);the Research and Practice Innovation Program for Postgraduates in Jiangsu Province(SJCX20_0038);Jiangsu Key Laboratory for Advanced Metallic Materials(BM2007204)。

摘　　要：Ultrasonic vibration can be used for the micro-molding of metallic glasses(MGs)due to stress-softening and fast surface-diffusion effects.However,the structural rearrangement under ultrasonic vibration and its impact on the mechanical response of metallic glasses remain a puzzle.In this work,the plastic flow of the Zr35Ti30Cu8.25Be26.75 metallic glass with the applied ultrasonic-vibration energy of 140 J was investigated by nanoindentation.Both Kelvin and Maxwell-Voigt models have been adopted to analyze the structural evolution during the creep deformation.The increase of the characteristic relaxation time and the peak intensity of relaxation spectra can be found in the sample after ultrasonic vibration.It effectively improves the activation energy of atomic diffusion during the glass transition(Eg)and the growth of the crystal nucleus(Ep).A more homogenous plastic deformation with a weak loading-rate sensitivity of stress exponent is observed in the ultrasonic-vibrated sample,which coincides with the low pile-up and penetration depth as shown in the cross profile of indents.The structural rearrangement under resonance actuation demonstrated in this work might help us better understand the defect-activation mechanism for the plastic flow of amorphous systems.由于应力软化和表面快速扩散效应,超声振动可以用于金属玻璃微成型.然而,超声振动下的结构重排及其对金属玻璃力学响应机制的影响仍不清楚.本工作采用纳米压痕方法研究了超声振动能量为140 J的Zr(35)Ti(30)Cu(8.25)Be(26.75)金属玻璃的塑性流动行为.我们采用Kelvin和Maxwell-Voigt模型分析了蠕变过程中的结构演化.研究发现,高频超声振动后样品的特征弛豫时间增长且弛豫峰增强.它有效地提高了玻璃转变和晶核生长过程中原子扩散的激活能.我们在超声振动样品中观察到较均匀的塑性变形行为,还发现超声振动之后加载速率对金属玻璃应力指数的敏感性减弱的现象.本文有关共振驱动下的结构重排现象的研究有助于更好地理解非晶态系统塑性流动行为的缺陷激活机制.

关 键 词：plastic deformation disordered structure activation energy metallic glass 

分 类 号：TG139.8[一般工业技术—材料科学与工程]