Insights into the microstructures and mechanical properties of magnesium-calcium-transition elements: A combined experimental and simulation study
Insights into the microstructures and mechanical properties of magnesium-calcium-transition elements: A combined experimental and simulation study
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深入了解镁钙过渡元素的微观结构和机械性能：实验与模拟相结合的研究
DOI：
10.1016/j.actamat.2023.118958
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发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Chino Yasumasa
中科院分区：
文献类型：
--
作者：
Bian Mingzhe;Matsuoka Yusuke;Huang Xinsheng;Ishiguro Yuya;Tsukada Yuhki;Koyama Toshiyuki;Chino Yasumasa
Mg-0.1Ca (wt%) 合金中添加了少量过渡元素：Ti、Mn、Fe、Co 和 Ni，以阐明它们的添加对微观结构和室温 (RT) 机械性能的影响。只有Ni能有效减弱织构强度，从而提高RT成形性和延展性，而其他元素基本没有作用。通过高角度环形暗场扫描透射电子显微镜 (HAADF-STEM) 结合能量色散 X 射线光谱 (EDS) 和使用晶界 (GB) 相模型的数值模拟进行的微观结构表征表明，Ca 和 Ni 共偏析到含 Ni 合金的 GB 中，而其他合金的 GB 中仅富含 Ca。通过相关电子背散射衍射和 STEM-EDS 的进一步研究表明，与基础取向的晶界相比，横向（TD）取向的晶界的 Ca 和 Ni 浓度显着降低，从而导致含镍合金中出现 TD 分裂织构。成分优化的 Mg-0.1Ca-0.1Ni (wt%) 合金在片材形式下表现出 8.5 mm 的大指数埃里克森值，在挤压棒材形式下表现出 238 MPa 的高拉伸屈服强度和 14% 的中等断裂伸长率。由于添加了少量合金元素，新开发的Mg–0.1Ca–0.1Ni合金具有154 W/(m·K)的优异导热率，甚至高于商用5052铝合金。
Small amounts of transition elements: Ti, Mn, Fe, Co, and Ni, have been added to a Mg–0.1Ca (wt%) alloy to elucidate their additions on the microstructure and room temperature (RT) mechanical properties. Only Ni was effective in weakening the texture intensity and thus led to the improvement in RT formability and ductility, whereas the other elements were basically no effect. The microstructural characterization by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) in conjunction with energy-dispersive X-ray spectrometry (EDS) and numerical simulation using a grain boundary (GB) phase model indicates that the Ca and Ni co-segregated to the GB of the Ni-containing alloy, while the GB of the other alloys was enriched with Ca only. Further investigations by a correlative electron backscatter diffraction and STEM-EDS reveal that the transverse direction (TD) oriented GBs had significantly lower concentration of Ca and Ni compared to the basal-oriented GBs, which resulted in the development of the TD-split texture in the Ni-containing alloy. A compositionally optimized Mg–0.1Ca–0.1Ni (wt%) alloy showed a large index Erichsen value of 8.5 mm in the sheet form, and exhibited a high tensile yield strength of 238 MPa with a moderate fracture elongation of 14% in the form of an extruded rod. Due to the addition of small amounts of alloying elements, the newly developed Mg–0.1Ca–0.1Ni alloy had an excellent thermal conductivity of 154 W/(m·K) which is even higher than that of a commercial 5052 Al alloy.