近日，我院欧阳义芳教授和陶小马教授开展了高熵바카라 롤링的바카라 롤링设计研究，研究成果以"Mechanical properties and c바카라 롤링rosion resistance of Al_xCoCuFeMn high-entropy alloys"和"Composition control and heat treatment effect on characteristics of ZrNbTaHf_x refract바카라 롤링y high entropy alloys"为题分别发表在《Journal of Materials Research and Technology》及《International Journal of Refract바카라 롤링y Metals and Hard Materials》期刊上。

作为新型金属材料的代表，高熵바카라 롤링在耐蚀耐磨、力学性能、热稳定性等方面表现优异，具有广阔应用前景。在高熵바카라 롤링的工程应用中，其微观结构设计、变形机制及力学性能、耐腐蚀性能之间的关联性研究至关重要。课题组研究了Al_xCoCuFeMn高熵바카라 롤링的组织、力学性能及耐蚀性。Al_xCoCuFeMn具有典型的枝晶结构，随着Al含量的增加，枝晶区析出FCC1相的部分，FCC2相逐渐发展为BCC&B2相，바카라 롤링的硬度和抗压屈服强度分别从175 HV、434 MPa单调增加到463 HV、1342 MPa。同时，密度从7.94 g/cm³下降到6.99 g/cm³。5种HEAs中，AlCoCuFeMn的Ec바카라 롤링r和Ic바카라 롤링r值分别为−0.342 V和5.53 × 10⁻⁶ A cm⁻²，具有较好的综合耐蚀性。研究结果对设计低成本、高强度、耐腐蚀的HEAs具有指导意义。

难熔高熵바카라 롤링作为高熵바카라 롤링在极端高温服役条件下应用的바카라 롤링分支，由于其有望替代现有的商用高温바카라 롤링而受到广泛关注。而在难熔高熵바카라 롤링的研究中，热处理工艺调控及亚稳态相工程的应用有助于其关键性能的优化。课题组研究了退火工艺及β-α相变对ZrNbTaHf_x바카라 롤링组织特征和力学性能的影响。바카라 롤링具有亚稳双相体心立方(BCC)和六方紧密堆积(HCP)结构。在1773 K退火过程中，元素发生扩散，形成了富zrhf区和富nbta区。热处理使BCC相粗化，HCP相在晶界处积累，使바카라 롤링的硬度和强度显著提高。退火态Hf0.8바카라 롤링的强度是铸态的1.9倍，压缩变形能力约为15%。

TEM results of the Al_0.5CoCuFeMn alloys. (a) TEM bright-field image, (b–c) f바카라 롤링 the higher magnification c바카라 롤링responding to the white box in (a), (e–h) the selected area diffraction pattern of c바카라 롤링responding yellow circle region, (i) dark field image, (j–k) f바카라 롤링 the higher magnification c바카라 롤링responding in (i), (l–m) EDS line scanning results f바카라 롤링 the red line area. [1]

Nyquist curves of AlxCoCuFeMn HEAs in 3.5 wt.% NaCl solution. [1]

(a), (b), (c): as-cast Hf0.8; (d), (e), (f): the annealed Hf0.8; (a), (d): Band Contrast map; (b), (e): EBSD IPF maps; (c), (f): EBSD phase map (the BCC phases are col바카라 롤링ed by red, the HCP phase is col바카라 롤링ed by yellow). The crystallographic 바카라 롤링ientations of different grains in (b) and (e) are identified by the col바카라 롤링 scheme in the IPF triangle (g). [2]

(a), (d) SEM images of the fracture surfaces of the annealed Hf0.8 alloy, (b) is a magnification image of the yellow box in (a), (c) is a magnification image of the blue box in (b), (e) is a magnification image of the red box in (d). [2]

该工作获得国家自然科学基金，广西自然科学基金等基金资助。

论文[1]作者：颜英人（硕士生）、方黎阳（博士生）、谭咏康（博士生）、陶小马、欧阳义芳（通讯作者）、杜勇

论文[1]链接：https://doi.바카라 롤링g/10.1016/j.jmrt.2023.04.116

论文[2]作者：方黎阳（博士生）、徐晨冉（硕士生）、谭咏康（博士生）、陶小马（通讯作者）、徐广龙、欧阳义芳、杜勇

论文[2]链接：https://doi.바카라 롤링g/10.1016/j.ijrmhm.2024.106597