空位缺陷
成核
材料科学
降水
氢化物
化学物理
星团(航天器)
结晶学
溶解
锆
相(物质)
相变
化学工程
物理化学
凝聚态物理
热力学
化学
冶金
金属
物理
有机化学
程序设计语言
气象学
计算机科学
工程类
作者
Si-Mian Liu,Shi-Hao Zhang,Shigenobu Ogata,Huilong Yang,Shinzo Kano,Hiroaki Abe,Wei-Zhong Han
出处
期刊:Small
[Wiley]
日期:2023-08-30
标识
DOI:10.1002/smll.202300319
摘要
Controlling the heterogeneous nucleation of new phases is of importance in tuning the microstructures and properties of materials. However, the role of vacancy-a popular defect in materials that is hard to be resolved under conventional electron microscopy-in the heterogeneous phase nucleation remains intriguing. Here, this work captures direct in situ experimental evidences that vacancy clusters promote the heterogeneous hydride nucleation and cause the anomalous precipitation memory effect in zirconium. Both interstitial and vacancy dislocation loops form after hydride dissolution. Interestingly, hydride reprecipitation only occurs on those vacancy loop decorated sites during cooling. Atomistic simulations reveal that hydrogen atoms are preferentially segregated at individual vacancy and vacancy clusters, which assist hydride nucleation, and stimulate the unusual memory effect during hydride reprecipitation. The finding breaks the traditional view on the sequence of heterogeneous nucleation sites and sheds light on the solid phase transformation related to vacancy-sensitive alloying elements.
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