Generalization of the Hall-Petch and inverse Hall-Petch behaviors by tuning amorphous regions in 2D solids  

在线阅读下载全文

作  者:Zhibin Xu Mengmeng Li Huijun Zhang Yilong Han 

机构地区:[1]Department of Physics,The Hong Kong University of Science and Technology,Hong Kong 999077,China [2]Function Hub,The Hong Kong University of Science and Technology(Guangzhou),Guangzhou 510000,China [3]Department of Mechanical&Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong 999077,China [4]State Key Laboratory for Mechanical Behavior of Materials,Shaanxi International Research Center for Soft Matter,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China [5]The Hong Kong University of Science and Technology Shenzhen Research Institute,Shenzhen 518057,China

出  处:《National Science Open》2023年第3期83-94,共12页国家科学进展(英文)

基  金:supported by the Guangdong Basic and Applied Basic Research Foundation(2020B1515120067);the Hong Kong Research Grants Council under the Collaborative Research Fund(CRF-C6016-20G and CRF-C6021-19EF);the Fundamental Research Funds for the Central Universities(xxj032021001);the Key R&D Project of Shaanxi Province(2022GY-400);the National Natural Science Foundation of China(12274336).

摘  要:The strengthσ_(y)(D)of a polycrystal can decrease or increase with the grain diameter D,i.e.,the famous Hall-Petch(HP)and inverse-Hall-Petch(IHP)behaviors,respectively.However,σ_(y)(D)under thick grain boundaries(GBs)(i.e.,GB thickness l>1 particle)andσ_(y)(l)have rarely been explored.Here we measure them by systematically varying D and l of two-dimensional glass-crystal composites in simulations.We demonstrate that increasing l and decreasing D have similar effects on reducing dislocation motions and promoting GB deformations.Consequently,the classical HP-IHP behaviors ofσ_(y)(D,l=1)and our generalized HP-IHP behaviors ofσ_(y)(D,l)share similar mechanisms and can be unified asσ_(y)(AGB/Atot),where AGB/Atot is the fraction of the amorphous region.The results reveal a way to exceed the maximum strength of normal polycrystals.The generalized HP-IHP behaviors ofσ_(y)(D,l)should be similar in 2D and 3D,except that the HP effect in 3D is stronger.

关 键 词:POLYCRYSTAL amorphous solid crystal-glass crossover Hall-Petch strengthening inverse Hall-Petch weakening 

分 类 号:O469[理学—凝聚态物理]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象