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首页> 外文期刊>Materials Science and Engineering >Deformation behavior and strengthening mechanisms in a CNT-reinforced bimodal-grained aluminum matrix nanocomposite
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Deformation behavior and strengthening mechanisms in a CNT-reinforced bimodal-grained aluminum matrix nanocomposite

机译：CNT增强双峰粒子基质基质纳米复合材料中的变形行为和强化机制

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摘要

The aim of this study was to identify deformation behavior and strengthening mechanisms of a carbon nanotube (CNT)-reinforced bimodal-grained Al-Cu-Mg nanocomposite and its base alloy fabricated by two-step ball milling, powder metallurgy and extrusion. A superior strength-ductility synergy stemming from the concurrent presence of ultrafine grains (UFGs) and coarse grains (CGs) was achieved. Singly-dispersed CNTs in UFGs and sound CNT/Al interfacial bond contributed to a significant improvement in the strength of the nanocomposite. The predominant strengthening mechanism in the CNT-reinforced nanocomposite was identified to be Orowan looping due to severe shearing of CNTs into nano-sized fragments during ball milling, along with load-transfer and thermal mismatch-induced dislocation strengthening mechanisms. The predicted yield strength of the nanocomposite was in agreement with the experimental value obtained. The findings in this study help pave the way for developing high-performance lightweight materials with a superior strength-ductility synergy via incorporating CNTs with novel bimodal grain structures.
机译：该研究的目的是鉴定碳纳米管（CNT） - 胁迫双晶粒粒子的变形行为和强化机制 - 通过两步球磨，粉末冶金和挤出制造的碳纳米管（CNT）的碳纳米粒子（CNT）的双晶粒颗粒纳米复合材料及其基础合金。实现了源于超细晶粒（UFGS）和粗晶粒（CGS）的同时存在的优异的强度 - 延展性协同作用。 UFGS和声音CNT / Al界面键的单分散的CNT有助于纳米复合材料强度的显着改善。鉴定CNT增强纳米复合材料中的主要加强机制是由于CNTS在球磨期间CNTS的严重剪切成纳米型片段，以及负载转移和热失配诱导的位错强化机制。纳米复合材料的预测屈服强度与获得的实验值一致。本研究中的调查结果有助于铺平为开发高性能轻质材料，通过掺入具有新型双峰结构的CNT来开发高性能轻质材料，具有优异的强度 - 延展性协同作用。

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  • 来源
    《Materials Science and Engineering》 |2021年第10期|141370.1-141370.9|共9页
  • 作者

    S.M.A.K. Mohammed; D.L. Chen; Z.Y. Liu; D.R. Ni; Q.Z. Wang; B.L. Xiao; Z.Y. Ma;

  • 作者单位

    Department of Mechanical and Industrial Engineering Ryerson University Toronto Ontario M5B 2K3 Canada;

    Department of Mechanical and Industrial Engineering Ryerson University Toronto Ontario M5B 2K3 Canada;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metal matrix nanocomposites; Bimodal grain structure; Carbon nanotube; Deformation behavior; Strengthening mechanisms;

    机译：金属基质纳米复合材料;双峰晶粒结构;碳纳米管;变形行为;加强机制;

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