The tensile property and notch sensitivity of AlCoCrFeNi2.1 high entropy alloy with a novel “steel-frame” eutectic microstructure
The tensile property and notch sensitivity of AlCoCrFeNi2.1 high entropy alloy with a novel “steel-frame” eutectic microstructure
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DOI：
10.1016/j.jallcom.2021.158747
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发表时间：
2021-05
影响因子：
6.2
通讯作者：
Wei Zhang;Liang Liu;Siyuan Peng;Jie Ren;Fu-fa Wu;Jian Shang;Minghua Chen;Yue Zhang;Zuo-fu Zhao;J. Qi;Bing Wang;W. Chen
中科院分区：
文献类型：
--
作者：
Wei Zhang;Liang Liu;Siyuan Peng;Jie Ren;Fu-fa Wu;Jian Shang;Minghua Chen;Yue Zhang;Zuo-fu Zhao;J. Qi;Bing Wang;W. Chen
制备了一种新型“钢架”共晶结构的AlCoCrFeNi2. 1高熵合金，并对其显微组织、力学性能和缺口敏感性进行了表征。该合金具有由面心立方（FCC）相、L12相和B2相组成的独特的钢骨架共晶组织，具有高强度和高塑性。这种独特的共晶组织阻碍了位错的运动，延缓了裂纹的扩展。考虑到材料的缺口敏感性是其应用的关键，引入4种不同缺口半径的U形缺口，研究缺口敏感性及其对材料变形行为的影响。结果表明，AlCoCrFeNi2.1合金对缺口不敏感，缺口试样的拉伸性能比未缺口试样有所提高。
AlCoCrFeNi2.1high entropy alloy with a novel “steel-frame” eutectic microstructure was prepared and its microstructure, mechanical properties, and notch sensitivity were characterized. The alloy exhibits high strength and high ductility due to the unique steel framed eutectic microstructure that consists of face-centered-cubic (FCC) phase, L12phase and B2 phase. This unique eutectic microstructure hinders dislocation movements and postpones the crack propagation. Considering the notch sensitivity of materials is critical to its application, U-shaped notches with four different notch radii were introduced to investigate the notch sensitivity and their effects on the deformation behavior. The results show that AlCoCrFeNi2.1alloy is insensitive to the notch and the tensile properties of the notched specimens are improved compared to that of the un-notched counterpart.