3(Sc,Zr)相;雙峰晶粒;亞晶粒;強化機制"/> 3(Sc,Zr)相的存在與共同作用促進了具有較大晶格畸變、存在大量亞晶及均勻彌散分布析出相的雙峰晶粒組織的形成；合金主要強化方式為鎂原子的固溶強化、亞晶界阻礙位錯引起的亞晶界強化、細晶強化和Al3(Sc,Zr)相的彌散強化,且合金計算與實測屈服強度相吻合；高鎂固溶度、Al3(Sc,Zr)相、雙峰晶粒及再結晶織構的存在為位錯增殖提供了空間,提高了合金加工硬化率,進而提高了合金的延伸率。"/>

最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級檢索
高鎂低鈧Al-Mg-Sc-Zr合金強韌化機理研究
作者:
作者單位:

清華大學材料學院先進材料教育部國家重點實驗室

作者簡介:

通訊作者:

中圖分類號:

基金項目:

清華大學自主科研計劃及中國國家科技部國際科技合作專項資金(No. 2015DFR50470)資助


Strengthening and toughening mechanisam of high Mg low Sc Al-Mg-Sc-Zr alloy
Author:
Affiliation:

School of Materials Science and Engineering,Tsinghua University

Fund Project:

Tsinghua University Initiative Scientific Research Program and the National and International Scientific and Technological Cooperation Projects of China No.2015DFR50470

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻
    • |
  • 相似文獻
    • |
  • 引證文獻
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    本文通過常規(guī)軋制與退火工藝制備了具有高抗拉強度(~502MPa)和高斷后延伸率(~22%)的高鎂低鈧Al-Mg-Sc-Zr合金,退火工藝為673K/1h。通過X射線衍射儀(XRD)、電子背散射衍射儀(EBSD)和透射電子顯微鏡(TEM)等手段,研究了合金退火后的組織及其強化機制。結果表明：Al-Mg-Sc-Zr合金在退火后獲得了具有尺寸為0.42 μm的小晶粒和尺寸為16.2μm的大晶粒的雙峰晶粒組織,固溶鎂原子與Al3(Sc,Zr)相的存在與共同作用促進了具有較大晶格畸變、存在大量亞晶及均勻彌散分布析出相的雙峰晶粒組織的形成；合金主要強化方式為鎂原子的固溶強化、亞晶界阻礙位錯引起的亞晶界強化、細晶強化和Al3(Sc,Zr)相的彌散強化,且合金計算與實測屈服強度相吻合；高鎂固溶度、Al3(Sc,Zr)相、雙峰晶粒及再結晶織構的存在為位錯增殖提供了空間,提高了合金加工硬化率,進而提高了合金的延伸率。

    Abstract:

    In current research, a novel Al-Mg-Sc-Zr alloy was produced through conventional rolling and annealing process and achieved a high thermal stability, a high ultimate strength (UTS) of 501.7 MPa, a high yield strength (YS) of 320.4 MPa and a high elongation to failure of 21.6%. X-ray diffraction(XRD), electron backscattered diffraction (EBSD) and transmission electron microscope (TEM) were utilized to observe the microstructure of samples. As a result, complex effects of solute Mg atoms and precipitate of Al3(Sc,Zr) precipitation promoted formation of microstructure with large lattice misfit, sub-grain and dispersive distributed Al3(Sc,Zr) precipitation. The main mechanisms for observed high strength were found to be due to the solid solution of Mg and precipitate of Al3(Sc,Zr) precipitation, theoretical strength is in agreement with experimental strength. The presence of bimodal grain structure which was first found in conventional rolling structure and Al3(Sc,Zr) precipitation provided space for dislocation accumulation, improved the dislocation storage capacity of the alloy, and then directly increases the elongation of the alloy.

    參考文獻
    相似文獻
    引證文獻
引用本文

封蕾,李建國,毛軼哲.高鎂低鈧Al-Mg-Sc-Zr合金強韌化機理研究[J].稀有金屬材料與工程,2019,48(9):2857~2863.[Feng Lei, Li Jianguo, Mao Yizhe. Strengthening and toughening mechanisam of high Mg low Sc Al-Mg-Sc-Zr alloy[J]. Rare Metal Materials and Engineering,2019,48(9):2857~2863.]
DOI：10.12442/j. issn.1002-185X.20180490

復制
文章指標
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2018-05-14
  • 最后修改日期:2018-07-03
  • 錄用日期:2018-07-31
  • 在線發(fā)布日期: 2019-10-09
  • 出版日期: