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首页> 外文期刊>Materials Science and Engineering >Correlation of static recrystallization and texture weakening of AZ31 magnesium alloy sheets subjected to high speed rolling
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Correlation of static recrystallization and texture weakening of AZ31 magnesium alloy sheets subjected to high speed rolling

机译：高速轧制AZ31镁合金薄板静态再结晶与组织弱化的关系

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摘要

MagnesiumAZ31 alloy sheets were rolled at a high speed of 1000 m/min(HSR) and a low speed of 15 m/ min(LSR) at 100 ℃ to a reduction of 30%. The as-rolled microstructures were heavily twinned and shear banded at both speeds. Annealing was performed on the as-rolled sheets at three different temperatures (200, 350 and 500 ℃) for increasing time intervals. Texture weakening was achieved after annealing of both HSRed and LSRed sheets due to static recrystallization (SRX) on twins and shear bands. This, in turn, greatly improved the ductility of the sheets. It was found that the intensities of the basal texture of the HSRed specimens were lower than those of the LSRed specimens at as-rolled and all annealed conditions. This is related to the higher amount of contraction twins and more < c+a > slips activated during HSR. Correlation of the maximum intensity of the basal texture with softening/recrystallization fraction was found to be involved in two weakening stages. During the first stage, nucleation on twins and shear bands was the dominant mechanism for texture weakening, while growth of the non-basal grains was responsible for the second stage of texture weakening. Interestingly, it was found that the weakest texture was attained after annealing at 500 ℃ for 5 min in the HSRed specimen, which can be related to thermal activation of more random nucleation sites and preferential grain growth of the non-basal oriented grains.
机译：将镁AZ31合金薄板在100℃下以1000 m / min（HSR）的高速度和15 m / min（LSR）的低速进行压延至30％。轧制后的微观结构在两个速度下都严重孪生并形成剪切带。在三个不同温度（200、350和500℃）下对轧制板进行退火，以增加时间间隔。 HSRed和LSRed片材均在退火后由于双晶和剪切带上的静态再结晶（SRX）而实现了纹理减弱。反过来，这极大地改善了片材的延展性。发现在轧制和所有退火条件下，HSRed标本的基础纹理强度均低于LSRed标本的强度。这与更高数量的收缩孪生子和更多的cSR滑移在高铁过程中有关。发现基础结构的最大强度与软化/再结晶分数的相关性涉及两个弱化阶段。在第一阶段，孪晶和剪切带上的成核作用是织构减弱的主要机理，而非基础晶粒的生长则是织构减弱的第二阶段。有趣的是，发现HSRed试样在500℃下退火5分钟后，获得了最弱的织构，这可能与更多随机成核位点的热活化和非基体取向晶粒的优先晶粒生长有关。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|343-360|共18页
  • 作者

    Jing Su; Abu Syed H. Kabir; Mehdi Sanjari; Steve Yue;

  • 作者单位

    Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, Quebec, Canada H3A0C5;

    Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, Quebec, Canada H3A0C5;

    CanmetMATERIALS, Natural Resources Canada, Hamilton, ON, Canada L8P0A5;

    Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, Quebec, Canada H3A0C5;

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

    EBSD; Magnesium alloy; Recrystallization; Twinning and grain growth;

    机译：EBSD;镁合金重结晶;孪生与晶粒长大;

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