In general,the rapid growth of α-Fe clusters is a challenge in high Fe-content Fe-based amorphous alloys,negatively affecting their physical properties.Herein,we introduce an efficient and rapid post-treatment techni...In general,the rapid growth of α-Fe clusters is a challenge in high Fe-content Fe-based amorphous alloys,negatively affecting their physical properties.Herein,we introduce an efficient and rapid post-treatment technique known as ultrasonic vibration rapid processing(UVRP),which enables the formation of high-density strong magnetic α-Fe clusters,thereby enhancing the soft magnetic properties of Fe_(78)Si(13)B_(9) amorphous alloy ribbon.展开更多
To advance materials with superior performance,the construction of gradient structures has emerged as a promising strategy.In this study,a gradient nanocrystalline-amorphous structure was induced in Zr46Cu46Al8 bulk m...To advance materials with superior performance,the construction of gradient structures has emerged as a promising strategy.In this study,a gradient nanocrystalline-amorphous structure was induced in Zr46Cu46Al8 bulk metallic glass(BMG)through ultrasonic vibration(UV)treatment.Applying a 20 kHz ultrasonic cyclic loading in the elastic regime,controllable gradient structures with varying crystallized volume fractions can be achieved in less than 2 s by adjusting the input UV energy.In contrast to tradi-tional methods of inducing structural gradients in BMGs,this novel approach offers distinct advantages:it is exceptionally rapid,requires minimal stress,and allows for easy tuning of the extent of structural gradients through precise adjustment of processing parameters.Nanoindentation tests reveal higher hard-ness near the struck surface,attributed to a greater degree of nanocrystal formation,which gradually di-minishes with depth.As a result of the gradient dispersion of nanocrystals,an increased plasticity was found after UV treatment,characterized by the formation of multiple shear bands.Microstructural in-vestigations suggest that UV-induced nanocrystallization originates from local atomic rearrangements in phase-separated Cu-rich regions with high diffusional mobility.Our study underscores the tunability of structural gradients and corresponding performance improvements in BMGs through ultrasonic energy modulation,offering valuable insights for designing advanced metallic materials with tailored mechanical properties.展开更多
The amorphization of alloys is of both broad scientific interests and engineering significance.Despite considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,...The amorphization of alloys is of both broad scientific interests and engineering significance.Despite considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,a facile and rapid method to trigger solid-state amorphization is still being pursued.Here we report such a method to utilize ultrasonic vibration to trigger amorphization of intermetallic compound.The ultrasonic vibrations can cause tunable amorphization at room temperature and low stress(2 MPa)conveniently.Remarkably,the ultrasonic-induced amorphization could be achieved in 60 s,which is 360 times faster than the ball milling(2.16×10^(4) s)with the similar proportion of amorphization.The elements redistribute uniformly and rapidly via the activated short-circuit diffusion.Both experimental evidences and simulations show that the amorphous phase initiates and expands at nanograin boundaries,owing to the induction of lattice instability.This work provides a groundbreaking strategy for developing novel materials with tunable structures and properties.展开更多
Metallic glasses (MGs) have been found to exhibit unexpected ultrasonic-vibration-induced plasticity (UVIP),which provides a promising way to realize room temperature processing and molding of MGs.However,whether all ...Metallic glasses (MGs) have been found to exhibit unexpected ultrasonic-vibration-induced plasticity (UVIP),which provides a promising way to realize room temperature processing and molding of MGs.However,whether all MGs possessing UVIP remains a mystery.展开更多
Fe-based metallic glasses（MGs） with excellent soft magnetic properties are applicable in a wide range of electronic industry. We show that the cryogenic thermal cycle has a sensitive effect on soft magnetic properti...Fe-based metallic glasses（MGs） with excellent soft magnetic properties are applicable in a wide range of electronic industry. We show that the cryogenic thermal cycle has a sensitive effect on soft magnetic properties of Fe78Si9B13 glassy ribbon. The values of magnetic induction（or magnetic flux density） B and Hc coercivity c show fluctuation with increasing number of thermal cycles. This phenomenon is explained as thermal-cycle-induced stochastically structural aging or rejuvenation which randomly fluctuates magnetic anisotropy and, consequently, the magnetic induction and coercivity. Overall,increasing the number of thermal cycles improves the soft magnetic properties of the ribbon. The results could help understand the relationship between relaxation and magnetic property, and the thermal cycle could provide an effective approach to improving performances of metallic glasses in industry.展开更多
Metallic glasses(MGs)possess exceptional properties,but their properties consistently deteriorate over time,thereby resulting in increased complexity in processing.It thus poses a formidable challenge to the forming o...Metallic glasses(MGs)possess exceptional properties,but their properties consistently deteriorate over time,thereby resulting in increased complexity in processing.It thus poses a formidable challenge to the forming of long-term aged MGs.Here,we report ultrasonic vibration(UV)loading can lead to large plas-ticity and strong rejuvenation in significantly aged MGs within 1 s.A large UV-induced plasticity(UVIP)of 80%height reduction can be achieved in LaNiAl MG samples aged at 85%of its glass transition tem-perature(0.85 T_(g))for a duration of up to 1 month.The energy threshold required for UVIP monotonously increases with aging time.After the UV loading process,the aged samples show strong rejuvenation,with the relaxation enthalpy even surpassing that of as-cast samples.These findings suggest that UV loading is an effective technique for forming and rejuvenating aged MGs simultaneously,providing an alterna-tive avenue to explore the interplay between the property and microstructures as well as expanding the application prospects of MGs.展开更多
The aging of glassy materials is an inevitable process leading to progressive property degradation.In metallic glasses(MGs),aging-induced property degradation poses a persistent challenge to their applications.Over th...The aging of glassy materials is an inevitable process leading to progressive property degradation.In metallic glasses(MGs),aging-induced property degradation poses a persistent challenge to their applications.Over the years,rejuvenating or even reversing the aged glasses remains a critical elusive goal.Here we report that ultrasonic vibration(UV)treatment can reverse aging in a Zr-based MG within 0.5 s,achieving plasticity up to 14.5%that is 1.5 times that of the as-cast MG.This intriguing plasticity enhancement results from a UV-induced higher-energy state,as evidenced by structural enthalpy recovery,boson peak restoration,and a more disordered structure revealed by the pair distribution functions.This higher-energy state can be properly explained through the framework of‘anti-free volume defects’with a high atomic packing density.Furthermore,we propose a novel‘aging-assisted UV loading’method:pre-aging stabilizes the MG,enabling subsequent UV to amplify plasticity.This strategy achieves exceptional plasticity improvement,demonstrating that controlled aging can paradoxically enhance material properties.展开更多
Advancements in forming technology offer significant advantages for the manufacturing industry,including enhanced efficiency,energy conservation,and improved material utilization[1].However,traditional additive manufa...Advancements in forming technology offer significant advantages for the manufacturing industry,including enhanced efficiency,energy conservation,and improved material utilization[1].However,traditional additive manufacturing[2],thermoplastic forming[3],and laser cutting[4]encounter challenges when applied in under-liquid environments,mainly due to difficulties in temperature control and heat source provision.展开更多
基金supported by the Major Science and Technology Project of Zhongshan City(No.2022AJ004)the Key Basic and Applied Research Program of Guangdong Province(Nos.2019B030302010 and 2022B1515120082)Guangdong Science and Technology Innovation Project(No.2021TX06C111).
文摘In general,the rapid growth of α-Fe clusters is a challenge in high Fe-content Fe-based amorphous alloys,negatively affecting their physical properties.Herein,we introduce an efficient and rapid post-treatment technique known as ultrasonic vibration rapid processing(UVRP),which enables the formation of high-density strong magnetic α-Fe clusters,thereby enhancing the soft magnetic properties of Fe_(78)Si(13)B_(9) amorphous alloy ribbon.
基金supported by the Key Basic and Applied Research Program of Guangdong Province,China(Grant No.2019B030302010)the NSF of China(Grant Nos.52122105,52271150,52201185,52201186,52371160)+1 种基金the Science and Technology Innovation Commission Shenzhen(Grants Nos.RCJC20221008092730037,20220804091920001)the Research Team Cultivation Program of Shenzhen University,Grant No.2023QNT001.
文摘To advance materials with superior performance,the construction of gradient structures has emerged as a promising strategy.In this study,a gradient nanocrystalline-amorphous structure was induced in Zr46Cu46Al8 bulk metallic glass(BMG)through ultrasonic vibration(UV)treatment.Applying a 20 kHz ultrasonic cyclic loading in the elastic regime,controllable gradient structures with varying crystallized volume fractions can be achieved in less than 2 s by adjusting the input UV energy.In contrast to tradi-tional methods of inducing structural gradients in BMGs,this novel approach offers distinct advantages:it is exceptionally rapid,requires minimal stress,and allows for easy tuning of the extent of structural gradients through precise adjustment of processing parameters.Nanoindentation tests reveal higher hard-ness near the struck surface,attributed to a greater degree of nanocrystal formation,which gradually di-minishes with depth.As a result of the gradient dispersion of nanocrystals,an increased plasticity was found after UV treatment,characterized by the formation of multiple shear bands.Microstructural in-vestigations suggest that UV-induced nanocrystallization originates from local atomic rearrangements in phase-separated Cu-rich regions with high diffusional mobility.Our study underscores the tunability of structural gradients and corresponding performance improvements in BMGs through ultrasonic energy modulation,offering valuable insights for designing advanced metallic materials with tailored mechanical properties.
基金financially supported by the Key Basic and Applied Research Program of Guangdong Province,China(No.2019B030302010)the National Natural Science Foundation of China(Nos.52122105,51971150,51871157)+3 种基金the National Key Research and Development Program of China(No.2018YFA0703605)the financial support from the National Natural Science Foundation of China(No.12072344)the Youth Innovation Promotion Association of the Chinese Academy of Sciencessupported by the Beijing Electron Positron Collider(BEPC)project(No.2020-BEPC-PT-004661).
文摘The amorphization of alloys is of both broad scientific interests and engineering significance.Despite considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,a facile and rapid method to trigger solid-state amorphization is still being pursued.Here we report such a method to utilize ultrasonic vibration to trigger amorphization of intermetallic compound.The ultrasonic vibrations can cause tunable amorphization at room temperature and low stress(2 MPa)conveniently.Remarkably,the ultrasonic-induced amorphization could be achieved in 60 s,which is 360 times faster than the ball milling(2.16×10^(4) s)with the similar proportion of amorphization.The elements redistribute uniformly and rapidly via the activated short-circuit diffusion.Both experimental evidences and simulations show that the amorphous phase initiates and expands at nanograin boundaries,owing to the induction of lattice instability.This work provides a groundbreaking strategy for developing novel materials with tunable structures and properties.
基金financially supported by the Key Basic and Applied Research Program of Guangdong Province, China (No.2019B030302010)the National Natural Science Foundation of China (Nos.52371160,51901243,52122105 and 51971150)the National Key Research and Development Program of China (No.2018YFA0703604)。
文摘Metallic glasses (MGs) have been found to exhibit unexpected ultrasonic-vibration-induced plasticity (UVIP),which provides a promising way to realize room temperature processing and molding of MGs.However,whether all MGs possessing UVIP remains a mystery.
基金supported by the National Key Research and Development Plan,China(Grant No.2016YFB0300501)the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(Grant No.QYZDY-SSW-JSC017)+1 种基金the National Natural Science Foundation of China(Grant Nos.51571209,51461165101,and 51301194)the National Basic Research Program of China(Grant No.2015CB856800)
文摘Fe-based metallic glasses（MGs） with excellent soft magnetic properties are applicable in a wide range of electronic industry. We show that the cryogenic thermal cycle has a sensitive effect on soft magnetic properties of Fe78Si9B13 glassy ribbon. The values of magnetic induction（or magnetic flux density） B and Hc coercivity c show fluctuation with increasing number of thermal cycles. This phenomenon is explained as thermal-cycle-induced stochastically structural aging or rejuvenation which randomly fluctuates magnetic anisotropy and, consequently, the magnetic induction and coercivity. Overall,increasing the number of thermal cycles improves the soft magnetic properties of the ribbon. The results could help understand the relationship between relaxation and magnetic property, and the thermal cycle could provide an effective approach to improving performances of metallic glasses in industry.
基金supported by the Key Basic and Applied Research Program of Guangdong Province,China(Grant No.2019B030302010)the NSF of China(Grant Nos.52122105,51971150,51901243)+1 种基金the Science and Technology Innovation Commission Shenzhen(Grants No.RCJC20221008092730037 and 20220804091920001)the National Key Research and Development Program of China(Grant No.2018YFA0703605).
文摘Metallic glasses(MGs)possess exceptional properties,but their properties consistently deteriorate over time,thereby resulting in increased complexity in processing.It thus poses a formidable challenge to the forming of long-term aged MGs.Here,we report ultrasonic vibration(UV)loading can lead to large plas-ticity and strong rejuvenation in significantly aged MGs within 1 s.A large UV-induced plasticity(UVIP)of 80%height reduction can be achieved in LaNiAl MG samples aged at 85%of its glass transition tem-perature(0.85 T_(g))for a duration of up to 1 month.The energy threshold required for UVIP monotonously increases with aging time.After the UV loading process,the aged samples show strong rejuvenation,with the relaxation enthalpy even surpassing that of as-cast samples.These findings suggest that UV loading is an effective technique for forming and rejuvenating aged MGs simultaneously,providing an alterna-tive avenue to explore the interplay between the property and microstructures as well as expanding the application prospects of MGs.
基金supported by the NSF of China(Grant Nos.52371160,52401217,52271150,52201185)the Key-Area Research and Development Program of Guangdong Province(Grant No.2024B0101070001)+4 种基金the Applied Research Program of Guangdong Province(Grant No.2019B030302010)the Science and Technology Innovation Commission Shenzhen(Grants Nos.RCJC20221008092730037 and 20220804091920001)the Research Team Cultivation Program of Shenzhen University(Grant No.2023QNT001)Shenzhen Science and Technology Program(JCYJ20240813141413018)Scientific Foundation for Youth Scholars of Shenzhen University.
文摘The aging of glassy materials is an inevitable process leading to progressive property degradation.In metallic glasses(MGs),aging-induced property degradation poses a persistent challenge to their applications.Over the years,rejuvenating or even reversing the aged glasses remains a critical elusive goal.Here we report that ultrasonic vibration(UV)treatment can reverse aging in a Zr-based MG within 0.5 s,achieving plasticity up to 14.5%that is 1.5 times that of the as-cast MG.This intriguing plasticity enhancement results from a UV-induced higher-energy state,as evidenced by structural enthalpy recovery,boson peak restoration,and a more disordered structure revealed by the pair distribution functions.This higher-energy state can be properly explained through the framework of‘anti-free volume defects’with a high atomic packing density.Furthermore,we propose a novel‘aging-assisted UV loading’method:pre-aging stabilizes the MG,enabling subsequent UV to amplify plasticity.This strategy achieves exceptional plasticity improvement,demonstrating that controlled aging can paradoxically enhance material properties.
基金supported by the Key Basic and Applied Research Program of Guangdong Province,China(2019B030302010)the National Natural Science Foundation of China(52122105,51971150)+2 种基金the Shenzhen Fundamental Research Program(JCYJ20210324121011031)the Science and Technology Innovation Commission Shenzhen(RCJC20221008092730037 and 20220804091920001)the National Key Research and Development Program of China(2018YFA0703605).
文摘Advancements in forming technology offer significant advantages for the manufacturing industry,including enhanced efficiency,energy conservation,and improved material utilization[1].However,traditional additive manufacturing[2],thermoplastic forming[3],and laser cutting[4]encounter challenges when applied in under-liquid environments,mainly due to difficulties in temperature control and heat source provision.
