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Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime

机译：Zr基非晶态合金在均匀流态下的变形和结晶

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摘要

The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr_(41. 25)Ti_(3.75)Cu_(12.5)Ni_(10)Be_(22.5) (commercially designated as Vitreloy 1 or Vitl) and Zr_(46.75)Ti_(13.25)CU_(7.5)Ni_(10)Be_(27.5) (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vitl featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys.
机译：这项研究的目的是实验研究两种Zr基块状金属玻璃（BMG）的非弹性形变与微观结构变化的相互作用：Zr_（41。25）Ti_（3.75）Cu_（12.5）Ni_（10）Be_（22.5） （商业上称为Vitreloy 1或Vitl）和Zr_（46.75）Ti_（13.25）CU_（7.5）Ni_（10）Be_（27.5）（Vitreloy 4，Vit4）。对两种Zr合金以不同的应变速率进行了高温单轴压缩测试，然后使用差示扫描量热法（DSC）和透射电子显微镜（TEM）对结构进行了表征。观察到两种合金中两种不同的机械诱导的原子无序模式，其中，Vitl具有清晰的相分离和变形后的结晶，如通过TEM观察到的，而Vit4仅显示出结构弛豫而没有结晶。通过跳变速率试验进一步研究了结构变化对两种材料的机械性能的影响，并在Vit4中观察到流动软化。应用自由体积理论来解释变形行为，并计算了两种合金的活化体积。

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  • 来源
    《Journal of Materials Research》 |2010年第6期|1137-1148|共12页
  • 作者

    Min Tao; Atul H. Chokshi; Robert D. Conner; Guruswami Ravichandran; William L. Johnson;

  • 作者单位

    Intel Corporation, Chandler, Arizona 85226;

    rnDepartment of Metallurgy, Indian Institute of Science, Bangalore 560012, India;

    rnDepartment of Manufacturing Systems Engineering and Management,California State University-Northridge, Northridge, California 91330;

    rnGraduate Aerospace Laboratories, California Institute of Technology, Pasadena, California 91125;

    rnKeck Laboratories of Material Science, California Institute of Technology, Pasadena, California 91125;

  • 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);
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  • 正文语种 eng
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