Layer thickness dependent plastic deformation mechanism in Ti/TiCu dual-phase nano-laminates  

作　　者：安敏荣 雷岳峰 宿梦嘉 刘兰亭 邓琼 宋海洋 尚玉 王晨 Minrong An;Yuefeng Lei;Mengjia Su;Lanting Liu;Qiong Deng;Haiyang Song;Yu Shang;Chen Wang(College of New Energy,Xi'an Shiyou University,Xi'an 710065,China;Fundamental Science on Aircraft Structural Mechanics and Strength Laboratory,Northwestern Polytechnical University,Xi'an 710072,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;College of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]College of New Energy,Xi'an Shiyou University,Xi'an 710065,China [2]Fundamental Science on Aircraft Structural Mechanics and Strength Laboratory,Northwestern Polytechnical University,Xi'an 710072,China [3]School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China [4]College of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China

出　　处：《Chinese Physics B》2023年第6期435-446,共12页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51902254 and 12072286);the Natural Science Foundation of Shaanxi Province,China(Grant Nos.2021JZ-53 and 2018JQ5108);the Scientific Research Program Funded by Shaanxi Provincial Education Department,China(Grant No.20JK0845)。

摘　　要：Crystalline/amorphous nanolaminate is an effective strategy to improve the mechanical properties of metallic materials,but the underlying deformation mechanism is still under the way of exploring.Here,the mechanical properties and plastic deformation mechanism of Ti/TiCu dual-phase nanolaminates(DPNLs)with different layer thicknesses are investigated using molecular dynamics simulations.The results indicate that the influence of the layer thickness on the plastic deformation mechanism in crystalline layer is negligible,while it affects the plastic deformation mechanism of amorphous layers distinctly.The crystallization of amorphous TiCu is exhibited in amorphous parts of the Ti/TiCu DPNLs,which is inversely proportional to the layer thickness.It is observed that the crystallization of the amorphous TiCu is a process driven by stress and heat.Young's moduli for the Ti/TiCu DPNLs are higher than those of composite material due to the amorphous/crystalline interfaces.Furthermore,the main plastic deformation mechanism in crystalline part:grain reorientation,transformation from hexagonal-close-packed-Ti to face-centered cubic-Ti and body-centered cubic-Ti,has also been displayed in the present work.The results may provide a guideline for design of high-performance Ti and its alloy.

关 键 词：dual-phase nanolaminate molecular dynamics simulation deformation mechanism CRYSTALLIZATION 

分 类 号：O344.1[理学—固体力学] TB383.1[理学—力学]