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Achieving ultra-high hardness of Mg-Sm-Ca alloy with the unique nanostructure

机译：用独特的纳米结构实现MG-SM-CA合金的超高硬度

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摘要

Most magnesium rare-earth (Mg-RE) alloys have limited hardness. Here a new strategy is proposed, that is, the solution treated Mg-4.97Sm-0.84Ca (wt.%) alloy was subjected to hot rolling processing and high-pressure torsion (HPT) processing, followed by aging for various periods. The ultra-high hardness value of ～175 H V for Mg-Sm-Ca alloys processed by hot rolling and HPT after aging at 150 °C for 3.5 h is achieved which is -109 H V higher than as-solution alloy (～66 H V). Such an unprecedentedly high hardness value is mainly attributed to the unique nanostructure in the alloy which contains high-density nano-precipitates which have low lattice misfit with the matrix. We found that the morphological of the Mg_(41)Sm_5 phase was changed from rod-like to kink band-like by HPT processing and then convert into dense, near-spherical shape particles during the subsequent aging process to form isotropic structure which provides exceptional strengthening for the alloy.
机译：大多数稀土（Mg-Re）合金的硬度有限。 在这里提出了一种新的策略，即溶液处理的Mg-4.97sm-0.84Ca（重量％）合金经受热轧加工和高压扭转（HPT）加工，然后进行各种时期的老化。 通过热轧和150℃下老化后，通过热轧和HPT处理3.5小时的Mg-SM-CA合金的超高硬度值为3.5小时，高于尽可能溶液合金（〜66HV） 。 这种前所未有的高硬度值主要归因于合金中的独特纳米结构，其含有高密度纳米沉淀物的纳米沉淀物，其具有低晶格与基质的错量。 我们发现Mg_（41）SM_5相的形态通过HPT加工从棒状到扭结带状物改变，然后在随后的老化过程中转化成致密，近球形形状颗粒以形成各向同性的结构，提供卓越的 加强合金。

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  • 来源
    《Materials Science and Engineering》 |2021年第21期|141929.1-141929.10|共10页
  • 作者

    Xiaohuan Liu; Rui Xu;

  • 作者单位

    State Key Lab of Metastable Materials Science & Technology Hebei Key Lab of for Optimizing Metal Product Technology and Performance College of Materials Science & Engineering Yanshan University Qinhuangdao 066004 China;

    State Key Lab of Metastable Materials Science & Technology Hebei Key Lab of for Optimizing Metal Product Technology and Performance College of Materials Science & Engineering Yanshan University Qinhuangdao 066004 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Mg-Sm-Ca alloy; Hot rolling; High-pressure torsion; Hardness; Aging; Nano-precipitates;

    机译：MG-SM-CA合金;热轧;高压扭转;硬度;老化;纳米沉淀物;

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