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Dual-phase nanostructuring as a route to high-strength magnesium alloys

机译：双相纳米结构作为高强度镁合金的一种途径

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摘要

It is not easy to fabricate materials that exhibit their theoretical 'ideal' strength. Most methods of producing stronger materials are based on controlling defects to impede the motion of dislocations, but such methods have their limitations. For example, industrial single-phase nanocrystalline alloys(1,2) and single-phase metallic glasses(3) can be very strong, but they typically soften at relatively low strains (less than two per cent) because of, respectively, the reverse Hall-Petch effect(4) and shear-band formation. Here we describe an approach that combines the strengthening benefits of nanocrystallinity with those of amorphization to produce a dualphase material that exhibits near-ideal strength at room temperature and without sample size effects. Our magnesium-alloy system consists of nanocrystalline cores embedded in amorphous glassy shells, and the strength of the resulting dual-phase material is a near-ideal 3.3 gigapascals-making this the strongest magnesiumalloy thin film yet achieved. We propose a mechanism, supported by constitutive modelling, in which the crystalline phase (consisting of almost-dislocation-free grains of around six nanometres in diameter) blocks the propagation of localized shear bands when under strain; moreover, within any shear bands that do appear, embedded crystalline grains divide and rotate, contributing to hardening and countering the softening effect of the shear band.
机译：制造具有理论“理想”强度的材料并不容易。大多数生产更坚固材料的方法都是基于控制缺陷以阻止位错运动的，但是这种方法有其局限性。例如，工业单相纳米晶合金（1,2）和单相金属玻璃（3）可能非常坚固，但由于相反的作用，它们通常在相对较低的应变（小于百分之二）下会软化。 Hall-Petch效应（4）和剪切带形成。在这里，我们描述了一种方法，该方法结合了纳米结晶度和非晶化的增强优点，以生产在室温下显示出接近理想强度且没有样品大小影响的双相材料。我们的镁合金系统由嵌入无定形玻璃状壳中的纳米晶核组成，所得到的双相材料的强度接近3.3吉帕斯卡-使其成为迄今获得的最坚固的镁合金薄膜。我们提出了一种由本构模型支持的机制，其中结晶相（由直径约为6纳米的几乎无位错的晶粒组成）在应变作用下阻止了局部剪切带的传播。此外，在确实出现的任何剪切带中，嵌入的晶粒会分裂并旋转，从而有助于增强并抵消剪切带的软化效果。

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  • 来源
    《Nature》 |2017年第7652期|80-83|共4页
  • 作者

    Wu Ge; Chan Ka-Cheung; Zhu Linli; Sun Ligang; Lu Jian;

  • 作者单位

    City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China;

    City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China;

    City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China|Zhejiang Univ, Dept Engn Mech, Hangzhou 310027, Zhejiang, Peoples R China|Zhejiang Univ, Key Lab Soft Machines & Smart Devices Zhejiang Pr, Hangzhou 310027, Zhejiang, Peoples R China;

    City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China;

    City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China|City Univ Hong Kong, Shenzhen Res Inst, Ctr Adv Struct Mat, 8 Yuexing 1st Rd,Shenzhen Hi Tech Ind Pk, Shenzhen, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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