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深冷循环热处理下锆基金属玻璃的回春行为调控

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研究Zr55Cu30Ni5Al10(摩尔分数,％)金属玻璃在深冷循环处理过程中的回春行为.实验发现,随着循环次数的增加,样品的回春程度更高,表现为更高的弛豫焓与更低的密度.回春程度经200次循环后逐渐饱和,这可能与非晶结构中有限的自由体积含量有关.同时,高循环次数下的样品硬度更低,塑性更好,这与其剪切转变区体积增大有关.此时,更低的剪切面形成能有利于多重剪切带的形成.此外,还发现自由体积含量与样品塑性应变及剪切转变区体积呈线性关系.分子动力学模拟结果还表明,在高冷速下回春程度高的样品会发生原子体积的饱和.
Tailoring rejuvenation behavior of Zr-based metallic glass upon deep cryogenic cycling treatment
The rejuvenation behavior of a Zr55Cu30Ni5Al10(at.％)metallic glass upon deep cryogenic cycling treatment was investigated.The sample was rejuvenated to a larger extent with increasing cyclic number,resulting in a higher enthalpy of relaxation and a lower density.The rejuvenation seems to be saturated after 200 cycles,which may originate from the limited content of free volume in the amorphous structure.The sample subjected to a higher cyclic number showed a lower hardness and better plasticity due to a larger shear transformation zone(STZ)volume.In this case,a lower shear plane formation energy facilitates the generation of multiple shear bands.Furthermore,it is found that the content of free volume has linear relationship with the plastic strain and the STZ volume.The results from molecular dynamics simulation also demonstrates that the atomic volume saturates with a higher degree of rejuvenation at a higher cooling rate of the simulated sample.

metallic glassrejuvenationcryogenic cycling treatmentcyclic numberplasticity

郭威、余圣、丁俊、吕书林、吴树森、赵觅

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华中科技大学材料科学与工程学院,材料成形与模具技术全国重点实验室,武汉 430074

深圳华中科技大学研究院,深圳 518057

西安交通大学金属材料强度国家重点实验室材料创新设计中心,西安 710049

华中科技大学航空航天学院,武汉 430074

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金属玻璃 回春 深冷循环热处理 循环次数 塑性

National Natural Science Foundation of China,ChinaNatural Science Foundation of Hubei Province,ChinaShenzhen Science and Technology Program,ChinaState Key Lab of Advanced Metals and Materials,ChinaState Key Laboratory for Mechanical Behavior of Materials,ChinaGuangdong Basic and Applied Basic Research Foundation,ChinaGuangdong Basic and Applied Basic Research Foundation,ChinaState Key Laboratory of Materials Processing and Die & Mold Technology,Huazhong University of Science and Technology,ChinaNational Natural Science Foundation of ChinaNational Youth Talents ProgramCenter for Alloy Innovation and Design(CAID)HPC platform of Xi'an Jiaotong University

521011382020CFB259JCYJ202205301608130322020-Z01202022052020A15151105312021A1515111122P2021-02112004294

2024

10.1016/S1003-6326(23)66419-2

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(2)