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Equilibrium ternary intermetallic phase in the Mg-Zn-Ca system

机译：Mg-Zn-Ca体系中的平衡三元金属间相

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摘要

This study investigates the ternary intermetallic phases in the Mg-Zn-Ca system, which is of great interest for metallic biodegradable implant applications. According to published phase diagrams, the key alloy composition studied herein is located within the Ca_2Mg_5Zn_5, Ca_2Mg_6Zn_3, and IM1 phase fields. Through controlled cooling of the melt, a quasibinary ～Ca_2Mg_5Zn_5-Mg microstructure was obtained. The large polygonal grains had a composition of Ca_2Mg_5Zn_5 as determined by energy-dispersive x-ray spectroscopy (EDX). Differential scanning calorimetry revealed that Ca_2Mg_5Zn_5 begins to form at ～417 ℃, and the eutectic temperature is ～369 ℃. Based on single-crystal x-ray diffraction data, Ca_2Mg_5Zn_5 was determined to be hexagonal (P6_3/mmc), with lattice parameters of a = 9.5949(3) A and c = 10.0344(3) A. This was also verified by transmission electron microscopy. Further refinements, which considered the possibility of mixed Mg/Zn sites, significantly improved the data fit compared to the initial ordered structural model. The final refined structure possesses a composition of Ca_(16)Mg_(42)Zn_(42), very similar to the chemical analysis results from EDX.
机译：这项研究调查了Mg-Zn-Ca系统中的三元金属间相，这对于可生物降解的金属植入物应用非常重要。根据公开的相图，本文研究的关键合金成分位于Ca_2Mg_5Zn_5，Ca_2Mg_6Zn_3和IM1相场内。通过控制熔体的冷却，获得了准二元〜Ca_2Mg_5Zn_5-Mg组织。通过能量色散X射线光谱法（EDX）测定，大的多边形晶粒具有Ca_2Mg_5Zn_5的组成。差示扫描量热法表明，Ca_2Mg_5Zn_5在〜417℃开始形成，共晶温度为〜369℃。根据单晶x射线衍射数据，确定Ca_2Mg_5Zn_5为六边形（P6_3 / mmc），晶格参数为a = 9.5949（3）A和c = 10.0344（3）A。这也由透射电子验证显微镜检查。与最初的有序结构模型相比，进一步的改进（考虑了Mg / Zn混合位点的可能性）大大改善了数据拟合度。最终的精炼结构具有Ca_（16）Mg_（42）Zn_（42）的成分，与EDX的化学分析结果非常相似。

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  • 来源
    《Journal of Materials Research》 |2016年第14期|2147-2155|共9页
  • 作者

    Jake D. Cao; Thomas Weber; Robin Schaeublin; Joerg F. Loeffler;

  • 作者单位

    Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Laboratory of Crystallography, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;

  • 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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