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Impacts of artificial aging state on the creep resistance of a rolled Mg-3.5Nd alloy

机译：人工老化状态对轧制Mg-3.5 Nd合金蠕变电阻的影响

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摘要

This study investigates the impacts of artificial aging state on the tensile creep resistance of a hot-rolled Mg-3.5 wt%Nd alloy. The alloy was heat treated under different conditions, including solution treatment at 490 °C, under-aging for 2, 5, and 10 h, and peak-aging for 20 h at 220 °C. The samples were abbreviated as AS, A2, A5, A10, and A20, respectively. After aging for 2 h, many precipitates appeared in the under-aged A2 sample, most of which were lenticular β′-phase precipitates. With an increasing aging duration, β′ transitioned to β_1, and substantial solute depletion was observed. The A2 sample had no precipitate-free zone (PFZ), but PFZs formed in A5, widened in A10, and evolved into the widest in the peak-aged A20 sample. During creep testing at 250 °C, β_1 phases precipitated in the AS sample, and atomic diffusion induced the formation and widening of PFZs. Pyramidal dislocations and β_1 dissolution induced grain boundary migration and rapid PFZ widening in the A20 sample, which was less obvious in the A10 and A5 samples. The slightest solute depletion in the grain boundaries during artificial aging and the unconspicuous β_1 dissolution during creep testing avoided fast PFZ widening in the A2 sample. Consequently, although the A20 sample had the highest strength at room temperature, wide PFZs and grain boundary migration led to severe stress concentration and deteriorated its creep resistance. Narrow PFZs and dislocations cutting the β′ phases in the A2 sample led to the best creep resistance.
机译：本研究研究了人工老化状态对热轧Mg-3.5wt％Nd合金的拉伸蠕变电阻的影响。将合金在不同条件下进行热处理，包括在490℃下的溶液处理，欠老化2,5和10小时，并在220℃下峰值老化20小时。将样品分别缩写为A2，A5，A10和A20。老化2小时后，在欠老化的A2样品中出现了许多沉淀物，其中大部分是双凸β的沉淀物。随着衰老的持续时间增加，观察到转变为β11的β'和显着的溶质耗尽。 A2样品没有无沉淀区（PFZ），但在A5中形成的PFZ，在A10中加宽，并进化到峰值老化A20样品中最宽的。在250℃的蠕变测试期间，在样品中沉淀的β_1相位，原子扩散诱导PFZ的形成和加宽。金字塔脱臼和β_1溶解诱导的晶界迁移和快速PFZ在A20样品中加宽，在A10和A5样品中不太明显。人工老化期间晶界中最轻微的溶质耗竭和蠕变测试期间的不合理的β-1溶解避免了A2样品中的快速PFZ加宽。因此，尽管A20样品在室温下具有最高强度，但宽的PFZ和晶界迁移导致严重的应力浓度并劣化其抗蠕变性。将A2样品中的β'相切割的窄的PFZ和脱位导致了最佳的抗蠕变性。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141491.1-141491.12|共12页
  • 作者

    Zhirou Zhang; Qinghuan Huo; Yuxiu Zhang; Zhenyu Xiao; Aki Hashimoto; Xuyue Yang;

  • 作者单位

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering School of Materials Science and Engineering Central South University Changsha 410083 China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering School of Materials Science and Engineering Central South University Changsha 410083 China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering School of Materials Science and Engineering Central South University Changsha 410083 China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering School of Materials Science and Engineering Central South University Changsha 410083 China;

    Technology Div. Nippon Paint Surf Chemicals Co. LTD. 4-1-15 Minamishinagawa Shinagawa-ku Tokyo 140-8675 Japan;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering School of Materials Science and Engineering Central South University Changsha 410083 China;

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  • 正文语种 eng
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  • 关键词

    Magnesium; Creep; Aging; Precipitation; Slip;

    机译：镁;蠕动;老化;沉淀;滑;

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