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首页> 外文期刊>Materials Science and Engineering >Mechanism of microstructural refinement of deformed aluminum under synergistic effect of TiAl_3 and TiB_2 particles and impact on mechanical properties
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Mechanism of microstructural refinement of deformed aluminum under synergistic effect of TiAl_3 and TiB_2 particles and impact on mechanical properties

机译：TiAl_3和TiB_2的协同作用下变形铝的组织细化机理及其对力学性能的影响

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摘要

To understand the synergistic effect of TiAl3and TiB2particles on grain refinement of α-Al, equal-channel angular pressing (ECAP) of Al-5Ti-1B (wt%) alloy was carried out. The ECAPed Al-5Ti-1B (wt%) alloy was characterized by X-ray Diffraction (XRD), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The results reveal that α-Al grains and TiAl3phase of ECAPed Al-5Ti-1B (wt%) alloy were refined, while the average size of TiB2was marginally decreased. The tensile strength was increased from 128MPa to 218MPa, and the elongation was reduced from 26% to 20.6%. The transformation from dislocations to low-angle grain boundaries (LAGBs) and high-angle grain boundaries (HAGBs) resulted in continuous dynamic recrystallization (CDRX), which induced grain refinement during ECAP. From 3 to 6 passes of ECAP, CDRX occurred in the alloy, and as ECAP passes increased to 9, the rate of formation of LAGBs and the transformation rate from LAGBs to HAGBs reached a dynamic balance. The present study indicates that the second phase particles promote the formation of LAGBs but prolong complete-recrystallization time, such that complete-recrystallization leads to grain refinement. TiB2particles are smaller than TiAl3particles and this is caused by the composition of the alloy and its synthesis method, and compared with TiAl3, TiB2with a smaller size had a more obvious influence on the formation of LAGBs and grain refinement.
机译：为了了解TiAl3和TiB2颗粒对α-Al晶粒细化的协同作用，对Al-5Ti-1B（wt％）合金进行了等通道角挤压（ECAP）。 ECAPed Al-5Ti-1B（wt％）合金的特征在于X射线衍射（XRD），电子背散射衍射（EBSD）和透射电子显微镜（TEM）。结果表明，ECAPed Al-5Ti-1B（wt％）合金的α-Al晶粒和TiAl3相得到细化，而TiB2的平均尺寸略有减小。拉伸强度从128MPa增加到218MPa，伸长率从26％减少到20.6％。从位错到低角度晶界（LAGBs）和高角度晶界（HAGBs）的转变导致了连续动态重结晶（CDRX），从而在ECAP期间引起晶粒细化。从ECAP通过3到6次，合金中发生了CDRX，随着ECAP通过至9次，LAGB的形成速率和从LAGB到HAGB的转化率达到了动态平衡。本研究表明，第二相颗粒促进了LAGBs的形成，但延长了完全重结晶时间，从而使完全重结晶导致晶粒细化。 TiB2颗粒比TiAl3颗粒小，这是由合金的组成及其合成方法引起的，与TiAl3相比，尺寸较小的TiB2对LAGBs的形成和晶粒细化的影响更大。

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  • 来源
    《Materials Science and Engineering》 |2018年第14期|129-139|共11页
  • 作者

    Renguo Guan; R.D.K. Misra; Yingqiu Shang; Yanan An; Yuxiang Wang; Yang Zhang; Di Tie;

  • 作者单位

    School of Materials Science and Engineering, Northwestern Polytechnical University,School of Materials Science and Engineering, Northeastern University;

    Department of Metallurgical and Materials Engineering, Department of Metallurgical and Materials Engineering, University of Texas at El Paso;

    School of Materials Science and Engineering, Northeastern University;

    School of Materials Science and Engineering, Northwestern Polytechnical University;

    School of Materials Science and Engineering, Northeastern University;

    School of Materials Science and Engineering, Northeastern University;

    School of Materials Science and Engineering, Northeastern University;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Al-5Ti-1B (wt) alloy; Grain refinement; Second phase particles; Dynamic recrystallization;

    机译：Al-5Ti-1B（wt％）合金;晶粒细化;第二相颗粒;动态重结晶;

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