Hsu Wei-Chen, Kao Wei-Pin, Yeh Jien-Wei, Tsai Che-Wei
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
High Entropy Materials Center, National Tsing Hua University, Hsinchu 30013, Taiwan.
Materials (Basel). 2022 Jan 19;15(3):751. doi: 10.3390/ma15030751.
Co-free body-centered cubic (bcc) high-entropy alloys (HEAs) are prepared, and the elevated mechanical property and corrosion property of the AlCrFeMnNiMo (x = 0 and 0.1) alloys are studied. The Vickers hardness (HV) of the as-homogenized state is between HV 350 and HV 400. Both alloys are provided with nano-scale NiAl-rich B2 precipitates which contribute to the strength at high-temperature. In addition, adding Mo in the present alloy strengthens by σ phase. AlCrFeMnNiMo exhibited outstanding tensile properties, with a yield strength of 413 MPa and ultimate tensile strength of 430 MPa in the elevated tensile test at 600 °C, which is better than that of AlCrFeMnNi alloy. Through potentiodynamic polarization testing in 0.5 M HSO solution and electrochemical impedance spectroscopy (EIS), it is shown that adding Mo can effectively reduce the corrosion current density and improve the impedance of passive film, since the passivation layer is formed and stable.
制备了无钴体心立方（bcc）高熵合金（HEAs），并研究了AlCrFeMnNiMo（x = 0和0.1）合金提高的力学性能和腐蚀性能。均匀化状态下的维氏硬度（HV）在HV 350至HV 400之间。两种合金均具有纳米级富NiAl的B2析出相，这有助于提高高温强度。此外，在本合金中添加Mo会通过σ相强化。AlCrFeMnNiMo表现出出色的拉伸性能，在600℃的高温拉伸试验中，屈服强度为413MPa，极限抗拉强度为430MPa，优于AlCrFeMnNi合金。通过在0.5M HSO溶液中的动电位极化测试和电化学阻抗谱（EIS）表明，添加Mo可以有效降低腐蚀电流密度并提高钝化膜的阻抗，因为形成了稳定的钝化层。
